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authorGuillaume Nault <gnault@redhat.com>2021-06-25 15:33:13 +0200
committerDavid S. Miller <davem@davemloft.net>2021-06-28 12:44:17 -0700
commitaab1e898c26c3e4289c62b6d6482948672fab939 (patch)
tree85943a4efc11e6f1216ac9662e5cafd089dae608 /drivers/char
parent730eed2772e740c30229d03e3d578cc00a5ae304 (diff)
gre: let mac_header point to outer header only when necessary
Commit e271c7b4420d ("gre: do not keep the GRE header around in collect medata mode") did reset the mac_header for the collect_md case. Let's extend this behaviour to classical gre devices as well. ipgre_header_parse() seems to be the only case that requires mac_header to point to the outer header. We can detect this case accurately by checking ->header_ops. For all other cases, we can reset mac_header. This allows to push an Ethernet header to ipgre packets and redirect them to an Ethernet device: $ tc filter add dev gre0 ingress matchall \ action vlan push_eth dst_mac 00:00:5e:00:53:01 \ src_mac 00:00:5e:00:53:00 \ action mirred egress redirect dev eth0 Before this patch, this worked only for collect_md gre devices. Now this works for regular gre devices as well. Only the special case of gre devices that use ipgre_header_ops isn't supported. Signed-off-by: Guillaume Nault <gnault@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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