netlink_delinearize: introduce register translation helper

Introduce a helper function to translate register numbers from the kernel
from the compat values to the NFT_REG32 values.

Internally we use the register numbers 0-16:

* 0 is the verdict register in both old and new addressing modes.
* 1-16 are the 32 bit data registers

The NFT_REG32_00 values are mapped to 1-16, the NFT_REG_1-NFT_REG_4
values are each use up 4 registers starting at 1 (1, 5, 9, 13).

Signed-off-by: Patrick McHardy <kaber@trash.net>

0 files changed, 0 insertions, 0 deletions