netlink: specs: fou: link the type attribute to the encap-type enum

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The spec defines encap-type (unspec / direct / gue), but no attribute
references it, so the definition exists only to emit FOU_ENCAP_* into
the uAPI header - while FOU_ATTR_TYPE is exactly that value space:
fou_create() switches on FOU_ENCAP_DIRECT / FOU_ENCAP_GUE and returns
-EINVAL for anything else. Python YNL could not accept or display the
names and the generated C exposed a raw __u8 setter.

The global policy entry becomes NLA_POLICY_MAX(NLA_U8, 2). For add
that only moves the existing fou_create() rejection earlier; del and
get ignore FOU_ATTR_TYPE altogether, so a bogus type there now fails
validation instead of being dropped on the floor.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Link: https://patch.msgid.link/20260904191412.3872344-4-kuba@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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Jakub Kicinski 2026-09-04 12:14:12 -07:00 • committed by Paolo Abeni

parent 3f4285d741

commit 1859a0cc3a

2 changed files with 2 additions and 1 deletions

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1

Documentation/netlink/specs/fou.yaml

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2

net/ipv4/fou_nl.c

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