xfrm: set ipv4 no_pmtu_disc flag only on output sa when direction is set

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[ Upstream commit c196def07b ]

The XFRM_STATE_NOPMTUDISC flag is only meaningful for output SAs, but
it was being applied regardless of the SA direction when the sysctl
ip_no_pmtu_disc is enabled. This can unintentionally affect input SAs.

Limit setting XFRM_STATE_NOPMTUDISC to output SAs when the SA direction
is configured.

Closes: https://github.com/strongswan/strongswan/issues/2946
Fixes: a4a87fa4e9 ("xfrm: Add Direction to the SA in or out")
Signed-off-by: Antony Antony <antony.antony@secunet.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Antony Antony 2025-12-11 11:30:27 +01:00 • committed by Greg Kroah-Hartman

parent df1fae8626

commit b7f9587f31

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net/xfrm/xfrm_state.c

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