[PATCH bpf-next v3 0/2] bpf,net: add missing custom syncookie statistics and add selftest

[Jiayuan Chen <jiayuan.chen@linux.dev>]

v2 was reviewed on net-next; per Martin's request the series is
re-targeted at the bpf-next tree's net branch (bpf-next/net) so
both patches can land together via the BPF tree (the selftest
touches BPF selftest helpers). No code changes vs. v2 beyond the
nits below.

For context, the series accounts BPF custom syncookie validation
in the LINUX_MIB_SYNCOOKIES{RECV,FAILED} SNMP counters (with a few
related cleanups in the cookie_bpf_* config guards), and adds a
selftest that verifies the counters move as expected.

v2: https://lore.kernel.org/netdev/20260411013211.225834-1-jiayuan.chen@linux.dev/T/#m9c0ccc349fbed908e2cf34ce34ebd45b6f747b07

---

Changelog
=========
v2 -> v3:
  - Retarget bpf-next/net (Martin).
  - 1/2: fix typo and rationale in commit message — the removed
    guard is CONFIG_BPF, not CONFIG_BPF_SYSCALL, and the reason is
    that the guard is a no-op under CONFIG_NET, not a build-failure
    risk (Martin).
  - 2/2: keep reverse xmas tree order in create_connection()
    (Kuniyuki).
  - Add Reviewed-by from Kuniyuki on both patches.

Jiayuan Chen (2):
  net: add missing syncookie statistics for BPF custom syncookies
  selftests/bpf: verify syncookie statistics in tcp_custom_syncookie

 include/net/tcp.h                             |  7 +++---
 net/ipv4/syncookies.c                         | 10 ++++++---
 net/ipv6/syncookies.c                         |  2 +-
 tools/testing/selftests/bpf/network_helpers.c | 22 +++++++++++++++++++
 tools/testing/selftests/bpf/network_helpers.h |  1 +
 .../bpf/prog_tests/tcp_custom_syncookie.c     | 20 +++++++++++++++++
 6 files changed, 54 insertions(+), 8 deletions(-)

-- 
2.43.0