tools/testing/selftests/net/netfilter/bridge_brouter.sh

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

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/net/netfilter/bridge_brouter.sh
Extension
.sh
Size
3782 bytes
Lines
121
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
#
# This test is for bridge 'brouting', i.e. make some packets being routed
# rather than getting bridged even though they arrive on interface that is
# part of a bridge.

#           eth0    br0     eth0
# setup is: ns1 <-> nsbr <-> ns2

source lib.sh

if ! ebtables -V > /dev/null 2>&1;then
	echo "SKIP: Could not run test without ebtables"
	exit $ksft_skip
fi

cleanup() {
	cleanup_all_ns
}

trap cleanup EXIT

setup_ns nsbr ns1 ns2

if ! ip link add veth0 netns "$nsbr" type veth peer name eth0 netns "$ns1"; then
	echo "SKIP: Can't create veth device"
	exit $ksft_skip
fi
ip link add veth1 netns "$nsbr" type veth peer name eth0 netns "$ns2"

if ! ip -net "$nsbr" link add br0 type bridge; then
	echo "SKIP: Can't create bridge br0"
	exit $ksft_skip
fi

ip -net "$nsbr" link set veth0 up
ip -net "$nsbr" link set veth1 up

ip -net "$nsbr" link set veth0 master br0
ip -net "$nsbr" link set veth1 master br0
ip -net "$nsbr" link set br0 up
ip -net "$nsbr" addr add 10.0.0.1/24 dev br0

# place both in same subnet, ${ns1} and ${ns2} connected via ${nsbr}:br0
ip -net "$ns1" link set eth0 up
ip -net "$ns2" link set eth0 up
ip -net "$ns1" addr add 10.0.0.11/24 dev eth0
ip -net "$ns2" addr add 10.0.0.12/24 dev eth0

test_ebtables_broute()
{
	# redirect is needed so the dstmac is rewritten to the bridge itself,
	# ip stack won't process OTHERHOST (foreign unicast mac) packets.
	if ! ip netns exec "$nsbr" ebtables -t broute -A BROUTING -p ipv4 --ip-protocol icmp -j redirect --redirect-target=DROP; then
		echo "SKIP: Could not add ebtables broute redirect rule"
		return $ksft_skip
	fi

	ip netns exec "$nsbr" sysctl -q net.ipv4.conf.veth0.forwarding=0

	# ping net${ns1}, expected to not work (ip forwarding is off)
	if ip netns exec "$ns1" ping -q -c 1 10.0.0.12 -W 0.5 > /dev/null 2>&1; then
		echo "ERROR: ping works, should have failed" 1>&2
		return 1
	fi

	# enable forwarding on both interfaces.
	# neither needs an ip address, but at least the bridge needs
	# an ip address in same network segment as ${ns1} and ${ns2} (${nsbr}
	# needs to be able to determine route for to-be-forwarded packet).

Annotation

Implementation Notes