netdev - Re: Issue with ipv6 icmp reply after dnat over ipsec

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Message-ID: <20230224185057.GJ26596@breakpoint.cc>
Date:   Fri, 24 Feb 2023 19:50:57 +0100
From:   Florian Westphal <fw@...len.de>
To:     Satyavani Namala <vani.namala@...il.com>
Cc:     netdev@...r.kernel.org
Subject: Re: Issue with ipv6 icmp reply after dnat over ipsec

Satyavani Namala <vani.namala@...il.com> wrote:
> 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.

Looks like a bug, can you submit a fix?