[v1,bpf-next,0/2] BPF: support mark in bpf_fib_lookup

Message

Anton Protopopov March 22, 2024, 2:02 p.m. UTC

This patch series adds policy routing support in bpf_fib_lookup.
This is a useful functionality which was missing for a long time,
as without it some networking setups can't be implemented in BPF.
One example can be found here [1].

A while ago there was an attempt to add this functionality [2] by
Rumen Telbizov and David Ahern. I've completely refactored the code,
except that the changes to the struct bpf_fib_lookup were copy-pasted
from the original patch.

The first patch implements the functionality, the second patch adds
a few selftests.

  [1] https://github.com/cilium/cilium/pull/12770
  [2] https://lore.kernel.org/all/[e-mail]/

Anton Protopopov (2):
  bpf: add support for passing mark with bpf_fib_lookup
  selftests/bpf: Add BPF_FIB_LOOKUP_MARK tests

 include/uapi/linux/bpf.h                      |  20 ++-
 net/core/filter.c                             |  12 +-
 tools/include/uapi/linux/bpf.h                |  20 ++-
 .../selftests/bpf/prog_tests/fib_lookup.c     | 160 ++++++++++++++----
 4 files changed, 176 insertions(+), 36 deletions(-)