Re: [PATCH v3 1/2] macsec: Support XPN frame handling - IEEE 802.1AEbw

[David Miller]

From: Era Mayflower <mayflowerera@xxxxxxxxx>
Date: Mon,  9 Mar 2020 19:47:01 +0000

> Support extended packet number cipher suites (802.1AEbw) frames handling.
> This does not include the needed netlink patches.
> 
>     * Added xpn boolean field to `struct macsec_secy`.
>     * Added ssci field to `struct_macsec_tx_sa` (802.1AE figure 10-5).
>     * Added ssci field to `struct_macsec_rx_sa` (802.1AE figure 10-5).
>     * Added salt field to `struct macsec_key` (802.1AE 10.7 NOTE 1).
>     * Created pn_t type for easy access to lower and upper halves.
>     * Created salt_t type for easy access to the "ssci" and "pn" parts.
>     * Created `macsec_fill_iv_xpn` function to create IV in XPN mode.
>     * Support in PN recovery and preliminary replay check in XPN mode.
> 
> In addition, according to IEEE 802.1AEbw figure 10-5, the PN of incoming
> frame can be 0 when XPN cipher suite is used, so fixed the function
> `macsec_validate_skb` to fail on PN=0 only if XPN is off.
> 
> Signed-off-by: Era Mayflower <mayflowerera@xxxxxxxxx>

Applied.