tools/testing/selftests/net/tfo_passive.sh

Source file repositories/reference/linux-study-clean/tools/testing/selftests/net/tfo_passive.sh

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/net/tfo_passive.sh
Extension
.sh
Size
2782 bytes
Lines
124
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: tools
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
source lib.sh

NSIM_SV_ID=$((256 + RANDOM % 256))
NSIM_SV_SYS=/sys/bus/netdevsim/devices/netdevsim$NSIM_SV_ID
NSIM_CL_ID=$((512 + RANDOM % 256))
NSIM_CL_SYS=/sys/bus/netdevsim/devices/netdevsim$NSIM_CL_ID

NSIM_DEV_SYS_NEW=/sys/bus/netdevsim/new_device
NSIM_DEV_SYS_DEL=/sys/bus/netdevsim/del_device
NSIM_DEV_SYS_LINK=/sys/bus/netdevsim/link_device
NSIM_DEV_SYS_UNLINK=/sys/bus/netdevsim/unlink_device

SERVER_IP=192.168.1.1
CLIENT_IP=192.168.1.2
SERVER_PORT=48675

setup_ns()
{
	set -e
	ip netns add nssv
	ip netns add nscl

	NSIM_SV_NAME=$(find $NSIM_SV_SYS/net -maxdepth 1 -type d ! \
		-path $NSIM_SV_SYS/net -exec basename {} \;)
	NSIM_CL_NAME=$(find $NSIM_CL_SYS/net -maxdepth 1 -type d ! \
		-path $NSIM_CL_SYS/net -exec basename {} \;)

	ip link set $NSIM_SV_NAME netns nssv
	ip link set $NSIM_CL_NAME netns nscl

	ip netns exec nssv ip addr add "${SERVER_IP}/24" dev $NSIM_SV_NAME
	ip netns exec nscl ip addr add "${CLIENT_IP}/24" dev $NSIM_CL_NAME

	ip netns exec nssv ip link set dev $NSIM_SV_NAME up
	ip netns exec nscl ip link set dev $NSIM_CL_NAME up

	# Enable passive TFO
	ip netns exec nssv sysctl -w net.ipv4.tcp_fastopen=519 > /dev/null

	set +e
}

cleanup_ns()
{
	ip netns del nscl
	ip netns del nssv
}

###
### Code start
###

modprobe netdevsim

# linking

echo $NSIM_SV_ID > $NSIM_DEV_SYS_NEW
echo $NSIM_CL_ID > $NSIM_DEV_SYS_NEW
udevadm settle

setup_ns

NSIM_SV_FD=$((256 + RANDOM % 256))
exec {NSIM_SV_FD}</var/run/netns/nssv
NSIM_SV_IFIDX=$(ip netns exec nssv cat /sys/class/net/$NSIM_SV_NAME/ifindex)

NSIM_CL_FD=$((256 + RANDOM % 256))
exec {NSIM_CL_FD}</var/run/netns/nscl

Annotation

Implementation Notes