netdev - Re: [PATCH]

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Message-ID: <1380210799.3165.187.camel@edumazet-glaptop>
Date:	Thu, 26 Sep 2013 08:53:19 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Nikolay Aleksandrov <nikolay@...hat.com>
Cc:	Daniel Borkmann <dborkman@...hat.com>, netdev@...r.kernel.org,
	davem@...emloft.net, andy@...yhouse.net, fubar@...ibm.com,
	vfalico@...hat.com
Subject: Re: [PATCH]

On Thu, 2013-09-26 at 17:40 +0200, Nikolay Aleksandrov wrote:
> > 
> 1 question, I might be missing something but proto_ports_offset() gets the SPI
> with that 4 byte offset as is written in the comments, in every other case
> proto_ports_offset() is 0, so why would we want the SPI in the ->ports field ?
> And even then isn't it supposed to be 16 bits (2 bytes) and not 4, since we need
> to pass over "next header" (8 bits) and length (8 bits) ?

struct ip_auth_hdr {
        __u8  nexthdr;
        __u8  hdrlen;           /* This one is measured in 32 bit units! */
        __be16 reserved;
        __be32 spi;
        __be32 seq_no;          /* Sequence number */
        __u8  auth_data[0];     /* Variable len but >=4. Mind the 64 bit alignment! */
};

offsetof(spi, struct ...) = 4



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