It seems that the ip6_route_output(net, sk, fl6) kernel function ignores
the fl6.flowi6_oif parameter for the routing decision.
Is this intended?
Should it possible to force the output device for ipv6 routing just as
for ipv4?
Here the example shown with the ip command:
With ipv4, I'm able to get the default route when using oif (force the
output interface).
# ip r
default via 192.168.0.1 dev enp3s0 proto static
192.0.2.0/24 dev enp2s0 proto kernel scope link src 192.0.2.163
192.168.0.0/24 dev enp3s0 proto kernel scope link src 192.168.0.163
# ip r get 192.0.2.10
192.0.2.10 dev enp2s0 src 192.0.2.163
cache
# ip r get 192.0.2.10 oif enp3s0
192.0.2.10 via 192.168.0.1 dev enp3s0 src 192.168.0.163
cache
With ipv6, ip -6 route get always returns the specific route.
# ip -6 r
2001:db8:e2::1 dev enp2s0 proto kernel metric 256
2001:db8:e2::/64 dev enp2s0 metric 1024
2001:db8:e3::1 dev enp3s0 proto kernel metric 256
2001:db8:e3::/64 dev enp3s0 metric 1024
fe80::/64 dev enp3s0 proto kernel metric 256
default via 2001:db8:e3::255 dev enp3s0 metric 1024
ip -6 r get 2001:db8:e2::100
2001:db8:e2::100 from :: dev enp2s0 src 2001:db8:e3::1 metric 0
cache
# ip -6 r get 2001:db8:e2::100 oif enp3s0
2001:db8:e2::100 from :: dev enp2s0 src 2001:db8:e3::1 metric 0
cache
The detailed problem is described here, because I got the problem
initially when trying a ipsec Host-2-Host connection with libreswan/klips.
https://bugs.libreswan.org/show_bug.cgi?id=237
Thanks
Wolfgang
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