macsec: support MACsec interface

The patch is introducing MACsec interface support. In addition, it is
providing the InfoMacSec Nla. This Nla is gathering all the IFLA_MACSEC_
netlink attributes.

Please, notice that IFLA_MACSEC_PAD is omitted as it is used in SCI and
Cipher suite. It is not exposed in the nla_policy for MACsec.

Unit test added.

Signed-off-by: Fernando Fernandez Mancera <[email protected]>

src/rtnl/constants.rs

@@ -463,6 +463,34 @@ pub const IFLA_BR_VLAN_STATS_PER_PORT: u16 = 45;
 pub const IFLA_BR_MULTI_BOOLOPT: u16 = 46;
 pub const IFLA_BR_MCAST_QUERIER_STATE: u16 = 47;
 
+pub const IFLA_MACSEC_UNSPEC: u16 = 0;
+pub const IFLA_MACSEC_SCI: u16 = 1;
+pub const IFLA_MACSEC_PORT: u16 = 2;
+pub const IFLA_MACSEC_ICV_LEN: u16 = 3;
+pub const IFLA_MACSEC_CIPHER_SUITE: u16 = 4;
+pub const IFLA_MACSEC_WINDOW: u16 = 5;
+pub const IFLA_MACSEC_ENCODING_SA: u16 = 6;
+pub const IFLA_MACSEC_ENCRYPT: u16 = 7;
+pub const IFLA_MACSEC_PROTECT: u16 = 8;
+pub const IFLA_MACSEC_INC_SCI: u16 = 9;
+pub const IFLA_MACSEC_ES: u16 = 10;
+pub const IFLA_MACSEC_SCB: u16 = 11;
+pub const IFLA_MACSEC_REPLAY_PROTECT: u16 = 12;
+pub const IFLA_MACSEC_VALIDATION: u16 = 13;
+// pub const IFLA_MACSEC_PAD: u16 = 14;
+pub const IFLA_MACSEC_OFFLOAD: u16 = 15;
+pub const MACSEC_VALIDATE_DISABLED: u8 = 0;
+pub const MACSEC_VALIDATE_CHECK: u8 = 1;
+pub const MACSEC_VALIDATE_STRICT: u8 = 2;
+pub const MACSEC_OFFLOAD_OFF: u8 = 0;
+pub const MACSEC_OFFLOAD_PHY: u8 = 1;
+pub const MACSEC_OFFLOAD_MAC: u8 = 2;
+pub const MACSEC_CIPHER_ID_GCM_AES_128: u64 = 0x0080C20001000001;
+pub const MACSEC_CIPHER_ID_GCM_AES_256: u64 = 0x0080C20001000002;
+pub const MACSEC_CIPHER_ID_GCM_AES_XPN_128: u64 = 0x0080C20001000003;
+pub const MACSEC_CIPHER_ID_GCM_AES_XPN_256: u64 = 0x0080C20001000004;
+pub const MACSEC_DEFAULT_CIPHER_ID: u64 = 0x0080020001000001;
+
 pub const IFLA_MACVLAN_UNSPEC: u16 = 0;
 pub const IFLA_MACVLAN_MODE: u16 = 1;
 pub const IFLA_MACVLAN_FLAGS: u16 = 2;