ip6_finish_output2 change broke netfilter xt_TEE target

The change made in commit 6fd6ce20 (ipv6: Do not depend on rt->n in ip6_finish_output2) broke the xt_TEE target for IPv6 packets. Instead of using the nexthop provided in the --gateway option, ip6_finish_output2 is now performing neighbor solicitation for the original daddr in the copied skb.

Similar breakage occurred in IPv4, and was fixed (in 2ad5b9e4) by using the flag FLOWI_FLAG_KNOWN_NH. I can find no easy way to make use of that flag here. Reverting 6fd6ce20 makes TEE work again, but I am not clear on what problem that commit was attempting to solve. Yoshifuji?

Phil