Add cbma_check_secured.sh functional test

common/tests/functional/test_cbma/cbma_check_secured.sh

@@ -0,0 +1,68 @@
+#!/bin/sh
+
+BATMAN_ETHER_PROTO='0x4305'
+MACSEC_ETHER_PROTO='0x88e5'
+MACSEC_PACKET_BYTES_OFFSET=36
+TIMEOUT_SECONDS=10
+
+
+if [ $# -eq 0 ]; then
+    echo "Usage: $0 <non-bat-iface> [<peer-mac>]"
+    exit 1
+fi
+
+check_dependencies() {
+    for t in tcpdump timeout; do
+        if ! type $t >/dev/null 2>&1; then
+            echo "[!] FATAL: '$t' is missing!" >&2
+            exit 2
+        fi
+    done
+}
+
+check_interface() {
+    iface="$1"
+
+    if [ ! -e "/sys/class/net/${iface}/address" ]; then
+        echo "'$iface' does not exist" >&2
+        exit 3
+    fi
+    case "$iface" in bat*) MULTICAST_PORT=$((MULTICAST_PORT + 1));; esac
+}
+
+check_mac_address() {
+    mac="$1"
+
+    if [ -n "$mac" ] && ! echo "$mac" | grep -Eiqx '([0-9a-f]{2}:){5}[0-9a-f]{2}'; then
+	      echo "'$mac' is not a valid MAC address" >&2
+	      exit 4
+    fi
+}
+
+cbma_check_secured() {
+    iface="$1"
+    peer_mac="$2"
+
+    if [ -n "$peer_mac" ]; then
+        capture_iface="lms$(echo $peer_mac | tr -d ':')"
+    else
+        capture_iface="lmb$(tr -d ':' < /sys/class/net/"$iface"/address)"
+    fi
+    if ! ( check_interface "$capture_iface" 2>/dev/null ); then
+        echo "'$peer_mac' peer is not connected"
+        exit 5
+    fi
+
+    packet="$(timeout $TIMEOUT_SECONDS tcpdump -c1 -i "$capture_iface" -qQ out ether proto $BATMAN_ETHER_PROTO and ether[$MACSEC_PACKET_BYTES_OFFSET:2] == $MACSEC_ETHER_PROTO 2>/dev/null)"
+
+    if [ -z "$packet" ]; then
+        echo 'Fail'
+        exit 6
+    fi
+    echo 'Pass'
+}
+
+check_dependencies
+check_interface $1
+check_mac_address $2
+cbma_check_secured $@