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Date: Thu, 26 Dec 2019 12:13:37 +0100
From: "Daniel Kolesa" <>
To: "David Miller" <>,,
Subject: Re: Re: [PATCH] uapi: Prevent redefinition of struct iphdr

On Thu, Dec 26, 2019, at 04:49, David Miller wrote:
> From: Rich Felker <>
> Date: Wed, 25 Dec 2019 20:05:15 -0500
> > On Wed, Dec 25, 2019 at 04:34:11PM -0800, David Miller wrote:
> >> I find it really strange that this, therefore, only happens for musl
> >> and we haven't had thousands of reports of this conflict with glibc
> >> over the years.
> > 
> > It's possible that there's software that's including just one of the
> > headers conditional on __GLIBC__, and including both otherwise, or
> > something like that. Arguably this should be considered unsupported
> > usage; there are plenty of headers where that doesn't work and
> > shouldn't be expected to.
> I don't buy that, this is waaaaaay too common a header to use.

In case of net-tools, only <linux/ip.h> is included, and never <netinet/ip.h> directly. Chances are in musl the indirect include tree happens to be different and conflicting, while in glibc it is not.

> Please investigate.


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