Commit 126e7557 authored Jun 19, 2016 by Jouni Malinen Committed by Johannes Berg Jun 28, 2016

mac80211: Fix mesh estab_plinks counting in STA removal case



If a user space program (e.g., wpa_supplicant) deletes a STA entry that
is currently in NL80211_PLINK_ESTAB state, the number of established
plinks counter was not decremented and this could result in rejecting
new plink establishment before really hitting the real maximum plink
limit. For !user_mpm case, this decrementation is handled by
mesh_plink_deactive().

Fix this by decrementing estab_plinks on STA deletion
(mesh_sta_cleanup() gets called from there) so that the counter has a
correct value and the Beacon frame advertisement in Mesh Configuration
element shows the proper value for capability to accept additional
peers.

Cc: stable@vger.kernel.org
Signed-off-by: Jouni Malinen <j@w1.fi>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>

parent 3d5fdff4

net/mac80211/mesh.c

+5 −2

Original line number	Diff line number	Diff line
		@@ -148,14 +148,17 @@ u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
		void mesh_sta_cleanup(struct sta_info *sta)
		{
		struct ieee80211_sub_if_data *sdata = sta->sdata;
		u32 changed;
		u32 changed = 0;

		/*
		* maybe userspace handles peer allocation and peering, but in either
		* case the beacon is still generated by the kernel and we might need
		* an update.
		*/
		changed = mesh_accept_plinks_update(sdata);
		if (sdata->u.mesh.user_mpm &&
		sta->mesh->plink_state == NL80211_PLINK_ESTAB)
		changed \|= mesh_plink_dec_estab_count(sdata);
		changed \|= mesh_accept_plinks_update(sdata);
		if (!sdata->u.mesh.user_mpm) {
		changed \|= mesh_plink_deactivate(sta);
		del_timer_sync(&sta->mesh->plink_timer);

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