Configurably don't reply to broadcast or multicast echos. There are still
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:
parent
9f81e05855
commit
7022ea0a0c
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=28683
@ -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 */
|
||||
};
|
||||
|
||||
/*
|
||||
|
@ -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;
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user