diff options
Diffstat (limited to 'debian/openvpn.init.d')
| -rw-r--r-- | debian/openvpn.init.d | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/debian/openvpn.init.d b/debian/openvpn.init.d index d8e50ae..1f8a1cc 100644 --- a/debian/openvpn.init.d +++ b/debian/openvpn.init.d @@ -56,6 +56,22 @@ start_vpn () { STATUSARG="--status /var/run/openvpn.$NAME.status $STATUSREFRESH" fi + # tun using the "subnet" topology confuses the routing code that wrongly + # emits ICMP redirects for client to client communications + if grep -q '^[[:space:]]*dev[[:space:]]*tun' $CONFIG_DIR/$NAME.conf && \ + grep -q '^[[:space:]]*topology[[:space:]]*subnet' $CONFIG_DIR/$NAME.conf ; then + # When using "client-to-client", OpenVPN routes the traffic itself without + # involving the TUN/TAP interface so no ICMP redirects are sent + if ! grep -q '^[[:space:]]*client-to-client' $CONFIG_DIR/$NAME.conf ; then + sysctl -w net.ipv4.conf.all.send_redirects=0 > /dev/null + + # Save the default value for send_redirects before disabling it + # to make sure the tun device is created with send_redirects disabled + SAVED_DEFAULT_SEND_REDIRECTS=$(sysctl -n net.ipv4.conf.default.send_redirects) + sysctl -w net.ipv4.conf.default.send_redirects=0 > /dev/null + fi + fi + log_progress_msg "$NAME" STATUS=0 @@ -66,6 +82,11 @@ start_vpn () { --config $CONFIG_DIR/$NAME.conf || STATUS=1 [ "$OMIT_SENDSIGS" -ne 1 ] || ln -s /var/run/openvpn.$NAME.pid /run/sendsigs.omit.d/openvpn.$NAME.pid + + # Set the back the original default value of send_redirects if it was changed + if [ -n "$SAVED_DEFAULT_SEND_REDIRECTS" ]; then + sysctl -w net.ipv4.conf.default.send_redirects=$SAVED_DEFAULT_SEND_REDIRECTS > /dev/null + fi } stop_vpn () { kill `cat $PIDFILE` || true |