added my responsibility for the `cpm' port

[unix-history] / sys / netinet / ip_input.c

diff --git a/sys/netinet/ip_input.c b/sys/netinet/ip_input.c
index 7535e34..8d4765d 100644 (file)
--- a/sys/netinet/ip_input.c
+++ b/sys/netinet/ip_input.c
@@ -1,6 +1,6 @@
 /*
 /*

- * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
- * All rights reserved.
+ * Copyright (c) 1982, 1986, 1988, 1993
+ *     Regents of the University of California.  All rights reserved.

  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions


@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *     from: @(#)ip_input.c    7.19 (Berkeley) 5/25/91
  * SUCH DAMAGE.
  *
  *     from: @(#)ip_input.c    7.19 (Berkeley) 5/25/91

- *     $Id: ip_input.c,v 1.7 1993/12/19 00:52:43 wollman Exp $
+ *     $Id: ip_input.c,v 1.8 1994/01/04 17:47:13 ache Exp $

  */
 
 #include "param.h"
  */
 
 #include "param.h"


@@ -240,6 +240,53 @@ next:
                                goto ours;
                }
        }
                                goto ours;
                }
        }

+#ifdef MULTICAST
+       if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
+               struct in_multi *inm;
+#ifdef MROUTING
+               extern struct socket *ip_mrouter;
+
+               if (ip_mrouter) {
+                       /*
+                        * If we are acting as a multicast router, all
+                        * incoming multicast packets are passed to the
+                        * kernel-level multicast forwarding function.
+                        * The packet is returned (relatively) intact; if
+                        * ip_mforward() returns a non-zero value, the packet
+                        * must be discarded, else it may be accepted below.
+                        *
+                        * (The IP ident field is put in the same byte order
+                        * as expected when ip_mforward() is called from
+                        * ip_output().)
+                        */
+                       ip->ip_id = htons(ip->ip_id);
+                       if (ip_mforward(ip, m->m_pkthdr.rcvif, m) != 0) {
+                               m_freem(m);
+                               goto next;
+                       }
+                       ip->ip_id = ntohs(ip->ip_id);
+
+                       /*
+                        * The process-level routing demon needs to receive
+                        * all multicast IGMP packets, whether or not this
+                        * host belongs to their destination groups.
+                        */
+                       if (ip->ip_p == IPPROTO_IGMP)
+                               goto ours;
+               }
+#endif
+               /*
+                * See if we belong to the destination multicast group on the
+                * arrival interface.
+                */
+               IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
+               if (inm == NULL) {
+                       m_freem(m);
+                       goto next;
+               }
+               goto ours;
+       }
+#endif

        if (ip->ip_dst.s_addr == (u_long)INADDR_BROADCAST)
                goto ours;
        if (ip->ip_dst.s_addr == INADDR_ANY)
        if (ip->ip_dst.s_addr == (u_long)INADDR_BROADCAST)
                goto ours;
        if (ip->ip_dst.s_addr == INADDR_ANY)