change mtu also for bridge

files/bridge-post-scripts/post-up.sh.j2

@@ -14,6 +14,8 @@ ip addr add {{address}} dev {{br.name}}
 {% endfor %}
 {% endif %}
 
+_change_mtu -A "$BRIDGE_NAME"
+
 handle_gateway() {
   GATEWAY_ID=$1
   GATEWAY_ADDRESS=$2

files/bridge-post-scripts/pre-down.sh.j2

@@ -7,6 +7,8 @@ export BRIDGE_NAME={{br.name}}
 export BRIDGE_ADDRESS={{br.address}}
 {% endif %}
 
+_change_mtu -D "$BRIDGE_NAME"
+
 handle_gateway() {
   GATEWAY_ID=$1
   GATEWAY_ADDRESS=$2

files/ppp-post-scripts/postdown.sh.j2

 #!/bin/bash
 source {{ansible_user_dir}}/nextgen-router/scripts/utility.sh
 
+_change_mtu -D "$PPP_IFACE"
+
 PPPOE_NEXT_HOP_MARK=$[1000 + $(echo "$PPP_IFACE" | sed "s/ppp//g")]
 PPPOE_SELECTION_MARK=$((PPPOE_NEXT_HOP_MARK + 50))
 

files/ppp-post-scripts/postup.sh.j2

@@ -4,15 +4,7 @@ source {{ansible_user_dir}}/nextgen-router/scripts/utility.sh
 PPPOE_NEXT_HOP_MARK=$[1000 + $(echo "$PPP_IFACE" | sed "s/ppp//g")]
 PPPOE_SELECTION_MARK=$((PPPOE_NEXT_HOP_MARK + 50))
 
-INTERFACE_MTU=$(ip link show dev "$PPP_IFACE" | grep -oP 'mtu \d+' | cut -c 5-)
-
-INTERFACE_MTU_4=$((INTERFACE_MTU - 40))
-INTERFACE_MTU_6=$((INTERFACE_MTU - 60))
-
-iptables -w -t mangle -A FORWARD -o "$PPP_IFACE" -p tcp -m tcp --tcp-flags SYN,RST SYN -m tcpmss --mss $INTERFACE_MTU_4:1460 -j TCPMSS --set-mss $INTERFACE_MTU_4
-iptables -w -t mangle -A FORWARD -i "$PPP_IFACE" -p tcp -m tcp --tcp-flags SYN,RST SYN -m tcpmss --mss $INTERFACE_MTU_4:1460 -j TCPMSS --set-mss $INTERFACE_MTU_4
-ip6tables -t mangle -A FORWARD -o "$PPP_IFACE" -p tcp -m tcp --tcp-flags SYN,RST SYN -m tcpmss --mss $INTERFACE_MTU_6:1460 -j TCPMSS --set-mss $INTERFACE_MTU_6
-ip6tables -t mangle -A FORWARD -i "$PPP_IFACE" -p tcp -m tcp --tcp-flags SYN,RST SYN -m tcpmss --mss $INTERFACE_MTU_6:1460 -j TCPMSS --set-mss $INTERFACE_MTU_6
+_change_mtu -A "$PPP_IFACE"
 
 iptables -w -t nat -o "$PPP_IFACE" -A POSTROUTING -j MASQUERADE
 

files/utility.sh.j2

@@ -58,3 +58,17 @@ _wait_for_interface_online() {
   done
   echo "Interface $INTERFACE is OK."
 }
+
+_change_mtu() {
+  OPTION=$1
+  INTERFACE=$2
+  INTERFACE_MTU=$(ip link show dev "$INTERFACE" | grep -oP 'mtu \d+' | cut -c 5-)
+
+  INTERFACE_MTU_4=$((INTERFACE_MTU - 40))
+  INTERFACE_MTU_6=$((INTERFACE_MTU - 60))
+
+  iptables -w -t mangle "$OPTION" FORWARD -o "$INTERFACE" -p tcp -m tcp --tcp-flags SYN,RST SYN -m tcpmss --mss $INTERFACE_MTU_4:1460 -j TCPMSS --set-mss $INTERFACE_MTU_4
+  iptables -w -t mangle "$OPTION" FORWARD -i "$INTERFACE" -p tcp -m tcp --tcp-flags SYN,RST SYN -m tcpmss --mss $INTERFACE_MTU_4:1460 -j TCPMSS --set-mss $INTERFACE_MTU_4
+  ip6tables -w -t mangle "$OPTION" FORWARD -o "$INTERFACE" -p tcp -m tcp --tcp-flags SYN,RST SYN -m tcpmss --mss $INTERFACE_MTU_6:1460 -j TCPMSS --set-mss $INTERFACE_MTU_6
+  ip6tables -w -t mangle "$OPTION" FORWARD -i "$INTERFACE" -p tcp -m tcp --tcp-flags SYN,RST SYN -m tcpmss --mss $INTERFACE_MTU_6:1460 -j TCPMSS --set-mss $INTERFACE_MTU_6
+}