macsec: introduce IEEE 802.1AE driver

This is an implementation of MACsec/IEEE 802.1AE.  This driver
provides authentication and encryption of traffic in a LAN, typically
with GCM-AES-128, and optional replay protection.

http://standards.ieee.org/getieee802/download/802.1AE-2006.pdf

Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Reviewed-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/Kconfig

@@ -193,6 +193,13 @@ config GENEVE
 	  To compile this driver as a module, choose M here: the module
 	  will be called geneve.
 
+config MACSEC
+	tristate "IEEE 802.1AE MAC-level encryption (MACsec)"
+	select CRYPTO_AES
+	select CRYPTO_GCM
+	---help---
+	   MACsec is an encryption standard for Ethernet.
+
 config NETCONSOLE
 	tristate "Network console logging support"
 	---help---

drivers/net/Makefile

@@ -10,6 +10,7 @@ obj-$(CONFIG_IPVLAN) += ipvlan/
 obj-$(CONFIG_DUMMY) += dummy.o
 obj-$(CONFIG_EQUALIZER) += eql.o
 obj-$(CONFIG_IFB) += ifb.o
+obj-$(CONFIG_MACSEC) += macsec.o
 obj-$(CONFIG_MACVLAN) += macvlan.o
 obj-$(CONFIG_MACVTAP) += macvtap.o
 obj-$(CONFIG_MII) += mii.o