linux-kernel - [PATCH 4.9 122/138] mac80211: Suppress NEW_PEER

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Message-Id: <20171128100554.434118630@linuxfoundation.org>
Date:   Tue, 28 Nov 2017 11:23:43 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Masashi Honma <masashi.honma@...il.com>,
        Johannes Berg <johannes.berg@...el.com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.9 122/138] mac80211: Suppress NEW_PEER_CANDIDATE event if no room

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Masashi Honma <masashi.honma@...il.com>


[ Upstream commit 11197d006bcfabf0173a7820a163fcaac420d10e ]

Previously, kernel sends NEW_PEER_CANDIDATE event to user land even if
the found peer does not have any room to accept other peer. This causes
continuous connection trials.

Signed-off-by: Masashi Honma <masashi.honma@...il.com>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/mac80211/mesh_plink.c |   14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

--- a/net/mac80211/mesh_plink.c
+++ b/net/mac80211/mesh_plink.c
@@ -505,12 +505,14 @@ mesh_sta_info_alloc(struct ieee80211_sub
 
 	/* Userspace handles station allocation */
 	if (sdata->u.mesh.user_mpm ||
-	    sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED)
-		cfg80211_notify_new_peer_candidate(sdata->dev, addr,
-						   elems->ie_start,
-						   elems->total_len,
-						   GFP_KERNEL);
-	else
+	    sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) {
+		if (mesh_peer_accepts_plinks(elems) &&
+		    mesh_plink_availables(sdata))
+			cfg80211_notify_new_peer_candidate(sdata->dev, addr,
+							   elems->ie_start,
+							   elems->total_len,
+							   GFP_KERNEL);
+	} else
 		sta = __mesh_sta_info_alloc(sdata, addr);
 
 	return sta;