in_cksum() for ip packets with multiple mbufs

[Simon 'corecode' Schubert]

kamal kc wrote:
>    -  final thing does this makes any difference
>      (calling the htons() twice):
> 
>       ip->ip_id=htons(ip->ip_id);
>       ip->ip_id=htons(ip->ip_id);

on little endian machines: yes.  on big endian machines:  no.  So don't 
do it. :)

freebsd has several fields of the ip headerin host byte order to speed 
up access.  they get converted to network byte order at a very late 
stage of the ip output path.

cheers
   simon

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