Initial get-the-easy-case-working upgrade of the multicast code

to something more recent than the ancient 1.2 release contained in
4.4.  This code has the following advantages as compared to
previous versions (culled from the README file for the SunOS release):

- True multicast delivery
- Configurable rate-limiting of forwarded multicast traffic on each
  physical interface or tunnel, using a token-bucket limiter.
- Simplistic classification of packets for prioritized dropping.
- Administrative scoping of multicast address ranges.
- Faster detection of hosts leaving groups.
- Support for multicast traceroute (code not yet available).
- Support for RSVP, the Resource Reservation Protocol.

What still needs to be done:

- The multicast forwarder needs testing.
- The multicast routing daemon needs to be ported.
- Network interface drivers need to have the `#ifdef MULTICAST' goop ripped
  out of them.
- The IGMP code should probably be bogon-tested.

Some notes about the porting process:

In some cases, the Berkeley people decided to incorporate functionality from
later releases of the multicast code, but then had to do things differently.
As a result, if you look at Deering's patches, and then look at
our code, it is not always obvious whether the patch even applies.  Let
the reader beware.

I ran ip_mroute.c through several passes of `unifdef' to get rid of
useless grot, and to permanently enable the RSVP support, which we will
include as standard.

Ported by: 	Garrett Wollman
Submitted by:	Steve Deering and Ajit Thyagarajan (among others)

1 files changed, 15 insertions, 1 deletions

diff --git a/sys/netinet/in_var.h b/sys/netinet/in_var.h
index 7683644..352e19a 100644
--- a/sys/netinet/in_var.h
+++ b/sys/netinet/in_var.h
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)in_var.h	8.1 (Berkeley) 6/10/93
- * $Id: in_var.h,v 1.4 1994/08/18 22:35:29 wollman Exp $
+ * $Id: in_var.h,v 1.5 1994/08/21 05:27:30 paul Exp $
  */
 
 #ifndef _NETINET_IN_VAR_H_
@@ -115,6 +115,18 @@ extern	struct	ifqueue	ipintrq;		/* ip packet input queue */
 #endif
 
 /*
+ * This information should be part of the ifnet structure but we don't wish
+ * to change that - as it might break a number of things
+ */
+
+struct router_info {
+	struct ifnet *ifp;
+	int    type; /* type of router which is querier on this interface */
+	int    time; /* # of slow timeouts since last old query */
+	struct router_info *next;
+};
+
+/*
  * Internet multicast address structure.  There is one of these for each IP
  * multicast group to which this host belongs on a given network interface.
  * They are kept in a linked list, rooted in the interface's in_ifaddr
@@ -127,6 +139,8 @@ struct in_multi {
 	u_int	inm_refcount;		/* no. membership claims by sockets */
 	u_int	inm_timer;		/* IGMP membership report timer */
 	struct	in_multi *inm_next;	/* ptr to next multicast address */
+	u_int	inm_state;		/*  state of the membership */
+	struct	router_info *inm_rti;	/* router info*/
 };
 
 #ifdef KERNEL