ip6_tunnel: do not use dst6_mtu() in ip4ip6_err() and ip6erspan_tunnel_xmit()

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This is a minor performance / conceptual fix.

1) ip6erspan_tunnel_xmit()

  ERSPAN tunnel can mirror both IPv4 and IPv6 traffic, skb
  (the packet being mirrored) can be an IPv4 packet,
  and thus dst can be an IPv4 destination entry

  Use dst_mtu() which contains generic logic for both families.

2) ip4ip6_err()

  skb2 has been prepared as an IPv4 packet, and its destination
  is an IPv4 route.

  dst6_mtu() is optimized for IPv6 destinations and uses INDIRECT_CALL_1
  to call ip6_mtu() directly if the ops match.

  We should use dst4_mtu() instead.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://patch.msgid.link/20260609091337.2672441-1-edumazet@google.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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This commit is contained in:

Eric Dumazet 2026-06-09 09:13:37 +00:00 • committed by Paolo Abeni

parent 0ce346bf2f

commit 6e12a8894e

2 changed files with 2 additions and 2 deletions

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2

net/ipv6/ip6_gre.c

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2

net/ipv6/ip6_tunnel.c

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