diff options
Diffstat (limited to 'sys/netinet/ip_input.c')
| -rw-r--r-- | sys/netinet/ip_input.c | 53 |
1 files changed, 50 insertions, 3 deletions
diff --git a/sys/netinet/ip_input.c b/sys/netinet/ip_input.c index 6c45aed63234..426e757824d5 100644 --- 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 @@ -31,7 +31,7 @@ * SUCH DAMAGE. * * from: @(#)ip_input.c 7.19 (Berkeley) 5/25/91 - * $Id: ip_input.c,v 1.8 1994/01/04 17:47:13 ache Exp $ + * $Id: ip_input.c,v 1.9 1994/05/17 22:31:10 jkh Exp $ */ #include "param.h" @@ -240,6 +240,53 @@ next: 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) |