[NETFILTER]: Add NetBIOS name service helper
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index e046f55..fd2eb5d 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -85,6 +85,25 @@
To compile it as a module, choose M here. If unsure, say Y.
+config IP_NF_NETBIOS_NS
+ tristate "NetBIOS name service protocol support (EXPERIMENTAL)"
+ depends on IP_NF_CONNTRACK && EXPERIMENTAL
+ help
+ NetBIOS name service requests are sent as broadcast messages from an
+ unprivileged port and responded to with unicast messages to the
+ same port. This make them hard to firewall properly because connection
+ tracking doesn't deal with broadcasts. This helper tracks locally
+ originating NetBIOS name service requests and the corresponding
+ responses. It relies on correct IP address configuration, specifically
+ netmask and broadcast address. When properly configured, the output
+ of "ip address show" should look similar to this:
+
+ $ ip -4 address show eth0
+ 4: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
+ inet 172.16.2.252/24 brd 172.16.2.255 scope global eth0
+
+ To compile it as a module, choose M here. If unsure, say N.
+
config IP_NF_TFTP
tristate "TFTP protocol support"
depends on IP_NF_CONNTRACK