From: YOSHIFUJI Hideaki / 吉藤英明 <yoshfuji@linux-ipv6.org>
Date: Wed, 09 Apr 2008 00:46:32 +0900 (JST)

quoted text
> We cannot rely on sizeof(struct ipv6_opt_hdr) when we are handling
> wire format, because it may not be 2 but 4 on some architectures.
> On such a architecture, the result can be different from what we
> actually expect.
> 
> Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

Please just mark the structure with "packed" attribute.

It is appropriate in this case, and there should be no cost
because members are 8-byte quantities.

Otherwise, mistakes are likely to be added in the future.
It is very reasonable to expect the structure size for
a networking header to match correctly.
 
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