Merge tag 'for-netdev' of https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf

Daniel Borkmann says:

====================
pull-request: bpf 2024-01-18

We've added 10 non-merge commits during the last 5 day(s) which contain
a total of 12 files changed, 806 insertions(+), 51 deletions(-).

The main changes are:

1) Fix an issue in bpf_iter_udp under backward progress which prevents
   user space process from finishing iteration, from Martin KaFai Lau.

2) Fix BPF verifier to reject variable offset alu on registers with a type
   of PTR_TO_FLOW_KEYS to prevent oob access, from Hao Sun.

3) Follow up fixes for kernel- and libbpf-side logic around handling
   arg:ctx tagged arguments of BPF global subprogs, from Andrii Nakryiko.

* tag 'for-netdev' of https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf:
  libbpf: warn on unexpected __arg_ctx type when rewriting BTF
  selftests/bpf: add tests confirming type logic in kernel for __arg_ctx
  bpf: enforce types for __arg_ctx-tagged arguments in global subprogs
  bpf: extract bpf_ctx_convert_map logic and make it more reusable
  libbpf: feature-detect arg:ctx tag support in kernel
  selftests/bpf: Add test for alu on PTR_TO_FLOW_KEYS
  bpf: Reject variable offset alu on PTR_TO_FLOW_KEYS
  selftests/bpf: Test udp and tcp iter batching
  bpf: Avoid iter->offset making backward progress in bpf_iter_udp
  bpf: iter_udp: Retry with a larger batch size without going back to the previous bucket
====================

Link: https://lore.kernel.org/r/20240118153936.11769-1-daniel@iogearbox.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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