tests: add basic integration tests

Run shell scripts that start the br daemon, configure it and ensure that
it works as expected. As a starting point, 2 tests are added:

- basic configuration and cli commands that interact with the API
- IP forwarding (with dynamic ARP resolution) using the net_tap driver
  and linux network namespaces.

Signed-off-by: Robin Jarry <[email protected]>

.github/workflows/ci.yml

@@ -17,6 +17,7 @@ jobs:
       - run: |
           dnf install -y \
             make gcc ninja-build meson git gcovr scdoc \
+            iproute \
             libasan \
             libcmocka-devel \
             libedit-devel \

meson.build

@@ -64,14 +64,14 @@ subdir('cli')
 
 install_headers(api_headers, subdir: 'br')
 
-executable(
+br_exe = executable(
   'br', src,
   include_directories: inc,
   dependencies: [dpdk_dep, event_dep, numa_dep, stb_dep],
   install: true,
 )
 
-executable(
+br_cli_exe = executable(
   'br-cli', cli_src,
   include_directories: cli_inc,
   dependencies: [ecoli_dep, smartcols_dep],
@@ -90,5 +90,7 @@ foreach t : tests
     'link_args': t['link_args'] + ['-lgcov'],
     'dependencies': [dpdk_dep, event_dep, numa_dep, ecoli_dep, cmocka_dep, stb_dep],
   }
-  test(name, executable(name, kwargs: t))
+  test(name, executable(name, kwargs: t), suite: 'unit')
 endforeach
+
+subdir('tests')

tests/_init.sh

@@ -0,0 +1,24 @@
+set -e
+
+cleanup() {
+	set +e
+	kill -INT %1
+	wait
+	if [ -r $tmp/cleanup ]; then
+		sh -x $tmp/cleanup
+	fi
+	rm -rf -- "$tmp"
+}
+
+tmp=$(mktemp -d)
+trap cleanup EXIT
+sock=$tmp/br.sock
+
+alias scapy="scapy -HCP"
+alias br="$1 -s $sock"
+alias br-cli="$2 -s $sock"
+
+set -x
+
+br -tv &
+socat FILE:/dev/null UNIX-CONNECT:$sock,retry=3

tests/config_test.sh

@@ -0,0 +1,17 @@
+#!/bin/sh
+
+. $(dirname $0)/_init.sh
+
+br-cli -xe <<EOF
+add interface port p0 devargs net_null0
+add interface port p1 devargs net_null1
+add ip address 10.0.0.1/24 iface p0
+add ip address 10.1.0.1/24 iface p1
+add ip route 0.0.0.0/0 via 10.0.0.2
+show interface all
+show ip route
+show ip nexthop
+show graph dot
+show stats software
+show stats hardware
+EOF

tests/ip_forward_test.sh

@@ -0,0 +1,25 @@
+#!/bin/sh
+
+. $(dirname $0)/_init.sh
+
+p0=brtap0
+p1=brtap1
+
+br-cli -xe <<EOF
+add interface port $p0 devargs net_tap0,iface=$p0
+add interface port $p1 devargs net_tap1,iface=$p1
+add ip address 10.0.0.1/24 iface $p0
+add ip address 10.1.0.1/24 iface $p1
+EOF
+
+for n in 0 1; do
+	ip netns add brns$n
+	echo ip netns del brns$n >> $tmp/cleanup
+	ip link set brtap$n netns brns$n
+	ip -n brns$n link set brtap$n up
+	ip -n brns$n addr add 10.$n.0.2/24 dev brtap$n
+	ip -n brns$n route add default via 10.$n.0.1
+done
+
+ip netns exec brns0 ping -c3 10.1.0.2
+ip netns exec brns1 ping -c3 10.0.0.2

tests/meson.build

@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright (c) 2024 Robin Jarry
+
+sudo = find_program('sudo')
+scapy = find_program('scapy')
+
+test_scripts = files(
+  'config_test.sh',
+  'ip_forward_test.sh',
+)
+
+foreach t : test_scripts
+  name = fs.replace_suffix(t, '')
+  test(name, sudo, args: [t, br_exe, br_cli_exe], suite: 'integration')
+endforeach