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daemon: Do not require socketLB for BPF masq#33728

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Jul 15, 2024
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daemon: Do not require socketLB for BPF masq#33728
brb merged 1 commit intomainfrom
pr/brb/bpf-masq-no-socket-lb

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@brb brb commented Jul 11, 2024 •
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Previously, we required socketLB to be enabled in order for BPF masquerade to properly function. The reasoning was outlined in [1] and [2].

As pointed by Julian Wiedmann, [3] resolved the following NAT reply issue:

    On the remote node, the reply (dst=the client node IP) gets
    masqueraded by the BPF-masq feature, because we masquerade pod ->
    remote host IP in the tunnel mode (see comment in the
    "snat_v4_needed()" for the reason), and currently we don't consult
    the CT map to see whether a packet is reply.

Thus, we can remove the check.

[1]: #15437
[2]: 50e59c3
[3]: #17168

Fix #15437
Fix #12699

@maintainer-s-little-helper maintainer-s-little-helper Bot added the dont-merge/needs-release-note-label The author needs to describe the release impact of these changes. label Jul 11, 2024
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brb commented Jul 11, 2024

/ci-e2e

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brb commented Jul 11, 2024

/ci-e2e

@brb brb force-pushed the pr/brb/bpf-masq-no-socket-lb branch from b85338b to 01e4049 Compare July 11, 2024 13:16
@brb brb added release-note/misc This PR makes changes that have no direct user impact. needs-backport/1.16 labels Jul 11, 2024
@maintainer-s-little-helper maintainer-s-little-helper Bot removed the dont-merge/needs-release-note-label The author needs to describe the release impact of these changes. label Jul 11, 2024
@brb brb changed the title WIP: bpf masq w/o socket LB daemon: Do not require socketLB for BPF masq Jul 11, 2024
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brb commented Jul 11, 2024

/ci-e2e

@brb
daemon: Do not require socketLB for BPF masq
a45c5de 
Previously, we required socketLB to be enabled in order for BPF
masquerade to properly function. The reasoning was outlined in [1] and
[2].

As pointed by Julian Wiedmann, [3] resolved the following NAT reply
issue:

    On the remote node, the reply (dst=the client node IP) gets
    masqueraded by the BPF-masq feature, because we masquerade pod ->
    remote host IP in the tunnel mode (see comment in the
    "snat_v4_needed()" for the reason), and currently we don't consult
    the CT map to see whether a packet is reply.

Thus, we can remove the check.

[1]: #15437
[2]: 50e59c3
[3]: #17168

Signed-off-by: Martynas Pumputis <m@lambda.lt>
@brb brb force-pushed the pr/brb/bpf-masq-no-socket-lb branch from 01e4049 to a45c5de Compare July 11, 2024 14:15
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brb commented Jul 11, 2024

/ci-e2e

@brb brb requested a review from julianwiedmann July 11, 2024 14:56
@brb brb marked this pull request as ready for review July 11, 2024 14:56
@brb brb requested review from a team as code owners July 11, 2024 14:56
@brb brb requested review from ldelossa and viktor-kurchenko July 11, 2024 14:56
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brb commented Jul 11, 2024

/test

@julianwiedmann julianwiedmann added area/datapath Impacts bpf/ or low-level forwarding details, including map management and monitor messages. feature/snat Relates to SNAT or Masquerading of traffic feature/socket-lb Impacts the Socket-LB part of Cilium's kube-proxy replacement. labels Jul 11, 2024
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julianwiedmann approved these changes Jul 11, 2024
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Thank you! Let's see if the reasoning still holds true ...

@brb brb enabled auto-merge July 11, 2024 17:12
ldelossa
ldelossa approved these changes Jul 15, 2024
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Review the history of this issue.
Change LGTM.

@brb brb added this pull request to the merge queue Jul 15, 2024
@maintainer-s-little-helper maintainer-s-little-helper Bot added the ready-to-merge This PR has passed all tests and received consensus from code owners to merge. label Jul 15, 2024
Merged via the queue into main with commit 3de8537 Jul 15, 2024
@brb brb deleted the pr/brb/bpf-masq-no-socket-lb branch July 15, 2024 14:42
@sayboras sayboras mentioned this pull request Jul 16, 2024
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@github-actions github-actions Bot added backport-done/1.16 The backport for Cilium 1.16.x for this PR is done. and removed backport-pending/1.16 labels Jul 16, 2024
@julianwiedmann julianwiedmann mentioned this pull request Jul 16, 2024
Closed
julianwiedmann added a commit to julianwiedmann/cilium that referenced this pull request Jul 16, 2024
@julianwiedmann
daemon: clean up an outdated comment re BPF masq needing SocketLB
5cda442 
This was addressed in cilium#33728.

Signed-off-by: Julian Wiedmann <jwi@isovalent.com>
@julianwiedmann julianwiedmann mentioned this pull request Jul 17, 2024
Merged
github-merge-queue Bot pushed a commit that referenced this pull request Jul 18, 2024
@julianwiedmann
daemon: clean up an outdated comment re BPF masq needing SocketLB
51ad510 
This was addressed in #33728.

Signed-off-by: Julian Wiedmann <jwi@isovalent.com>
@joestringer joestringer mentioned this pull request Jul 24, 2024
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area/datapath Impacts bpf/ or low-level forwarding details, including map management and monitor messages. backport-done/1.16 The backport for Cilium 1.16.x for this PR is done. feature/snat Relates to SNAT or Masquerading of traffic feature/socket-lb Impacts the Socket-LB part of Cilium's kube-proxy replacement. ready-to-merge This PR has passed all tests and received consensus from code owners to merge. release-note/misc This PR makes changes that have no direct user impact.

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