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[PATCH] ieee80211: Don't update network statistics from off-channel packets. 

This patch fixes a problem in the ieee80211 probe response and beacon
reception code that would use the packet statistics for a network even
if they were received on a channel other than that which the network
exists on.

This causes a problem in overlapping channels where, for example, a
strong AP on channel 2 could have its beacons received on channels 1 and
3, but at much lower signal levels.  If scanning was done sequentially,
this means the beacon received on channel 3 would update the AP's signal
level as being much lower than it really is, which subsequently could
cause that AP to be passed over and an alternate AP selected.

Signed-off-by: James Ketrenos <jketreno@linux.intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
wifi-calibration
James Ketrenos 2006-03-08 13:14:45 -06:00 committed by John W. Linville
parent 7c56789448
commit f44349f221
1 changed files with 13 additions and 1 deletions
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14
net/ieee80211/ieee80211_rx.c
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@ -1345,7 +1345,19 @@ static void update_network(struct ieee80211_network *dst,
ieee80211_network_reset(dst);
dst->ibss_dfs = src->ibss_dfs;
memcpy(&dst->stats, &src->stats, sizeof(struct ieee80211_rx_stats));
/* We only update the statistics if they were created by receiving
* the network information on the actual channel the network is on.
*
* This keeps beacons received on neighbor channels from bringing
* down the signal level of an AP. */
if (dst->channel == src->stats.received_channel)
memcpy(&dst->stats, &src->stats,
sizeof(struct ieee80211_rx_stats));
else
IEEE80211_DEBUG_SCAN("Network " MAC_FMT " info received "
"off channel (%d vs. %d)\n", MAC_ARG(src->bssid),
dst->channel, src->stats.received_channel);
dst->capability = src->capability;
memcpy(dst->rates, src->rates, src->rates_len);
dst->rates_len = src->rates_len;