xfrm: add support for UDPv6 encapsulation of ESP

This patch adds support for encapsulation of ESP over UDPv6. The code
is very similar to the IPv4 encapsulation implementation, and allows
to easily add espintcp on IPv6 as a follow-up.

Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

net/ipv6/ah6.c

@@ -767,6 +767,7 @@ static const struct xfrm_type ah6_type = {
 
 static struct xfrm6_protocol ah6_protocol = {
 	.handler	=	xfrm6_rcv,
+	.input_handler	=	xfrm_input,
 	.cb_handler	=	ah6_rcv_cb,
 	.err_handler	=	ah6_err,
 	.priority	=	0,