Add net.inet.icmp.log_redirect and net.inet.icmp.drop_redirect, for
respectively logging and dropping ICMP REDIRECT packets. Note that there is no rate limiting on the log messages, so log_redirect should be used with caution (preferrably only for debugging purposes).
This commit is contained in:
Dag-Erling Smørgrav
parent
875f316170
commit
18d3153ead
@ -9,7 +9,7 @@
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#
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# All arguments must be in double or single quotes.
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#
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# $Id: rc.conf,v 1.23 1999/07/26 10:49:33 brian Exp $
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# $Id: rc.conf,v 1.24 1999/08/03 10:11:02 eivind Exp $
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##############################################################
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### Important initial Boot-time options ####################
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@ -48,6 +48,8 @@ natd_flags="" # Additional flags for natd.
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tcp_extensions="NO" # Set to Yes to turn on RFC1323 extensions.
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log_in_vain="NO" # Disallow bad connection logging (or YES).
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tcp_keepalive="YES" # Kill dead TCP connections (or NO).
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icmp_drop_redirect="NO" # Set to YES to ignore ICMP REDIRECT packets
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icmp_log_redirect="NO" # Set to YES to log ICMP REDIRECT packets
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network_interfaces="auto" # List of network interfaces (or "auto").
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ifconfig_lo0="inet 127.0.0.1" # default loopback device configuration.
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#ifconfig_lo0_alias0="inet 127.0.0.254 netmask 0xffffffff" # Sample alias entry.
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@ -1,6 +1,6 @@
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#!/bin/sh -
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#
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# $Id: rc.network,v 1.51 1999/07/26 10:49:31 brian Exp $
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# $Id: rc.network,v 1.52 1999/07/26 15:17:23 brian Exp $
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# From: @(#)netstart 5.9 (Berkeley) 3/30/91
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# Note that almost all the user-configurable behavior is no longer in
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@ -197,6 +197,16 @@ network_pass1() {
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echo -n ' broadcast ping responses=YES'
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sysctl -w net.inet.icmp.bmcastecho=1 >/dev/null
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fi
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if [ "X$icmp_drop_redirect" = X"YES" ]; then
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echo -n ' ignore ICMP redirect=YES'
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sysctl -w net.inet.icmp.drop_redirect=1 >/dev/null
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fi
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if [ "X$icmp_log_redirect" = X"YES" ]; then
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echo -n ' log ICMP redirect=YES'
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sysctl -w net.inet.icmp.log_redirect=1 >/dev/null
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fi
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if [ "X$gateway_enable" = X"YES" ]; then
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echo -n ' IP gateway=YES'
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@ -1,6 +1,6 @@
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#!/bin/sh -
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#
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# $Id: rc.network,v 1.51 1999/07/26 10:49:31 brian Exp $
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# $Id: rc.network,v 1.52 1999/07/26 15:17:23 brian Exp $
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# From: @(#)netstart 5.9 (Berkeley) 3/30/91
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# Note that almost all the user-configurable behavior is no longer in
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@ -197,6 +197,16 @@ network_pass1() {
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echo -n ' broadcast ping responses=YES'
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sysctl -w net.inet.icmp.bmcastecho=1 >/dev/null
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fi
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if [ "X$icmp_drop_redirect" = X"YES" ]; then
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echo -n ' ignore ICMP redirect=YES'
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sysctl -w net.inet.icmp.drop_redirect=1 >/dev/null
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fi
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if [ "X$icmp_log_redirect" = X"YES" ]; then
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echo -n ' log ICMP redirect=YES'
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sysctl -w net.inet.icmp.log_redirect=1 >/dev/null
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fi
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if [ "X$gateway_enable" = X"YES" ]; then
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echo -n ' IP gateway=YES'
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@ -1,6 +1,6 @@
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#!/bin/sh -
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#
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# $Id: rc.network,v 1.51 1999/07/26 10:49:31 brian Exp $
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# $Id: rc.network,v 1.52 1999/07/26 15:17:23 brian Exp $
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# From: @(#)netstart 5.9 (Berkeley) 3/30/91
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# Note that almost all the user-configurable behavior is no longer in
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@ -197,6 +197,16 @@ network_pass1() {
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echo -n ' broadcast ping responses=YES'
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sysctl -w net.inet.icmp.bmcastecho=1 >/dev/null
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fi
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if [ "X$icmp_drop_redirect" = X"YES" ]; then
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echo -n ' ignore ICMP redirect=YES'
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sysctl -w net.inet.icmp.drop_redirect=1 >/dev/null
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fi
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if [ "X$icmp_log_redirect" = X"YES" ]; then
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echo -n ' log ICMP redirect=YES'
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sysctl -w net.inet.icmp.log_redirect=1 >/dev/null
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fi
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if [ "X$gateway_enable" = X"YES" ]; then
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echo -n ' IP gateway=YES'
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@ -1,6 +1,6 @@
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#!/bin/sh -
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#
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# $Id: rc.network,v 1.51 1999/07/26 10:49:31 brian Exp $
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# $Id: rc.network,v 1.52 1999/07/26 15:17:23 brian Exp $
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# From: @(#)netstart 5.9 (Berkeley) 3/30/91
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# Note that almost all the user-configurable behavior is no longer in
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@ -197,6 +197,16 @@ network_pass1() {
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echo -n ' broadcast ping responses=YES'
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sysctl -w net.inet.icmp.bmcastecho=1 >/dev/null
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fi
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if [ "X$icmp_drop_redirect" = X"YES" ]; then
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echo -n ' ignore ICMP redirect=YES'
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sysctl -w net.inet.icmp.drop_redirect=1 >/dev/null
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fi
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if [ "X$icmp_log_redirect" = X"YES" ]; then
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echo -n ' log ICMP redirect=YES'
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sysctl -w net.inet.icmp.log_redirect=1 >/dev/null
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fi
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if [ "X$gateway_enable" = X"YES" ]; then
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echo -n ' IP gateway=YES'
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@ -1,6 +1,6 @@
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#!/bin/sh -
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#
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# $Id: rc.network,v 1.51 1999/07/26 10:49:31 brian Exp $
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# $Id: rc.network,v 1.52 1999/07/26 15:17:23 brian Exp $
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# From: @(#)netstart 5.9 (Berkeley) 3/30/91
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# Note that almost all the user-configurable behavior is no longer in
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@ -197,6 +197,16 @@ network_pass1() {
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echo -n ' broadcast ping responses=YES'
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sysctl -w net.inet.icmp.bmcastecho=1 >/dev/null
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fi
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if [ "X$icmp_drop_redirect" = X"YES" ]; then
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echo -n ' ignore ICMP redirect=YES'
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sysctl -w net.inet.icmp.drop_redirect=1 >/dev/null
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fi
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if [ "X$icmp_log_redirect" = X"YES" ]; then
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echo -n ' log ICMP redirect=YES'
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sysctl -w net.inet.icmp.log_redirect=1 >/dev/null
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fi
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if [ "X$gateway_enable" = X"YES" ]; then
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echo -n ' IP gateway=YES'
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@ -1,6 +1,6 @@
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#!/bin/sh -
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#
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# $Id: rc.network,v 1.51 1999/07/26 10:49:31 brian Exp $
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# $Id: rc.network,v 1.52 1999/07/26 15:17:23 brian Exp $
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# From: @(#)netstart 5.9 (Berkeley) 3/30/91
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# Note that almost all the user-configurable behavior is no longer in
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@ -197,6 +197,16 @@ network_pass1() {
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echo -n ' broadcast ping responses=YES'
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sysctl -w net.inet.icmp.bmcastecho=1 >/dev/null
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fi
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if [ "X$icmp_drop_redirect" = X"YES" ]; then
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echo -n ' ignore ICMP redirect=YES'
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sysctl -w net.inet.icmp.drop_redirect=1 >/dev/null
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fi
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if [ "X$icmp_log_redirect" = X"YES" ]; then
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echo -n ' log ICMP redirect=YES'
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sysctl -w net.inet.icmp.log_redirect=1 >/dev/null
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fi
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if [ "X$gateway_enable" = X"YES" ]; then
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echo -n ' IP gateway=YES'
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@ -1,6 +1,6 @@
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#!/bin/sh -
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#
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# $Id: rc.network,v 1.51 1999/07/26 10:49:31 brian Exp $
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# $Id: rc.network,v 1.52 1999/07/26 15:17:23 brian Exp $
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# From: @(#)netstart 5.9 (Berkeley) 3/30/91
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# Note that almost all the user-configurable behavior is no longer in
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@ -197,6 +197,16 @@ network_pass1() {
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echo -n ' broadcast ping responses=YES'
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sysctl -w net.inet.icmp.bmcastecho=1 >/dev/null
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fi
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if [ "X$icmp_drop_redirect" = X"YES" ]; then
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echo -n ' ignore ICMP redirect=YES'
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sysctl -w net.inet.icmp.drop_redirect=1 >/dev/null
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fi
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if [ "X$icmp_log_redirect" = X"YES" ]; then
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echo -n ' log ICMP redirect=YES'
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sysctl -w net.inet.icmp.log_redirect=1 >/dev/null
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fi
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if [ "X$gateway_enable" = X"YES" ]; then
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echo -n ' IP gateway=YES'
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@ -31,7 +31,7 @@
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* SUCH DAMAGE.
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*
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* @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94
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* $Id: ip_icmp.c,v 1.33 1998/12/04 04:21:25 dillon Exp $
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* $Id: ip_icmp.c,v 1.34 1999/03/06 23:10:42 archie Exp $
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*/
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#include <sys/param.h>
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@ -69,6 +69,14 @@ static int icmpmaskrepl = 0;
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SYSCTL_INT(_net_inet_icmp, ICMPCTL_MASKREPL, maskrepl, CTLFLAG_RW,
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&icmpmaskrepl, 0, "");
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static int log_redirect = 0;
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SYSCTL_INT(_net_inet_icmp, OID_AUTO, log_redirect, CTLFLAG_RW,
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&log_redirect, 0, "");
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static int drop_redirect = 0;
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SYSCTL_INT(_net_inet_icmp, OID_AUTO, drop_redirect, CTLFLAG_RW,
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&drop_redirect, 0, "");
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#ifdef ICMP_BANDLIM
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/*
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@ -92,8 +100,8 @@ SYSCTL_INT(_net_inet_icmp, ICMPCTL_ICMPLIM, icmplim, CTLFLAG_RD,
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*/
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static int icmpbmcastecho = 0;
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SYSCTL_INT(_net_inet_icmp, OID_AUTO, bmcastecho, CTLFLAG_RW, &icmpbmcastecho,
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0, "");
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SYSCTL_INT(_net_inet_icmp, OID_AUTO, bmcastecho, CTLFLAG_RW,
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&icmpbmcastecho, 0, "");
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#ifdef ICMPPRINTFS
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@ -462,6 +470,23 @@ icmp_input(m, hlen)
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return;
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case ICMP_REDIRECT:
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if (log_redirect) {
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u_long src, dst, gw;
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src = ntohl(ip->ip_src.s_addr);
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dst = ntohl(icp->icmp_ip.ip_dst.s_addr);
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gw = ntohl(icp->icmp_gwaddr.s_addr);
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printf("icmp redirect from %d.%d.%d.%d: "
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"%d.%d.%d.%d => %d.%d.%d.%d\n",
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(int)(src >> 24), (int)((src >> 16) & 0xff),
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(int)((src >> 8) & 0xff), (int)(src & 0xff),
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(int)(dst >> 24), (int)((dst >> 16) & 0xff),
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(int)((dst >> 8) & 0xff), (int)(dst & 0xff),
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(int)(gw >> 24), (int)((gw >> 16) & 0xff),
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(int)((gw >> 8) & 0xff), (int)(gw & 0xff));
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}
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if (drop_redirect)
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break;
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if (code > 3)
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goto badcode;
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if (icmplen < ICMP_ADVLENMIN || icmplen < ICMP_ADVLEN(icp) ||
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