MFC r226105:

MFC r226105:
  Add back the IP header length to the total packet length field on
  raw IP sockets.  It was deducted in ip_input() in preparation for
  protocols interested only in the payload.

  On raw sockets the IP header should be delivered as it at came in
  from the network except for the byte order swaps in some fields.

Approved by:	re (kib)

git-svn-id: svn://svn.freebsd.org/base/stable/9@226299 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f