[IPV6] MROUTE: Support PIM-SM (SSM).

Based on ancient patch by Mickael Hoerdt
<[email protected]>, which is available at
<http://www-r2.u-strasbg.fr/~hoerdt/dev/linux_ipv6_mforwarding/patch-linux-ipv6-mforwarding-0.1a>.

Signed-off-by: YOSHIFUJI Hideaki <[email protected]>

Author: yoshfuji

include/linux/mroute6.h

@@ -23,6 +23,8 @@
 #define MRT6_ADD_MFC	(MRT6_BASE+4)	/* Add a multicast forwarding entry	*/
 #define MRT6_DEL_MFC	(MRT6_BASE+5)	/* Delete a multicast forwarding entry	*/
 #define MRT6_VERSION	(MRT6_BASE+6)	/* Get the kernel multicast version	*/
+#define MRT6_ASSERT	(MRT6_BASE+7)	/* Activate PIM assert mode		*/
+#define MRT6_PIM	(MRT6_BASE+8)	/* enable PIM code	*/
 
 #define SIOCGETMIFCNT_IN6	SIOCPROTOPRIVATE	/* IP protocol privates */
 #define SIOCGETSGCNT_IN6	(SIOCPROTOPRIVATE+1)
@@ -217,6 +219,8 @@ static inline int ip6mr_sk_done(struct sock *sk) { return 0; }
 
 struct mrt6msg {
 #define MRT6MSG_NOCACHE		1
+#define MRT6MSG_WRONGMIF	2
+#define MRT6MSG_WHOLEPKT	3		/* used for use level encap */
 	__u8		im6_mbz;		/* must be zero		   */
 	__u8		im6_msgtype;		/* what type of message    */
 	__u16		im6_mif;		/* mif rec'd on		   */

net/ipv6/Kconfig

@@ -216,3 +216,10 @@ config IPV6_MROUTE
 	  Experimental support for IPv6 multicast forwarding.
 	  If unsure, say N.
 
+config IPV6_PIMSM_V2
+	bool "IPv6: PIM-SM version 2 support (EXPERIMENTAL)"
+	depends on IPV6_MROUTE
+	---help---
+	  Support for IPv6 PIM multicast routing protocol PIM-SMv2.
+	  If unsure, say N.
+