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Date:	Mon, 19 Oct 2009 22:56:52 +0200
From:	Torsten Schmidt <>
To:	Eric Dumazet <>
Cc:	Linux Netdev List <>
Subject: Re: [PATCH] IPv4: skip loopback checksums in ip_rcv()

Eric Dumazet wrotes:
> This is bogus IMHO.
> One bit could be corrupted in iph, and ntohl(iph->daddr) becomes 0x7fxxyyzz,
> we then accept a bogus frame. This is a RFC violation.
> This also slows down non loopback devices, adding an extra test.
> ip_fast_csum() is really fast (about 16 instructions).

Yes, you are right. So it would be better to only skip csum if *dev is 
our loopback interface ? Right ?
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