From: Masashi Honma Date: Thu, 16 Mar 2017 01:57:18 +0000 (+0900) Subject: mac80211: mesh: drop new node with weak power X-Git-Tag: v4.12-rc1~129^2~155^2~18 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ed92a9b5d4aaea4a4346db3ab520e8a631f734fd;p=platform%2Fkernel%2Flinux-exynos.git 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 Signed-off-by: Johannes Berg --- diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c index 6e7b6a0..281d834 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,