netdev - Issue with ipv6 icmp reply after dnat over ipsec

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Message-ID: <CAAycz1m+AszZCS-1eaKZiAAXRUVSEE4a_Z3X3j4Rjyvmce4zvA@mail.gmail.com>
Date:   Sat, 25 Feb 2023 00:14:21 +0530
From:   Satyavani Namala <vani.namala@...il.com>
To:     netdev@...r.kernel.org
Subject: Issue with ipv6 icmp reply after dnat over ipsec

We are facing an issue while testing ICMP v6 (NAT) with ipsec tunnel,
where ping was not working , as policy is not matching (returning with
LINUX_MIB_XFRMINNOPOLS).

When we investigated and compared with IPv4 , it was found that,
nf_reset is happening before xfrm6_policy_check in case of IPV6
compared to IPV4 in which nf_reset is done after xfrm4_policy_check.

Due to nf_reset, skb->_nfct is  NULL and __xfrm_policy_check is returning error.

Can we know if there is any fix in this area, and why it’s different from IPv4.