net: Clear the dst when performing encap / decap

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Commit ba9db6f907 ("net: clear the dst when changing skb protocol")
added dst clearing when a BPF program changes the skb protocol
(e.g. IPv4 to IPv6). Since that was a fix we only cleared the dst when
the L3 protocol actually changes to keep it minimal. As suggested during
the discussion (see Link) encap or decap operation which wraps or unwraps
a same-protocol header may also render the existing dst incorrect - even
if that doesn't result in a crash, just the wrong route for the now-outermost
IP dst.

Make dropping dst unconditional for bpf_skb_change_proto() and all
L3 encap / decap ops.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/CANP3RGfRaYwve_xgxH6Tp2zenzKn2-DjZ9tg023WVzfdJF3p_w@mail.gmail.com
Link: https://patch.msgid.link/20260329180428.2657785-1-kuba@kernel.org

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Jakub Kicinski 2026-03-29 11:04:27 -07:00 • committed by Martin KaFai Lau

parent cf0d9080c6

commit 699f47e616

1 changed files with 27 additions and 23 deletions

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net/core/filter.c

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