xfrm: XFRM_MSG_MIGRATE_STATE new netlink message

The current XFRM_MSG_MIGRATE interface is tightly coupled to policy and
SA migration, and it lacks the information required to reliably migrate
individual SAs. This makes it unsuitable for IKEv2 deployments,
dual-stack setups (IPv4/IPv6), and scenarios where policies are managed
externally (e.g., by other daemons than IKE daemon).

Mandatory SA selector list
The current API requires a non-empty SA selector list, which does not reflect
IKEv2 use case. A single Child SA may correspond to multiple policies,
and SA discovery already occurs via address and reqid matching. With
dual-stack Child SAs this leads to excessive churn: the current method
would have to be called up to six times (in/out/fwd × v4/v6) on SA,
while the new method only requires two calls. While polices are
migrated, first installing a block policy

Selectors lack SPI (and marks)
XFRM_MSG_MIGRATE cannot uniquely identify an SA when multiple SAs share
the same policies (per-CPU SAs, SELinux label-based SAs, etc.). Without
the SPI, the kernel may update the wrong SA instance.

Reqid cannot be changed
Some implementations allocate reqids based on traffic selectors. In
host-to-host or selector-changing scenarios, the reqid must change,
which the current API cannot express.

Because strongSwan and other implementations manage policies
independently of the kernel, an interface that updates only a specific
SA — with complete and unambiguous identification — is required.

XFRM_MSG_MIGRATE_STATE provides that interface. It supports migration
of a single SA via xfrm_usersa_id (including SPI) and we fix
encap removal in this patch set, reqid updates, address changes,
and other SA-specific parameters. It avoids the structural limitations of
XFRM_MSG_MIGRATE and provides a simpler, extensible mechanism for
precise per-SA migration without involving policies.

Antony Antony (5):
  xfrm: migrate encap should be set in migrate call
  xfrm: rename reqid in xfrm_migrate
  xfrm: new method XFRM_MSG_MIGRATE_STATE
  xfrm: reqid is invarient in old migration
  xfrm: check that SA is in VALID state before use

 include/net/xfrm.h          |   7 +-
 include/uapi/linux/xfrm.h   |  10 +++
 net/key/af_key.c            |  10 +--
 net/xfrm/xfrm_policy.c      |   4 +-
 net/xfrm/xfrm_replay.c      |  16 ++++
 net/xfrm/xfrm_state.c       |  37 ++++----
 net/xfrm/xfrm_user.c        | 166 +++++++++++++++++++++++++++++++++++-
 security/selinux/nlmsgtab.c |   3 +-
 8 files changed, 221 insertions(+), 32 deletions(-)


Antony

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2.39.5