netlink: allow netlink to be build in the kernel

Differential Revision: https://reviews.freebsd.org/D37781

sys/conf/NOTES

@@ -692,6 +692,9 @@ options		IPSEC_SUPPORT
 # TLS framing and encryption/decryption of data over TCP sockets.
 options		KERN_TLS		# TLS transmit and receive offload
 
+# Netlink kernel/user<>kernel/user messaging interface
+options		NETLINK
+
 #
 # SMB/CIFS requester
 # NETSMB enables support for SMB protocol, it requires LIBMCHAIN and LIBICONV

sys/conf/files

@@ -4471,6 +4471,18 @@ netipsec/xform_ipcomp.c		optional ipsec inet | ipsec inet6
 netipsec/xform_tcp.c		optional ipsec inet tcp_signature | \
 	 ipsec inet6 tcp_signature | ipsec_support inet tcp_signature | \
 	 ipsec_support inet6 tcp_signature
+netlink/netlink_domain.c	optional netlink
+netlink/netlink_generic.c	optional netlink
+netlink/netlink_io.c		optional netlink
+netlink/netlink_message_parser.c	optional netlink
+netlink/netlink_message_writer.c	optional netlink
+netlink/netlink_module.c	optional netlink
+netlink/netlink_route.c		optional netlink
+netlink/route/iface_drivers.c	optional netlink
+netlink/route/iface.c		optional netlink
+netlink/route/neigh.c		optional netlink
+netlink/route/nexthop.c		optional netlink
+netlink/route/rt.c		optional netlink
 netpfil/ipfw/dn_aqm_codel.c	optional inet dummynet
 netpfil/ipfw/dn_aqm_pie.c	optional inet dummynet
 netpfil/ipfw/dn_heap.c		optional inet dummynet

sys/conf/options

@@ -459,6 +459,7 @@ MBUF_PROFILING
 MBUF_STRESS_TEST
 MROUTING		opt_mrouting.h
 NFSLOCKD
+NETLINK
 PF_DEFAULT_TO_DROP	opt_pf.h
 ROUTE_MPATH		opt_route.h
 ROUTETABLES		opt_route.h

sys/modules/netlink/Makefile

@@ -4,7 +4,7 @@ KMOD=	netlink
 SRCS =	netlink_module.c netlink_domain.c netlink_io.c \
 	netlink_message_parser.c netlink_message_writer.c  netlink_generic.c \
 	netlink_route.c route/iface.c route/iface_drivers.c route/neigh.c \
-	route/nexthop.c route/route.c
+	route/nexthop.c route/rt.c
 SRCS+=	opt_inet.h opt_inet6.h opt_route.h
 
 EXPORT_SYMS=