#!/bin/sh
# DF-0572 run: drives parallel UDP traffic through ipfw3 NAT to expose the per-CPU
# cfg_nat cache collapse. On the bug-present module ALL outbound states converge
# onto ONE cpu_id (the cached cfg_nat); on the fixed module they would distribute.
#
# MUST RUN AS ROOT on the guest (modules + firewall).  Run the trigger as the
# unprivileged user (maxx) in parallel.
set -e
sysctl net.filters_default_to_accept=1 >/dev/null 2>&1 || true
kldload ipfw3        2>/dev/null || true
kldload ipfw3_basic  2>/dev/null || true
kldload ipfw3_nat    2>/dev/null || true
ALIAS_IP=$(ifconfig vtnet0 | grep 'inet ' | awk '{print $2}')
ipfw3 nat 1 config ip "$ALIAS_IP" 2>/dev/null || true
ipfw3 add 100 nat 1 udp from any to any out via vtnet0 2>/dev/null || true

cc -O2 -o /tmp/nat_oob_trigger nat_oob_trigger.c
echo "driving 6 parallel UDP senders across all CPUs..."
for i in 1 2 3 4 5 6; do /tmp/nat_oob_trigger 1500 10.0.2.2 >/dev/null 2>&1 & done
wait

echo "=== outbound UDP state cpu_id distribution (bug-present => ALL on one cpu) ==="
ipfw3 nat 1 show state 2>/dev/null | grep ' udp ' | awk '$7=="o"{print $2}' | sort -n | uniq -c
echo "=== on the FIXED (no-cache) module + multi-queue NIC, states distribute across 0..5 ==="