Message-ID: <20251126201943.4480-2-fmancera@suse.de>
Date: Wed, 26 Nov 2025 21:19:43 +0100
From: Fernando Fernandez Mancera <fmancera@...e.de>
To: netdev@...r.kernel.org
Cc: linux-kselftest@...r.kernel.org,
	shuah@...nel.org,
	horms@...nel.org,
	pabeni@...hat.com,
	kuba@...nel.org,
	edumazet@...gle.com,
	dsahern@...nel.org,
	davem@...emloft.net,
	Fernando Fernandez Mancera <fmancera@...e.de>
Subject: [PATCH 2/2 net-next] selftests: ipv6_icmp: add tests for ICMPv6 handling

Test ICMPv6 to link local address and local address. In addition, this
test set could be extended to cover more situations in the future.

ICMPv6 to local addresses
    TEST: Ping to link local address                                   [OK]
    TEST: Ping to link local address from ::1                          [OK]
    TEST: Ping to local address                                        [OK]
    TEST: Ping to local address from ::1                               [OK]

Tests passed:   4
Tests failed:   0

Signed-off-by: Fernando Fernandez Mancera <fmancera@...e.de>
---
 tools/testing/selftests/net/Makefile     |   1 +
 tools/testing/selftests/net/ipv6_icmp.sh | 204 +++++++++++++++++++++++
 2 files changed, 205 insertions(+)
 create mode 100755 tools/testing/selftests/net/ipv6_icmp.sh

diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile
index b66ba04f19d9..4d29b47bb084 100644
--- a/tools/testing/selftests/net/Makefile
+++ b/tools/testing/selftests/net/Makefile
@@ -47,6 +47,7 @@ TEST_PROGS := \
 	ip_local_port_range.sh \
 	ipv6_flowlabel.sh \
 	ipv6_force_forwarding.sh \
+	ipv6_icmp.sh \
 	ipv6_route_update_soft_lockup.sh \
 	l2_tos_ttl_inherit.sh \
 	l2tp.sh \
diff --git a/tools/testing/selftests/net/ipv6_icmp.sh b/tools/testing/selftests/net/ipv6_icmp.sh
new file mode 100755
index 000000000000..d4764219007c
--- /dev/null
+++ b/tools/testing/selftests/net/ipv6_icmp.sh
@@ -0,0 +1,204 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+# This test is for checking IPv6 ICMP behavior in different situations.
+source lib.sh
+ret=0
+
+# all tests in this script, can be overridden with -t option
+TESTS="icmpv6_to_local_address"
+
+VERBOSE=0
+PAUSE_ON_FAIL=no
+PAUSE=no
+
+which ping6 > /dev/null 2>&1 && ping6=$(which ping6) || ping6=$(which ping)
+
+log_test()
+{
+	local rc=$1
+	local expected=$2
+	local msg="$3"
+
+	if [ ${rc} -eq ${expected} ]; then
+		printf "    TEST: %-60s  [OK]\n" "${msg}"
+		nsuccess=$((nsuccess+1))
+	else
+		ret=1
+		nfail=$((nfail+1))
+		printf "    TEST: %-60s  [FAIL]\n" "${msg}"
+		if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
+		echo
+			echo "hit enter to continue, 'q' to quit"
+			read a
+			[ "$a" = "q" ] && exit 1
+		fi
+	fi
+
+	if [ "${PAUSE}" = "yes" ]; then
+		echo
+		echo "hit enter to continue, 'q' to quit"
+		read a
+		[ "$a" = "q" ] && exit 1
+	fi
+}
+
+setup()
+{
+	set -e
+	setup_ns ns1
+	IP="$(which ip) -netns $ns1"
+	NS_EXEC="$(which ip) netns exec $ns1"
+
+	$IP link add dummy0 type dummy
+	$IP link set dev dummy0 up
+	$IP -6 address add 2001:db8:1::1/64 dev dummy0 nodad
+	set +e
+}
+
+cleanup()
+{
+	$IP link del dev dummy0 &> /dev/null
+	cleanup_ns $ns1
+}
+
+get_linklocal()
+{
+	local dev=$1
+	local addr
+
+	addr=$($IP -6 -br addr show dev ${dev} | \
+	awk '{
+		for (i = 3; i <= NF; ++i) {
+			if ($i ~ /^fe80/)
+				print $i
+		}
+	}'
+	)
+	addr=${addr/\/*}
+
+	[ -z "$addr" ] && return 1
+
+	echo $addr
+
+	return 0
+}
+
+run_cmd()
+{
+	local cmd="$1"
+	local out
+	local stderr="2>/dev/null"
+
+	if [ "$VERBOSE" = "1" ]; then
+		printf "    COMMAND: $cmd\n"
+		stderr=
+	fi
+
+	out=$(eval $cmd $stderr)
+	rc=$?
+	if [ "$VERBOSE" = "1" -a -n "$out" ]; then
+		echo "    $out"
+	fi
+
+	[ "$VERBOSE" = "1" ] && echo
+
+	return $rc
+}
+
+icmpv6_to_local_address()
+{
+	local rc
+
+	echo
+	echo "ICMPv6 to local addresses"
+
+	setup
+
+	local lldummy=$(get_linklocal dummy0)
+
+	if [ -z "$lldummy" ]; then
+		echo "Failed to get link local address for dummy0"
+		return 1
+	fi
+
+	# ping6 to link local address
+	run_cmd "$NS_EXEC ${ping6} -c 3 $lldummy%dummy0"
+	log_test $? 0 "Ping to link local address"
+
+	# ping6 to link local address from localhost (::1)
+	run_cmd "$NS_EXEC ${ping6} -c 3 -I ::1 $lldummy%dummy0"
+	log_test $? 0 "Ping to link local address from ::1"
+
+	# ping6 to local address
+	run_cmd "$NS_EXEC ${ping6} -c 3 2001:db8:1::1"
+	log_test $? 0 "Ping to local address"
+
+	# ping6 to local address from localhost (::1)
+	run_cmd "$NS_EXEC ${ping6} -c 3 -I ::1 2001:db8:1::1"
+	log_test $? 0 "Ping to local address from ::1"
+}
+
+################################################################################
+# usage
+
+usage()
+{
+	cat <<EOF
+usage: ${0##*/} OPTS
+
+    -t <test>   Test(s) to run (default: all)
+                (options: $TESTS)
+    -p          Pause on fail
+    -P          Pause after each test before cleanup
+    -v          Verbose mode (show commands and output)
+EOF
+}
+
+################################################################################
+# main
+
+trap cleanup EXIT
+
+while getopts :t:pPhv o
+do
+	case $o in
+		t) TESTS=$OPTARG;;
+		p) PAUSE_ON_FAIL=yes;;
+		P) PAUSE=yes;;
+		v) VERBOSE=$(($VERBOSE + 1));;
+		h) usage; exit 0;;
+		*) usage; exit 1;;
+	esac
+done
+
+[ "${PAUSE}" = "yes" ] && PAUSE_ON_FAIL=no
+
+if [ "$(id -u)" -ne 0 ];then
+	echo "SKIP: Need root privileges"
+	exit $ksft_skip;
+fi
+
+if [ ! -x "$(command -v ip)" ]; then
+	echo "SKIP: Could not run test without ip tool"
+	exit $ksft_skip
+fi
+
+# start clean
+cleanup &> /dev/null
+
+for t in $TESTS
+do
+	case $t in
+	icmpv6_to_local_address)	icmpv6_to_local_address;;
+
+	help) echo "Test names: $TESTS"; exit 0;;
+	esac
+done
+
+if [ "$TESTS" != "none" ]; then
+	printf "\nTests passed: %3d\n" ${nsuccess}
+	printf "Tests failed: %3d\n" ${nfail}
+fi
+
+exit $ret
-- 
2.51.1

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