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xfrm: add XFRM_MSG_MIGRATE_STATE for single SA migration

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Add a new netlink method to migrate a single xfrm_state.
Unlike the existing migration mechanism (SA + policy), this
supports migrating only the SA and allows changing the reqid.

The SA is looked up via xfrm_usersa_id, which uniquely
identifies it, so old_saddr is not needed. old_daddr is carried in
xfrm_usersa_id.daddr.

The reqid is invariant in the old migration.

Signed-off-by: Antony Antony <antony.antony@secunet.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Antony Antony 2026-05-26 21:09:51 +02:00 • committed by Steffen Klassert
commit a9d155ea9b
7 changed files with 405 additions and 17 deletions
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