From: Michael Tremer <michael.tremer@ipfire.org>
Date: Sun, 23 Jun 2019 11:57:17 +0000 (+0000)
Subject: ip-tunnel: Support setting MTU on tunnels
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9515b03940a0fac2db3fff105638f49a53f85e7d;p=network.git

ip-tunnel: Support setting MTU on tunnels

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
---

diff --git a/src/hooks/zones/ip-tunnel b/src/hooks/zones/ip-tunnel
index c4a4fb40..3c885cbd 100644
--- a/src/hooks/zones/ip-tunnel
+++ b/src/hooks/zones/ip-tunnel
@@ -26,6 +26,7 @@ SUPPORTED_IP_TUNNEL_MODES="gre sit vti"
 HOOK_SETTINGS=(
 	"MARK"
 	"MODE"
+	"MTU"
 	"PEER"
 	"LOCAL_ADDRESS"
 )
@@ -33,6 +34,9 @@ HOOK_SETTINGS=(
 # Default mode of the tunnel
 DEFAULT_MODE="gre"
 
+# Default MTU
+DEFAULT_MTU="1480"
+
 hook_check_settings() {
 	assert isset MODE && assert isoneof MODE ${SUPPORTED_IP_TUNNEL_MODES}
 
@@ -67,6 +71,16 @@ hook_parse_cmdline() {
 				fi
 				;;
 
+			--mtu=*)
+				MTU="$(cli_get_val "${1}")"
+
+				# Validate MTU
+				if ! mtu_is_valid "ipv6" "${MTU}"; then
+					error "Invalid MTU: ${MTU}"
+					return ${EXIT_ERROR}
+				fi
+				;;
+
 			--peer=*)
 				PEER="$(cli_get_val "${1}")"
 				;;
@@ -116,6 +130,7 @@ hook_up() {
 	if ! device_exists "${zone}"; then
 		ip_tunnel_add "${zone}" \
 			--mode="${MODE}" \
+			--mtu="${MTU}" \
 			--remote-address="${PEER}" \
 			--local-address="${LOCAL_ADDRESS}" \
 			--ikey="${MARK}" \