#!/bin/bash# SPDX-License-Identifier: GPL-2.0-only source ../../../net/net_helper.sh NSIM_DEV_1_ID=$((256 + RANDOM % 256))NSIM_DEV_1_SYS=/sys/bus/netdevsim/devices/netdevsim$NSIM_DEV_1_IDNSIM_DEV_2_ID=$((512 + RANDOM % 256))NSIM_DEV_2_SYS=/sys/bus/netdevsim/devices/netdevsim$NSIM_DEV_2_ID NSIM_DEV_SYS_NEW=/sys/bus/netdevsim/new_deviceNSIM_DEV_SYS_DEL=/sys/bus/netdevsim/del_deviceNSIM_DEV_SYS_LINK=/sys/bus/netdevsim/link_deviceNSIM_DEV_SYS_UNLINK=/sys/bus/netdevsim/unlink_device socat_check(){	if [ ! -x "$(command -v socat)" ]; then		echo "socat command not found. Skipping test"		return 1	fi 	return 0} setup_ns(){	set -e	ip netns add nssv	ip netns add nscl 	NSIM_DEV_1_NAME=$(find $NSIM_DEV_1_SYS/net -maxdepth 1 -type d ! \		-path $NSIM_DEV_1_SYS/net -exec basename {} \;)	NSIM_DEV_2_NAME=$(find $NSIM_DEV_2_SYS/net -maxdepth 1 -type d ! \		-path $NSIM_DEV_2_SYS/net -exec basename {} \;) 	ip link set $NSIM_DEV_1_NAME netns nssv	ip link set $NSIM_DEV_2_NAME netns nscl 	ip netns exec nssv ip addr add '192.168.1.1/24' dev $NSIM_DEV_1_NAME	ip netns exec nscl ip addr add '192.168.1.2/24' dev $NSIM_DEV_2_NAME 	ip netns exec nssv ip link set dev $NSIM_DEV_1_NAME up	ip netns exec nscl ip link set dev $NSIM_DEV_2_NAME up	set +e} cleanup_ns(){	ip netns del nscl	ip netns del nssv} ###### Code start### socat_check || exit 4 modprobe netdevsim # linking echo $NSIM_DEV_1_ID > $NSIM_DEV_SYS_NEWecho $NSIM_DEV_2_ID > $NSIM_DEV_SYS_NEWudevadm settle setup_ns NSIM_DEV_1_FD=$((256 + RANDOM % 256))exec {NSIM_DEV_1_FD}</var/run/netns/nssvNSIM_DEV_1_IFIDX=$(ip netns exec nssv cat /sys/class/net/$NSIM_DEV_1_NAME/ifindex) NSIM_DEV_2_FD=$((256 + RANDOM % 256))exec {NSIM_DEV_2_FD}</var/run/netns/nsclNSIM_DEV_2_IFIDX=$(ip netns exec nscl cat /sys/class/net/$NSIM_DEV_2_NAME/ifindex) echo "$NSIM_DEV_1_FD:$NSIM_DEV_1_IFIDX $NSIM_DEV_2_FD:2000" > $NSIM_DEV_SYS_LINK 2>/dev/nullif [ $? -eq 0 ]; then	echo "linking with non-existent netdevsim should fail"	cleanup_ns	exit 1fi echo "$NSIM_DEV_1_FD:$NSIM_DEV_1_IFIDX 2000:$NSIM_DEV_2_IFIDX" > $NSIM_DEV_SYS_LINK 2>/dev/nullif [ $? -eq 0 ]; then	echo "linking with non-existent netnsid should fail"	cleanup_ns	exit 1fi echo "$NSIM_DEV_1_FD:$NSIM_DEV_1_IFIDX $NSIM_DEV_1_FD:$NSIM_DEV_1_IFIDX" > $NSIM_DEV_SYS_LINK 2>/dev/nullif [ $? -eq 0 ]; then	echo "linking with self should fail"	cleanup_ns	exit 1fi echo "$NSIM_DEV_1_FD:$NSIM_DEV_1_IFIDX $NSIM_DEV_2_FD:$NSIM_DEV_2_IFIDX" > $NSIM_DEV_SYS_LINKif [ $? -ne 0 ]; then	echo "linking netdevsim1 with netdevsim2 should succeed"	cleanup_ns	exit 1fi # argument error checking echo "$NSIM_DEV_1_FD:$NSIM_DEV_1_IFIDX $NSIM_DEV_2_FD:a" > $NSIM_DEV_SYS_LINK 2>/dev/nullif [ $? -eq 0 ]; then	echo "invalid arg should fail"	cleanup_ns	exit 1fi # send/recv packets tmp_file=$(mktemp)ip netns exec nssv socat TCP-LISTEN:1234,fork $tmp_file &pid=$!res=0 wait_local_port_listen nssv 1234 tcp echo "HI" | ip netns exec nscl socat STDIN TCP:192.168.1.1:1234 count=$(cat $tmp_file | wc -c)if [[ $count -ne 3 ]]; then	echo "expected 3 bytes, got $count"	res=1fi echo "$NSIM_DEV_1_FD:$NSIM_DEV_1_IFIDX" > $NSIM_DEV_SYS_UNLINK echo $NSIM_DEV_2_ID > $NSIM_DEV_SYS_DEL kill $pidecho $NSIM_DEV_1_ID > $NSIM_DEV_SYS_DEL cleanup_ns modprobe -r netdevsim exit $res