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Date:   Sun, 24 Feb 2019 17:33:10 -0800 (PST)
From:   David Miller <>
Subject: Re: [PATCH] NETWORKING: avoid use IPCB in cipso_v4_error

From: Nazarov Sergey <>
Date: Fri, 22 Feb 2019 19:35:29 +0300

> I tried to analyze the cases of using icmp_send in kernel. It
> indirectly used by many protocols: ARP, IP, UDP, Netfilter, IPVS,
> IPIP, GRE over IP, CLIP, XFRM, CIPSOv4.  Different IP tunnels and
> XFRM operating directly over IP layer and if using own skb->cb data,
> having IP header data in front of it. CLIP uses icmp_send for
> packets from arp queue only.  So, If I right, only TCP layer moves
> IP header data and only CIPSOv4 operates on both IP and TCP layers
> now.


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