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This patch avoids learning non-unicast targets in the vxlan FDB. They are non-unicast and thus should be sent to the broadcast-IPv6 instead of a unicast address Link: https://lore.kernel.org/netdev/15ee0cc7-9252-466b-8ce7-5225d605dde8@david-bauer.net/ Link: https://github.com/freifunk-gluon/gluon/issues/3191 Signed-off-by: David Bauer <mail@david-bauer.net>
31 lines
1.1 KiB
Diff
31 lines
1.1 KiB
Diff
From 3f1a227cb071f65f6ecc4db9f399649869735a7c Mon Sep 17 00:00:00 2001
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From: David Bauer <mail@david-bauer.net>
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Date: Sat, 17 Feb 2024 22:34:59 +0100
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Subject: [PATCH] net vxlan: don't learn non-unicast L2 destinations
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This patch avoids learning non-unicast targets in the vxlan FDB.
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They are non-unicast and thus should be sent to the broadcast-IPv6
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instead of a unicast address.
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Link: https://lore.kernel.org/netdev/15ee0cc7-9252-466b-8ce7-5225d605dde8@david-bauer.net/
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Link: https://github.com/freifunk-gluon/gluon/issues/3191
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Signed-off-by: David Bauer <mail@david-bauer.net>
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---
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drivers/net/vxlan.c | 4 ++++
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1 file changed, 4 insertions(+)
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--- a/drivers/net/vxlan/vxlan_core.c
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+++ b/drivers/net/vxlan/vxlan_core.c
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@@ -1493,6 +1493,10 @@ static bool vxlan_snoop(struct net_devic
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struct vxlan_fdb *f;
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u32 ifindex = 0;
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+ /* Don't learn broadcast packets */
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+ if (is_multicast_ether_addr(src_mac) || is_zero_ether_addr(src_mac))
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+ return false;
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+
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#if IS_ENABLED(CONFIG_IPV6)
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if (src_ip->sa.sa_family == AF_INET6 &&
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(ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
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