From 4a26ea27000a574b1dc89831ffb4b1bc25b1d372 Mon Sep 17 00:00:00 2001 From: Petr Machata Date: Wed, 21 Nov 2018 08:02:37 +0000 Subject: [PATCH] vxlan: Don't override user-added entries with ext-learned ones When an external learning event collides with an user-added entry, the user-added entry shouldn't be taken over. Otherwise on an unlearn event the entry would be completely lost, even though the user added it by hand. Therefore skip update of FDB flags and state for these cases. This is in accordance with the bridge behavior. Signed-off-by: Petr Machata Signed-off-by: Ido Schimmel Signed-off-by: David S. Miller --- drivers/net/vxlan.c | 26 +++++++++++++++++--------- 1 file changed, 17 insertions(+), 9 deletions(-) diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c index 9171c1f42fe94..b50705a50686a 100644 --- a/drivers/net/vxlan.c +++ b/drivers/net/vxlan.c @@ -780,16 +780,24 @@ static int vxlan_fdb_update(struct vxlan_dev *vxlan, "lost race to create %pM\n", mac); return -EEXIST; } - if (f->state != state) { - f->state = state; - f->updated = jiffies; - notify = 1; - } - if (f->flags != fdb_flags) { - f->flags = fdb_flags; - f->updated = jiffies; - notify = 1; + + /* Do not allow an externally learned entry to take over an + * entry added by the user. + */ + if (!(fdb_flags & NTF_EXT_LEARNED) || + !(f->flags & NTF_VXLAN_ADDED_BY_USER)) { + if (f->state != state) { + f->state = state; + f->updated = jiffies; + notify = 1; + } + if (f->flags != fdb_flags) { + f->flags = fdb_flags; + f->updated = jiffies; + notify = 1; + } } + if ((flags & NLM_F_REPLACE)) { /* Only change unicasts */ if (!(is_multicast_ether_addr(f->eth_addr) || -- 2.39.5