From: Martin KaFai Lau <martin.lau@kernel.org>
Date: Sat, 20 May 2023 00:45:47 +0000 (-0700)
Subject: Merge branch 'bpf: Add socket destroy capability'
X-Git-Tag: v6.5-rc1~163^2~215^2~14
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=18f558876ff0361e8ceb537cdf6fec8936ff6f72;p=thirdparty%2Fkernel%2Flinux.git

Merge branch 'bpf: Add socket destroy capability'

Aditi Ghag says:

====================

This patch set adds the capability to destroy sockets in BPF. We plan to
use the capability in Cilium to force client sockets to reconnect when
their remote load-balancing backends are deleted. The other use case is
on-the-fly policy enforcement where existing socket connections
prevented by policies need to be terminated.

The use cases, and more details around
the selected approach were presented at LPC 2022 -
https://lpc.events/event/16/contributions/1358/.
RFC discussion -
https://lore.kernel.org/netdev/CABG=zsBEh-P4NXk23eBJw7eajB5YJeRS7oPXnTAzs=yob4EMoQ@mail.gmail.com/T/#u.
v8 patch series -
https://lore.kernel.org/bpf/20230517175359.527917-1-aditi.ghag@isovalent.com/

v9 highlights:
Address review comments:
Martin:
- Rearranged the kfunc filter patch, and added the missing break
  statement.
- Squashed the extended selftest/bpf patch.
Yonghong:
- Revised commit message for patch 1.

(Below notes are same as v8 patch series that are still relevant. Refer to
earlier patch series versions for other notes.)
- I hit a snag while writing the kfunc where verifier complained about the
  `sock_common` type passed from TCP iterator. With kfuncs, there don't
  seem to be any options available to pass BTF type hints to the verifier
  (equivalent of `ARG_PTR_TO_BTF_ID_SOCK_COMMON`, as was the case with the
  helper).  As a result, I changed the argument type of the sock_destory
  kfunc to `sock_common`.
====================

Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
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18f558876ff0361e8ceb537cdf6fec8936ff6f72