[NETFILTER]: Add SANE connection tracking helper

This is nf_conntrack_sane, a netfilter connection tracking helper module
for the SANE protocol used by the 'saned' daemon to make scanners available
via network. The SANE protocol uses separate control & data connections,
similar to passive FTP. The helper module is needed to recognize the data
connection as RELATED to the control one.

Signed-off-by: Michal Schmidt <mschmidt@redhat.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index 80107d4..614c92c 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -235,6 +235,19 @@
 
 	  To compile it as a module, choose M here.  If unsure, say N.
 
+config NF_CONNTRACK_SANE
+	tristate "SANE protocol support (EXPERIMENTAL)"
+	depends on EXPERIMENTAL && NF_CONNTRACK
+	help
+	  SANE is a protocol for remote access to scanners as implemented
+	  by the 'saned' daemon. Like FTP, it uses separate control and
+	  data connections.
+
+	  With this module you can support SANE on a connection tracking
+	  firewall.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
 config NF_CONNTRACK_SIP
 	tristate "SIP protocol support (EXPERIMENTAL)"
 	depends on EXPERIMENTAL && NF_CONNTRACK