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References: <20210928031938.17902-1-xiyou.wangcong@gmail.com>
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From:   "Jason A. Donenfeld" <Jason@zx2c4.com>
Date:   Mon, 27 Sep 2021 21:22:44 -0600
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Subject: Re: [Patch net] wireguard: preserve skb->mark on ingress side
To:     Cong Wang <xiyou.wangcong@gmail.com>
Cc:     Netdev <netdev@vger.kernel.org>,
        WireGuard mailing list <wireguard@lists.zx2c4.com>,
        Cong Wang <cong.wang@bytedance.com>,
        Peilin Ye <peilin.ye@bytedance.com>
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Hi Cong,

I'm not so sure this makes sense, as the inner packet is in fact
totally different. If you want to distinguish the ingress interface,
can't you just use `iptables -i wg0` or `ip rule add ... iif wg0`?

Jason