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Turn off replies to ICMP echo requests for broadcast and multicast

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addresses by default.

Add a knob "icmp_bmcastecho" to "rc.network" to allow this
behaviour to be controlled from "rc.conf".

Document the controlling sysctl variable "net.inet.icmp.bmcastecho"
in sysctl(3).

Reviewed by: dg, jkh
Reminded on -hackers by: Steinar Haug <sthaug@nethelp.no>
This commit is contained in:
Joseph Koshy 1998-09-15 10:49:03 +00:00
parent bd9d336e40
commit 61a4defd54
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=39267
10 changed files with 54 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
etc/network.subr
View File

@ -1,6 +1,6 @@
#!/bin/sh -
#
# $Id: rc.network,v 1.29 1998/08/14 06:55:17 phk Exp $
# $Id: rc.network,v 1.30 1998/09/06 08:20:11 phk Exp $
# From: @(#)netstart 5.9 (Berkeley) 3/30/91
# Note that almost all the user-configurable behavior is no longer in
@ -110,6 +110,11 @@ network_pass1() {
sysctl -w net.inet.tcp.rfc1323=0 >/dev/null 2>&1
fi
if [ X"$icmp_bmcastecho" = X"YES" ]; then
echo -n ' broadcast ping responses=YES'
sysctl -w net.inet.icmp.bmcastecho=1 >/dev/null 2>&1
fi
if [ "X$gateway_enable" = X"YES" ]; then
echo -n ' IP gateway=YES'
sysctl -w net.inet.ip.forwarding=1 >/dev/null 2>&1

5
etc/rc.conf
View File

@ -6,7 +6,7 @@
#
# All arguments must be in double or single quotes.
#
# $Id: rc.conf,v 1.55 1998/09/04 23:37:24 jkh Exp $
# $Id: rc.conf,v 1.56 1998/09/06 08:20:11 phk Exp $
##############################################################
### Important initial Boot-time options #####################
@ -114,6 +114,9 @@ arpproxy_all="" # replaces obsolete kernel option ARP_PROXYALL.
forward_sourceroute="NO" # do source routing (only if gateway_enable is set to "YES")
accept_sourceroute="NO" # accept source routed packets to us
### Miscellaneous network options: ###
icmp_bmcastecho="NO" # respond to broadcast ping packets
##############################################################
### System console options #################################

7
etc/rc.d/netoptions
View File

@ -1,6 +1,6 @@
#!/bin/sh -
#
# $Id: rc.network,v 1.29 1998/08/14 06:55:17 phk Exp $
# $Id: rc.network,v 1.30 1998/09/06 08:20:11 phk Exp $
# From: @(#)netstart 5.9 (Berkeley) 3/30/91
# Note that almost all the user-configurable behavior is no longer in
@ -110,6 +110,11 @@ network_pass1() {
sysctl -w net.inet.tcp.rfc1323=0 >/dev/null 2>&1
fi
if [ X"$icmp_bmcastecho" = X"YES" ]; then
echo -n ' broadcast ping responses=YES'
sysctl -w net.inet.icmp.bmcastecho=1 >/dev/null 2>&1
fi
if [ "X$gateway_enable" = X"YES" ]; then
echo -n ' IP gateway=YES'
sysctl -w net.inet.ip.forwarding=1 >/dev/null 2>&1

7
etc/rc.d/network1
View File

@ -1,6 +1,6 @@
#!/bin/sh -
#
# $Id: rc.network,v 1.29 1998/08/14 06:55:17 phk Exp $
# $Id: rc.network,v 1.30 1998/09/06 08:20:11 phk Exp $
# From: @(#)netstart 5.9 (Berkeley) 3/30/91
# Note that almost all the user-configurable behavior is no longer in
@ -110,6 +110,11 @@ network_pass1() {
sysctl -w net.inet.tcp.rfc1323=0 >/dev/null 2>&1
fi
if [ X"$icmp_bmcastecho" = X"YES" ]; then
echo -n ' broadcast ping responses=YES'
sysctl -w net.inet.icmp.bmcastecho=1 >/dev/null 2>&1
fi
if [ "X$gateway_enable" = X"YES" ]; then
echo -n ' IP gateway=YES'
sysctl -w net.inet.ip.forwarding=1 >/dev/null 2>&1

7
etc/rc.d/network2
View File

@ -1,6 +1,6 @@
#!/bin/sh -
#
# $Id: rc.network,v 1.29 1998/08/14 06:55:17 phk Exp $
# $Id: rc.network,v 1.30 1998/09/06 08:20:11 phk Exp $
# From: @(#)netstart 5.9 (Berkeley) 3/30/91
# Note that almost all the user-configurable behavior is no longer in
@ -110,6 +110,11 @@ network_pass1() {
sysctl -w net.inet.tcp.rfc1323=0 >/dev/null 2>&1
fi
if [ X"$icmp_bmcastecho" = X"YES" ]; then
echo -n ' broadcast ping responses=YES'
sysctl -w net.inet.icmp.bmcastecho=1 >/dev/null 2>&1
fi
if [ "X$gateway_enable" = X"YES" ]; then
echo -n ' IP gateway=YES'
sysctl -w net.inet.ip.forwarding=1 >/dev/null 2>&1

7
etc/rc.d/network3
View File

@ -1,6 +1,6 @@
#!/bin/sh -
#
# $Id: rc.network,v 1.29 1998/08/14 06:55:17 phk Exp $
# $Id: rc.network,v 1.30 1998/09/06 08:20:11 phk Exp $
# From: @(#)netstart 5.9 (Berkeley) 3/30/91
# Note that almost all the user-configurable behavior is no longer in
@ -110,6 +110,11 @@ network_pass1() {
sysctl -w net.inet.tcp.rfc1323=0 >/dev/null 2>&1
fi
if [ X"$icmp_bmcastecho" = X"YES" ]; then
echo -n ' broadcast ping responses=YES'
sysctl -w net.inet.icmp.bmcastecho=1 >/dev/null 2>&1
fi
if [ "X$gateway_enable" = X"YES" ]; then
echo -n ' IP gateway=YES'
sysctl -w net.inet.ip.forwarding=1 >/dev/null 2>&1

7
etc/rc.d/routing
View File

@ -1,6 +1,6 @@
#!/bin/sh -
#
# $Id: rc.network,v 1.29 1998/08/14 06:55:17 phk Exp $
# $Id: rc.network,v 1.30 1998/09/06 08:20:11 phk Exp $
# From: @(#)netstart 5.9 (Berkeley) 3/30/91
# Note that almost all the user-configurable behavior is no longer in
@ -110,6 +110,11 @@ network_pass1() {
sysctl -w net.inet.tcp.rfc1323=0 >/dev/null 2>&1
fi
if [ X"$icmp_bmcastecho" = X"YES" ]; then
echo -n ' broadcast ping responses=YES'
sysctl -w net.inet.icmp.bmcastecho=1 >/dev/null 2>&1
fi
if [ "X$gateway_enable" = X"YES" ]; then
echo -n ' IP gateway=YES'
sysctl -w net.inet.ip.forwarding=1 >/dev/null 2>&1

7
etc/rc.network
View File

@ -1,6 +1,6 @@
#!/bin/sh -
#
# $Id: rc.network,v 1.29 1998/08/14 06:55:17 phk Exp $
# $Id: rc.network,v 1.30 1998/09/06 08:20:11 phk Exp $
# From: @(#)netstart 5.9 (Berkeley) 3/30/91
# Note that almost all the user-configurable behavior is no longer in
@ -110,6 +110,11 @@ network_pass1() {
sysctl -w net.inet.tcp.rfc1323=0 >/dev/null 2>&1
fi
if [ X"$icmp_bmcastecho" = X"YES" ]; then
echo -n ' broadcast ping responses=YES'
sysctl -w net.inet.icmp.bmcastecho=1 >/dev/null 2>&1
fi
if [ "X$gateway_enable" = X"YES" ]; then
echo -n ' IP gateway=YES'
sysctl -w net.inet.ip.forwarding=1 >/dev/null 2>&1

8
lib/libc/gen/sysctl.3
View File

@ -479,12 +479,13 @@ The third level name is the protocol.
The fourth level name is the variable name.
The currently defined protocols and names are:
.ne 1i
.Bl -column "Protocol nameXXXXXX" "Variable nameXXX" "integerXXX" -offset indent
.It Pa Protocol name Variable name Type Changeable
.Bl -column ProtocolXX VariableXX TypeXX ChangeableXX
.It Pa Protocol Variable Type Changeable
.It ip forwarding integer yes
.It ip redirect integer yes
.It ip ttl integer yes
.It icmp maskrepl integer yes
.It icmp bmcastecho integer yes
.It udp checksum integer yes
.El
.Pp
@ -503,6 +504,9 @@ the system.
This value applies to normal transport protocols, not to ICMP.
.It Li icmp.maskrepl
Returns 1 if ICMP network mask requests are to be answered.
.It Li icmp.bmcastecho
Returns 1 if an ICMP echo request to a broadcast or multicast address is
to be answered.
.It Li udp.checksum
Returns 1 when UDP checksums are being computed and checked.
Disabling UDP checksums is strongly discouraged.

4
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 1.29 1997/08/25 16:29:27 wollman Exp $
* $Id: ip_icmp.c,v 1.30 1998/05/26 11:34:30 dg Exp $
*/
#include <sys/param.h>
@ -69,7 +69,7 @@ static int icmpmaskrepl = 0;
SYSCTL_INT(_net_inet_icmp, ICMPCTL_MASKREPL, maskrepl, CTLFLAG_RW,
&icmpmaskrepl, 0, "");
static int icmpbmcastecho = 1;
static int icmpbmcastecho = 0;
SYSCTL_INT(_net_inet_icmp, OID_AUTO, bmcastecho, CTLFLAG_RW, &icmpbmcastecho,
0, "");