Extend field expression with the following syntax:

    <field>[<index>] | <field>[<index>:<length>]

which allows to specify value or function at specified offset relative to the
field's offset within a header.

The trick to implement this was to use copies of proto_field instances
in the packet_dyn->fields array which allows to specify different functions
for the same field and with different offsets.

It was needed to change IPv6 address rule parsing to more strict rule to allow
parse <field>[<index>:<len>] syntax.

    Change commit messages and man file that field offset expression
    is used with function expression, and added validation for it in trafgen 

Vadim Kochan (7):
  trafgen: parser: Rename field_expr -> field_value_expr rule
  trafgen: proto: Change __proto_field_set_bytes(...) to take field
  trafgen: proto: Rename proto_field_xxx -> proto_hdr_field_xxx
  trafgen: proto: Add proto field only setters/getters
  trafgen: parser: Parse IPv6 address by strict match pattern
  trafgen: parser: Allow to set function at field offset
  man: trafgen: Add short description about field offset using

 trafgen.8        |  25 ++++++
 trafgen_l2.c     |  44 +++++------
 trafgen_l3.c     |  24 +++---
 trafgen_l4.c     |  28 +++----
 trafgen_lexer.l  |  51 +++++++++++-
 trafgen_parser.y | 236 ++++++++++++++++++++++++++++++++++++-------------------
 trafgen_proto.c  | 217 +++++++++++++++++++++++++++++++-------------------
 trafgen_proto.h  |  64 +++++++++------
 8 files changed, 450 insertions(+), 239 deletions(-)


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