bridge: skip fdb add if the port shouldn't learn
Check in fdb_add_entry() if the source port should learn, similar check is used in br_fdb_update. Note that new fdb entries which are added manually or as local ones are still permitted. This patch has been tested by running traffic via a bridge port and switching the port's state, also by manually adding/removing entries from the bridge's fdb. Signed-off-by: Wilson Kok <wkok@cumulusnetworks.com> Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -736,6 +736,12 @@ static int fdb_add_entry(struct net_bridge_port *source, const __u8 *addr,
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struct net_bridge_fdb_entry *fdb;
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struct net_bridge_fdb_entry *fdb;
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bool modified = false;
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bool modified = false;
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/* If the port cannot learn allow only local and static entries */
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if (!(state & NUD_PERMANENT) && !(state & NUD_NOARP) &&
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!(source->state == BR_STATE_LEARNING ||
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source->state == BR_STATE_FORWARDING))
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return -EPERM;
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fdb = fdb_find(head, addr, vid);
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fdb = fdb_find(head, addr, vid);
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if (fdb == NULL) {
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if (fdb == NULL) {
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if (!(flags & NLM_F_CREATE))
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if (!(flags & NLM_F_CREATE))
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