Re: [Roll] [roll] #8: DIO Option Length

[Michael Richardson <mcr at sandelman.ca>]

>>>>> "Julien" == Julien Abeille <(jabeille)" <jabeille at cisco.com>> writes:
    Julien> Some suboptions should be moved to options (separate thread,
    Julien> DIO base option is not optional hence should not be an
    Julien> option. Makes sense?).

    Julien> General related question: for the cases where we need
    Julien> suboptions (metric container), do we want suboptions to be 8
    Julien> bytes aligned? Or only options should be 8 bytes aligned?

  Our options and suboptions should be identical.
  We should also not re-invent the wheel.  It should either replicate
the IPv6 extension header (if that's what we want), or should replicate
another protocol, e.g. radius(RFC2865):

    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |     Code      |  Identifier   |            Length             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   |                         Authenticator                         |
   |                                                               |
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |  Attributes ...
   +-+-+-+-+-+-+-+-+-+-+-+-+-

....

   A summary of the Attribute format is shown below.  The fields are
   transmitted from left to right.

    0                   1                   2
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
   |     Type      |    Length     |  Value ...
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-

-- 
]       He who is tired of Weird Al is tired of life!           |  firewalls  [
]   Michael Richardson, Sandelman Software Works, Ottawa, ON    |net architect[
] mcr at sandelman.ottawa.on.ca http://www.sandelman.ottawa.on.ca/ |device driver[
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