linux-kernel - Re: [PATCH net-next 3/9] net: tcp: use kfree_skb_reason() for tcp_v6

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Date:   Wed, 16 Feb 2022 21:07:34 -0700
From:   David Ahern <dsahern@...nel.org>
To:     menglong8.dong@...il.com, kuba@...nel.org
Cc:     edumazet@...gle.com, davem@...emloft.net, rostedt@...dmis.org,
        mingo@...hat.com, yoshfuji@...ux-ipv6.org, ast@...nel.org,
        daniel@...earbox.net, hawk@...nel.org, john.fastabend@...il.com,
        imagedong@...cent.com, talalahmad@...gle.com,
        keescook@...omium.org, ilias.apalodimas@...aro.org, alobakin@...me,
        memxor@...il.com, atenart@...nel.org, bigeasy@...utronix.de,
        pabeni@...hat.com, linyunsheng@...wei.com, arnd@...db.de,
        yajun.deng@...ux.dev, roopa@...dia.com, willemb@...gle.com,
        vvs@...tuozzo.com, cong.wang@...edance.com,
        luiz.von.dentz@...el.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org, flyingpeng@...cent.com
Subject: Re: [PATCH net-next 3/9] net: tcp: use kfree_skb_reason() for
 tcp_v6_rcv()

On 2/15/22 8:54 PM, menglong8.dong@...il.com wrote:
> @@ -1779,13 +1789,17 @@ INDIRECT_CALLABLE_SCOPE int tcp_v6_rcv(struct sk_buff *skb)
>  	return ret ? -1 : 0;
>  
>  no_tcp_socket:
> -	if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
> +	drop_reason = SKB_DROP_REASON_NO_SOCKET;
> +	if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
> +		drop_reason = SKB_DROP_REASON_XFRM_POLICY;

same here. First failure takes precedence.