[net-next,0/2] net: allow dissecting/matching tunnel control flags

Message

Davide Caratti Jan. 31, 2024, 4:13 p.m. UTC

Ilya says: "for correct matching on decapsulated packets, we should match
on not only tunnel id and headers, but also on tunnel configuration flags
like TUNNEL_NO_CSUM and TUNNEL_DONT_FRAGMENT. This is done to distinguish
similar tunnels with slightly different configs. And it is important since
tunnel configuration is flow based, i.e. can be different for every packet,
even though the main tunnel port is the same."

 - patch 1 extends the kernel's flow dissector to extract these flags
   from the packet's tunnel metadata.
 - patch 2 extends TC flower tomatch on any combination of TUNNEL_NO_CSUM,
   TUNNEL_OAM and TUNNEL_DONT_FRAGMENT.

Davide Caratti (2):
  flow_dissector: add support for tunnel control flags
  net/sched: cls_flower: add support for matching tunnel control flags

 include/net/flow_dissector.h | 11 +++++++++
 include/uapi/linux/pkt_cls.h |  3 +++
 net/core/flow_dissector.c    | 13 ++++++++++-
 net/sched/cls_flower.c       | 45 ++++++++++++++++++++++++++++++++++++
 4 files changed, 71 insertions(+), 1 deletion(-)