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ICMP messages received from broken hosts which reply to multicast packets

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were mistakenly delivered, rather than getting thrown out, which caused
substantial lossage.

Submitted by: Bill Fenner <fenner@parc.xerox.com>
This commit is contained in:
Garrett Wollman 1995-07-10 16:16:00 +00:00
parent b399224dfb
commit 5b7ee6ed04
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=9472
1 changed files with 8 additions and 4 deletions
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12
sys/netinet/ip_icmp.c
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@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94
* $Id: ip_icmp.c,v 1.6 1995/03/16 18:14:54 bde Exp $
* $Id: ip_icmp.c,v 1.7 1995/05/30 08:09:42 rgrimes Exp $
*/
#include <sys/param.h>
@ -220,13 +220,14 @@ icmp_input(m, hlen)
m->m_data -= hlen;
#ifdef ICMPPRINTFS
/*
* Message type specific processing.
*/
if (icmpprintfs)
printf("icmp_input, type %d code %d\n", icp->icmp_type,
icp->icmp_code);
#endif
/*
* Message type specific processing.
*/
if (icp->icmp_type > ICMP_MAXTYPE)
goto raw;
icmpstat.icps_inhist[icp->icmp_type]++;
@ -291,6 +292,9 @@ icmp_input(m, hlen)
goto freeit;
}
NTOHS(icp->icmp_ip.ip_len);
/* Discard ICMP's in response to multicast packets */
if (IN_MULTICAST(ntohl(icp->icmp_ip.ip_dst.s_addr)))
goto badcode;
#ifdef ICMPPRINTFS
if (icmpprintfs)
printf("deliver to protocol %d\n", icp->icmp_ip.ip_p);