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Configurably don't reply to broadcast or multicast echos. There are still

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potential problems with other automatic-reply ICMPs, but some of them may
depend on broadcast/multicast to operate.  (This code can simply be
moved to the `reflect' label to generalize it.)
This commit is contained in:
wollman 1997-08-25 01:25:31 +00:00
parent fe1bc8105f
commit dbffeebf4d
2 changed files with 13 additions and 2 deletions
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3
sys/netinet/icmp_var.h
View File

@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)icmp_var.h 8.1 (Berkeley) 6/10/93
* $Id$
* $Id: icmp_var.h,v 1.6 1997/02/22 09:41:24 peter Exp $
*/
#ifndef _NETINET_ICMP_VAR_H_
@ -54,6 +54,7 @@ struct icmpstat {
u_long icps_badlen; /* calculated bound mismatch */
u_long icps_reflect; /* number of responses */
u_long icps_inhist[ICMP_MAXTYPE + 1];
u_long icps_bmcastecho; /* b/mcast echo requests dropped */
};
/*

12
sys/netinet/ip_icmp.c
View File

@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94
* $Id: ip_icmp.c,v 1.26 1997/05/23 22:33:16 julian Exp $
* $Id: ip_icmp.c,v 1.27 1997/08/02 14:32:53 bde Exp $
*/
#include <sys/param.h>
@ -69,6 +69,10 @@ static int icmpmaskrepl = 0;
SYSCTL_INT(_net_inet_icmp, ICMPCTL_MASKREPL, maskrepl, CTLFLAG_RW,
&icmpmaskrepl, 0, "");
static int icmpbmcastecho = 1;
SYSCTL_INT(_net_inet_icmp, OID_AUTO, bmcastecho, CTLFLAG_RW, &icmpbmcastecho,
0, "");
#ifdef ICMPPRINTFS
int icmpprintfs = 0;
#endif
@ -370,6 +374,12 @@ icmp_input(m, hlen)
break;
case ICMP_ECHO:
if (!icmpbmcastecho
&& (m->m_flags & (M_MCAST | M_BCAST)) != 0
&& IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
icmpstat.icps_bmcastecho++;
break;
}
icp->icmp_type = ICMP_ECHOREPLY;
goto reflect;