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#!/bin/bash
# Configuration
NS_NAME="net6"
VETH_HOST="veth0"
VETH_NS="veth1"
RXE_NAME="rxe6"
PORT=4791
IP6_ADDR="2001:db8::1/64"
exec > /dev/null
# Cleanup function to run on exit (even on failure)
cleanup() {
ip netns del "$NS_NAME" 2>/dev/null
modprobe -r rdma_rxe 2>/dev/null
echo "Done."
}
trap cleanup EXIT
# 1. Prerequisites check
for mod in tun veth rdma_rxe; do
if ! modinfo "$mod" >/dev/null 2>&1; then
echo "Error: Kernel module '$mod' not found."
exit 1
fi
done
modprobe rdma_rxe
# 2. Setup Namespace and Networking
echo "Setting up IPv6 network namespace..."
ip netns add "$NS_NAME"
ip link add "$VETH_HOST" type veth peer name "$VETH_NS"
ip link set "$VETH_NS" netns "$NS_NAME"
ip netns exec "$NS_NAME" ip addr add "$IP6_ADDR" dev "$VETH_NS"
ip netns exec "$NS_NAME" ip link set "$VETH_NS" up
ip link set "$VETH_HOST" up
# 3. Add RDMA Link
echo "Adding RDMA RXE link..."
if ! ip netns exec "$NS_NAME" rdma link add "$RXE_NAME" type rxe netdev "$VETH_NS"; then
echo "Error: Failed to create RXE link."
exit 1
fi
# 4. Verification: Port should be listening
# Using -H to skip headers and -q for quiet exit codes
if ! ip netns exec "$NS_NAME" ss -Hul6n sport = :$PORT | grep -q ":$PORT"; then
echo "Error: UDP port $PORT is NOT listening after link creation."
exit 1
fi
echo "Verified: Port $PORT is active."
# 5. Removal and Verification
echo "Deleting RDMA link..."
ip netns exec "$NS_NAME" rdma link del "$RXE_NAME"
if ip netns exec "$NS_NAME" ss -Hul6n sport = :$PORT | grep -q ":$PORT"; then
echo "Error: UDP port $PORT still active after link deletion."
exit 1
fi
echo "Verified: Port $PORT closed successfully."
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