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Re: kern/125003: incorrect EtherIP header format.



The following reply was made to PR kern/125003; it has been noted by GNATS.

From: Hiroki Sato <hrs_(_at_)_FreeBSD_(_dot_)_org>
To: shino_(_at_)_fornext_(_dot_)_org
Cc: freebsd-bugs_(_at_)_FreeBSD_(_dot_)_org, bug-followup_(_at_)_FreeBSD_(_dot_)_org
Subject: Re: kern/125003: incorrect EtherIP header format.
Date: Sun, 29 Jun 2008 01:35:12 +0900 (JST)

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 Shunsuke SHINOMIYA <shino_(_at_)_fornext_(_dot_)_org> wrote
   in <200806270610_(_dot_)_m5R6A3hR060682_(_at_)_freefall_(_dot_)_freebsd_(_dot_)_org>:
 
 sh>  =46rom RFC3378
 sh>  > In summary, the EtherIP Header has two fields:
 sh>  >=20
 sh>  >       Bits 0-3:  Protocol version
 sh>  >       Bits 4-15: Reserved for future use
 sh>  >=20
 sh>  >         0   1   2   3   4   5   6   7   8   9  10  11  12  13  14  15
 sh>  >      +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
 sh>  >      |               |                                               |
 sh>  >      |    VERSION    |                   RESERVED                    |
 sh>  >      |               |                                               |
 sh>  >      +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
 sh>  >=20
 sh>  >                  Figure 2: EtherIP Header Format (in bits)
 sh>  >=20
 sh>
 sh>  , first octet(bit 0,MSB to 7) consists of VERSION and a part of RESERVED.
 sh>  And VERSION is high 4 bits of the octet.
 sh>  Am I misunderstanding this?
 
  The VERSION is in bit 0-3 and LSB in this diagram is left.  As Andrew
  also explained, these are the reasons why ETHERIP_VER_VERS_MASK is
  defined as 0x0f.
 
  Do you really have interoperability problem?  If so, please let us
  know more detail information about it first.
 
 --
 | Hiroki SATO
 
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