net: Preserve metadata on pskb_expand_head

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pskb_expand_head() copies headroom, including skb metadata, into the newly
allocated head, but then clears the metadata. As a result, metadata is lost
when BPF helpers trigger an skb head reallocation.

Let the skb metadata remain in the newly created copy of head.

Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://patch.msgid.link/20251105-skb-meta-rx-path-v4-2-5ceb08a9b37b@cloudflare.com

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Jakub Sitnicki 2025-11-05 21:19:39 +01:00 • committed by Martin KaFai Lau

parent 8989d328df

commit 290fc0be09

1 changed files with 4 additions and 2 deletions

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net/core/skbuff.c

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