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generic vxlan: don't learn non-unicast L2 destinations

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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>
This commit is contained in:
David Bauer 2024-02-17 22:37:05 +01:00
parent 6f23e92e1c
commit 0985262fd0
2 changed files with 60 additions and 0 deletions
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30
target/linux/generic/pending-5.15/779-net-vxlan-don-t-learn-non-unicast-L2-destinations.patch Normal file
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@ -0,0 +1,30 @@
From 3f1a227cb071f65f6ecc4db9f399649869735a7c Mon Sep 17 00:00:00 2001
From: David Bauer <mail@david-bauer.net>
Date: Sat, 17 Feb 2024 22:34:59 +0100
Subject: [PATCH] net vxlan: don't learn non-unicast L2 destinations
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>
---
drivers/net/vxlan.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/net/vxlan/vxlan_core.c
+++ b/drivers/net/vxlan/vxlan_core.c
@@ -1493,6 +1493,10 @@ static bool vxlan_snoop(struct net_devic
struct vxlan_fdb *f;
u32 ifindex = 0;
+ /* Don't learn broadcast packets */
+ if (is_multicast_ether_addr(src_mac) || is_zero_ether_addr(src_mac))
+ return false;
+
#if IS_ENABLED(CONFIG_IPV6)
if (src_ip->sa.sa_family == AF_INET6 &&
(ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))

30
target/linux/generic/pending-6.1/779-net-vxlan-don-t-learn-non-unicast-L2-destinations.patch Normal file
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@ -0,0 +1,30 @@
From 3f1a227cb071f65f6ecc4db9f399649869735a7c Mon Sep 17 00:00:00 2001
From: David Bauer <mail@david-bauer.net>
Date: Sat, 17 Feb 2024 22:34:59 +0100
Subject: [PATCH] net vxlan: don't learn non-unicast L2 destinations
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>
---
drivers/net/vxlan.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/net/vxlan/vxlan_core.c
+++ b/drivers/net/vxlan/vxlan_core.c
@@ -1493,6 +1493,10 @@ static bool vxlan_snoop(struct net_devic
struct vxlan_fdb *f;
u32 ifindex = 0;
+ /* Don't learn broadcast packets */
+ if (is_multicast_ether_addr(src_mac) || is_zero_ether_addr(src_mac))
+ return false;
+
#if IS_ENABLED(CONFIG_IPV6)
if (src_ip->sa.sa_family == AF_INET6 &&
(ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))