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Currently collect_md gre tunnel will store the tunnel info(metadata_dst)
to skb_dst.
And now the non-tun-dst gre tunnel already can add tunnel header through
lwtunnel.
When received a arp_request on the non-tun-dst gre tunnel. The packet of
arp response will send through the non-tun-dst tunnel without tunnel info
which will lead the arp response packet to be dropped.
If the non-tun-dst gre tunnel also store the tunnel info as metadata_dst,
The arp response packet will set the releted tunnel info in the
iptunnel_metadata_reply.
The following is the test script:
ip netns add cl
ip l add dev vethc type veth peer name eth0 netns cl
ifconfig vethc 172.168.0.7/24 up
ip l add dev tun1000 type gretap key 1000
ip link add user1000 type vrf table 1
ip l set user1000 up
ip l set dev tun1000 master user1000
ifconfig tun1000 10.0.1.1/24 up
ip netns exec cl ifconfig eth0 172.168.0.17/24 up
ip netns exec cl ip l add dev tun type gretap local 172.168.0.17 remote 172.168.0.7 key 1000
ip netns exec cl ifconfig tun 10.0.1.7/24 up
ip r r 10.0.1.7 encap ip id 1000 dst 172.168.0.17 key dev tun1000 table 1
With this patch
ip netns exec cl ping 10.0.1.1 can success
Signed-off-by: wenxu <wenxu@ucloud.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
c0d59da795