Add 'mpls()' function to create MPLS header with fields:
Label, TClass, Bottom-Stack, TTL
By default EtherType is set to MPLS Unicast (0x8847).
Added man changes as well. By default bottom-stack (S-flag) is
set to 1 but resets to 0 after the lower MPLS was added. As future
extensions for 'mpls()' function might be:
1) Allow to mark MPLS header as multicast via setting EtherType to 0x8848
like:
mpls(mc) or mpls(mcast)
2) Add parameters for specific label values:
mpls(alert)
Also fixed issue with incorrect field bit-masking which uses only
OR to merge specified & original value which does not allow
to set 0 value, now the original value is AND-ed with reversed field mask, so
the required bits are reset to 0s in original value and then OR-ed with
specified value. The problem actually apperead while setting S-flag to 0
when the lower MPLS header was added.
Small additional fixes in trafgen.8 file like:
1) Changed ip -> ipv4 in UDP Echo example
2) Add line break for VLAN section in sentence about EtherType.
Vadim Kochan (4):
trafgen: proto: Fix bad field masking
trafgen: l2: Add MPLS header generation
trafgen: parser: Add syntax for MPLS header creating
trafgen: man: Add description for 'mpls()' function
trafgen.8 | 29 +++++++++++++++++++++++++++--
trafgen_l2.c | 32 ++++++++++++++++++++++++++++++++
trafgen_l2.h | 7 +++++++
trafgen_lexer.l | 6 ++++++
trafgen_parser.y | 29 ++++++++++++++++++++++++++++-
trafgen_proto.c | 24 ++++++++++++++++++++----
trafgen_proto.h | 1 +
7 files changed, 121 insertions(+), 7 deletions(-)
--
2.6.3
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