[PATCH net-next 01/38] selftests/net: add lib.sh

[Hangbin Liu <liuhangbin@gmail.com>]

Add a lib.sh for net selftests. This file can be used to define commonly
used variables and functions.

Add function setup_ns() for user to create unique namespaces with given
prefix name.

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
---
 tools/testing/selftests/net/Makefile |  2 +-
 tools/testing/selftests/net/lib.sh   | 98 ++++++++++++++++++++++++++++
 2 files changed, 99 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/net/lib.sh

diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile
index 9274edfb76ff..14bd68da7466 100644
--- a/tools/testing/selftests/net/Makefile
+++ b/tools/testing/selftests/net/Makefile
@@ -54,7 +54,7 @@ TEST_PROGS += ip_local_port_range.sh
 TEST_PROGS += rps_default_mask.sh
 TEST_PROGS += big_tcp.sh
 TEST_PROGS_EXTENDED := in_netns.sh setup_loopback.sh setup_veth.sh
-TEST_PROGS_EXTENDED += toeplitz_client.sh toeplitz.sh
+TEST_PROGS_EXTENDED += toeplitz_client.sh toeplitz.sh lib.sh
 TEST_GEN_FILES =  socket nettest
 TEST_GEN_FILES += psock_fanout psock_tpacket msg_zerocopy reuseport_addr_any
 TEST_GEN_FILES += tcp_mmap tcp_inq psock_snd txring_overwrite
diff --git a/tools/testing/selftests/net/lib.sh b/tools/testing/selftests/net/lib.sh
new file mode 100644
index 000000000000..239ab2beb438
--- /dev/null
+++ b/tools/testing/selftests/net/lib.sh
@@ -0,0 +1,98 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+##############################################################################
+# Defines
+
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+# namespace list created by setup_ns
+NS_LIST=""
+
+##############################################################################
+# Helpers
+busywait()
+{
+	local timeout=$1; shift
+
+	local start_time="$(date -u +%s%3N)"
+	while true
+	do
+		local out
+		out=$($@)
+		local ret=$?
+		if ((!ret)); then
+			echo -n "$out"
+			return 0
+		fi
+
+		local current_time="$(date -u +%s%3N)"
+		if ((current_time - start_time > timeout)); then
+			echo -n "$out"
+			return 1
+		fi
+	done
+}
+
+cleanup_ns()
+{
+	local ns=""
+	local errexit=0
+
+	# disable errexit temporary
+	if [[ $- =~ "e" ]]; then
+		errexit=1
+		set +e
+	fi
+
+	for ns in "$@"; do
+		ip netns delete "${ns}" &> /dev/null
+		busywait 2 "ip netns list | grep -vq $1" &> /dev/null
+		if ip netns list | grep -q $1; then
+			echo "Failed to remove namespace $1"
+			return $ksft_skip
+		fi
+	done
+
+	[ $errexit -eq 1 ] && set -e
+	return 0
+}
+
+# By default, remove all netns before EXIT.
+cleanup_all_ns()
+{
+	cleanup_ns $NS_LIST
+}
+trap cleanup_all_ns EXIT
+
+# setup netns with given names as prefix. e.g
+# setup_ns local remote
+setup_ns()
+{
+	local ns=""
+	# the ns list we created in this call
+	local ns_list=""
+	while [ -n "$1" ]; do
+		# Some test may setup/remove same netns multi times
+		if unset $1 2> /dev/null; then
+			ns="${1,,}-$(mktemp -u XXXXXX)"
+			eval readonly $1=$ns
+		else
+			eval ns='$'$1
+			cleanup_ns $ns
+
+		fi
+
+		ip netns add $ns
+		if ! ip netns list | grep -q $ns; then
+			echo "Failed to create namespace $1"
+			cleanup_ns $ns_list
+			return $ksft_skip
+		fi
+		ip -n $ns link set lo up
+		ns_list="$ns_list $ns"
+
+		shift
+	done
+	NS_LIST="$NS_LIST $ns_list"
+}
-- 
2.41.0