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authorMasashi Honma <masashi.honma@gmail.com>2017-03-16 04:57:18 +0300
committerJohannes Berg <johannes.berg@intel.com>2017-03-29 11:29:09 +0300
commited92a9b5d4aaea4a4346db3ab520e8a631f734fd (patch)
treeb9ba9224d9086166571b8a68bc4fe11609e85b6e /net/mac80211
parentb6ecfd469e82886308b44bf715d48fbe7b19ad4c (diff)
downloadlinux-ed92a9b5d4aaea4a4346db3ab520e8a631f734fd.tar.xz
mac80211: mesh: drop new node with weak power
On some practical cases, it is useful to drop new node in the distance. Because mesh metric is calculated with hop count and without RSSI information, a node far from local peer and near to destination node could be used as best path. For example, the nodes are located in linear. Distance of 0 - 1 and 1 - 2 and 2 - 3 is 20meters. 0 to 3 signal is very weak. 0 --- 1 --- 2 --- 3 Though most robust path from 0 to 3 is 0 -> 1 -> 2 -> 3, unfortunately, node 0 could recognize node 3 as neighbor. Then node 3 could be next of node 0. This patch aims to avoid such a case. [Johannes:] Dropping the node entirely isn't ideal, but at least with encryption there will be a limit on # of keys the hardware can deal with, and there might also be a limit on the number of stations it supports. Signed-off-by: Masashi Honma <masashi.honma@gmail.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211')
-rw-r--r--net/mac80211/mesh.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c
index 6e7b6a07b7d5..281d834c7548 100644
--- a/net/mac80211/mesh.c
+++ b/net/mac80211/mesh.c
@@ -1100,8 +1100,14 @@ static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
return;
- if (mesh_matches_local(sdata, &elems))
- mesh_neighbour_update(sdata, mgmt->sa, &elems);
+ if (mesh_matches_local(sdata, &elems)) {
+ mpl_dbg(sdata, "rssi_threshold=%d,rx_status->signal=%d\n",
+ sdata->u.mesh.mshcfg.rssi_threshold, rx_status->signal);
+ if (!sdata->u.mesh.user_mpm ||
+ sdata->u.mesh.mshcfg.rssi_threshold == 0 ||
+ sdata->u.mesh.mshcfg.rssi_threshold < rx_status->signal)
+ mesh_neighbour_update(sdata, mgmt->sa, &elems);
+ }
if (ifmsh->sync_ops)
ifmsh->sync_ops->rx_bcn_presp(sdata,