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bpf: Clarify handling of mark and tstamp by redirect_peer

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When switching network namespaces with the bpf_redirect_peer helper, the
skb->mark and skb->tstamp fields are not zeroed out like they can be on
a typical netns switch. This patch clarifies that in the helper
description.

Signed-off-by: Paul Chaignon <paul.chaignon@gmail.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://patch.msgid.link/ccc86af26d43c5c0b776bcba2601b7479c0d46d0.1746460653.git.paul.chaignon@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Paul Chaignon
2025-05-05 21:58:39 +02:00
committed by Andrii Nakryiko
parent 346532d711
commit 9b06cd15e0
1 changed files with 3 additions and 0 deletions
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include/uapi/linux/bpf.h
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@@ -4972,6 +4972,9 @@ union bpf_attr {
* the netns switch takes place from ingress to ingress without
* going through the CPU's backlog queue.
*
* *skb*\ **->mark** and *skb*\ **->tstamp** are not cleared during
* the netns switch.
*
* The *flags* argument is reserved and must be 0. The helper is
* currently only supported for tc BPF program types at the
* ingress hook and for veth and netkit target device types. The