end function on last host with inline srv6 option

[guimvmatos]

Hi, @skorpion17 @StefanoSalsano @cl4u2 @pierpaolo-loreti

I have four hosts with a srv6 inline route.
Host 1 (RAN) -> ip -6 route add fc00::4 encap seg6 mode inline segs fcf0:12::100,fcf0:23::6006 dev enp0s8
Host 2 (NVF1) -> ip -6 route add fcf0:12::100 encap seg6local action End dev enp0s8
Host 3 (NVF2) -> ip -6 route add fcf0:23::6006 encap seg6local action End dev enp0s8
Host 4 (UPF) -> ip -6 route add fc00::4 encap seg6local action ???

If i ping host 4 from host 1, this packet pass through host 2 and 3, and then stop at host 4 with segment left=0 and destination address = fc00::4, that is correct. But I dont know how to desencapsute this packet. .

Below, the complete settings.

#######################

host_1 (RAN)#####

#######################
ip link set dev lo up
ip -6 addr add fc00::1/64 dev enp0s8
ip link set dev enp0s8 up
ip -6 neigh add fc00::2 lladdr 00:00:00:00:00:02 nud permanent dev enp0s8
ip -6 neigh add fc00::3 lladdr 00:00:00:00:00:03 nud permanent dev enp0s8
ip -6 neigh add fc00::4 lladdr 00:00:00:00:00:04 nud permanent dev enp0s8
sudo sysctl -w net.ipv6.conf.all.seg6_require_hmac=-1
sudo sysctl -w net.ipv6.conf.all.accept_source_route=1
sudo sysctl -w net.ipv6.conf.all.forwarding=1
sudo sysctl -w net.ipv6.conf.enp0s8.seg6_require_hmac=-1
sudo sysctl -w net.ipv6.conf.enp0s8.seg6_enabled=1
sudo sysctl -p

ip -6 route add fcf0:12::100 via fc00::2
ip -6 route add fc00::4 encap seg6 mode inline segs fcf0:12::100,fcf0:23::6006 dev enp0s8

##################

host_2

##################
ip link set dev lo up
ip -6 addr add fc00::2/64 dev enp0s8
ip link set dev enp0s8 up
ip -6 neigh add fc00::1 lladdr 00:00:00:00:00:01 nud permanent dev enp0s8
ip -6 neigh add fc00::3 lladdr 00:00:00:00:00:03 nud permanent dev enp0s8
ip -6 neigh add fc00::4 lladdr 00:00:00:00:00:04 nud permanent dev enp0s8
sudo sysctl -w net.ipv6.conf.all.seg6_require_hmac=-1
sudo sysctl -w net.ipv6.conf.all.accept_source_route=1
sudo sysctl -w net.ipv6.conf.all.forwarding=1
sudo sysctl -w net.ipv6.conf.enp0s8.seg6_require_hmac=-1
sudo sysctl -w net.ipv6.conf.enp0s8.seg6_enabled=1
sudo sysctl -p
ip -6 route add fcf0:23::6006 via fc00::3
ip -6 route add fcf0:12::100 encap seg6local action End dev enp0s8

##################

host_3

##################
ip link set dev lo up
ip -6 addr add fc00::3/64 dev enp0s8
ip link set dev enp0s8 up
ip -6 neigh add fc00::1 lladdr 00:00:00:00:00:01 nud permanent dev enp0s8
ip -6 neigh add fc00::2 lladdr 00:00:00:00:00:02 nud permanent dev enp0s8
ip -6 neigh add fc00::4 lladdr 00:00:00:00:00:04 nud permanent dev enp0s8
sudo sysctl -w net.ipv6.conf.all.seg6_require_hmac=-1
sudo sysctl -w net.ipv6.conf.all.accept_source_route=1
sudo sysctl -w net.ipv6.conf.all.forwarding=1
sudo sysctl -w net.ipv6.conf.enp0s8.seg6_require_hmac=-1
sudo sysctl -w net.ipv6.conf.enp0s8.seg6_enabled=1
sudo sysctl -p
ip -6 route add fcf0:23::6006 encap seg6local action End dev enp0s8
ip6tables -t mangle -A POSTROUTING -p icmpv6 --icmpv6-type redirect -j DROP

##################

host_4

##################
ip link set dev lo up
ip -6 addr add fc00::4/64 dev enp0s8
ip link set dev enp0s8 up
ip -6 neigh add fc00::1 lladdr 00:00:00:00:00:01 nud permanent dev enp0s8
ip -6 neigh add fc00::2 lladdr 00:00:00:00:00:02 nud permanent dev enp0s8
ip -6 neigh add fc00::3 lladdr 00:00:00:00:00:03 nud permanent dev enp0s8
sudo sysctl -w net.ipv6.conf.all.seg6_require_hmac=-1
sudo sysctl -w net.ipv6.conf.all.accept_source_route=1
sudo sysctl -w net.ipv6.conf.all.forwarding=1
sudo sysctl -w net.ipv6.conf.enp0s8.seg6_require_hmac=-1
sudo sysctl -w net.ipv6.conf.enp0s8.seg6_enabled=1
sudo sysctl -p

ip -6 route add fc00::4 encap seg6local action ???