[PATCH bpf-next v2 0/2] Add more bpf_*_ct_lookup() selftests

[Daniel Xu]

This patchset adds more bpf_*_ct_lookup() selftests. The goal is to test
interaction with netfilter subsystem as well as reading from `struct
nf_conn`. The first is important when migrating legacy systems towards
bpf. The latter is important in general to take full advantage of
connection tracking.

I'll follow this patchset up with support for writing to `struct nf_conn`.

This change will require two changes to BPF CI kconfig:

* CONFIG_NF_CONNTRACK_MARK=y
* CONFIG_NETFILTER_XT_CONNMARK=y

I can put up the PR if this patchset looks good.

Past discussion:
- v1: https://lore.kernel.org/bpf/cover.1659209738.git.dxu@xxxxxxxxx/

Changes since v1:
- Reword commit message / cover letter to not mention connmark writing

Daniel Xu (2):
  selftests/bpf: Add existing connection bpf_*_ct_lookup() test
  selftests/bpf: Add connmark read test

 .../testing/selftests/bpf/prog_tests/bpf_nf.c | 60 +++++++++++++++++++
 .../testing/selftests/bpf/progs/test_bpf_nf.c | 21 +++++++
 2 files changed, 81 insertions(+)

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2.37.1