[PATCH net v2] selftests: net: fib-onlink-tests: Convert to use namespaces by default

13 Jan 2026

Currently, the test breaks if the SUT already has a default route
configured for IPv6. Fix by avoiding the use of the default namespace.
Fixes: 4ed591c8ab44 ("net/ipv6: Allow onlink routes to have a device mismatch if it is the default route")
Suggested-by: Fernando Fernandez Mancera fmancera@suse.de
Signed-off-by: Ricardo B. Marlière rbm@suse.com
---
Changes in v2:
- Don't use the default namespace, instead of simply increasing the metric
- Link to v1: https://lore.kernel.org/r/20251218-rbm-selftests-net-fib-onlink-v1-1-96302a5...
---
 tools/testing/selftests/net/fib-onlink-tests.sh | 71 +++++++++++--------------
 1 file changed, 30 insertions(+), 41 deletions(-)

diff --git a/tools/testing/selftests/net/fib-onlink-tests.sh b/tools/testing/selftests/net/fib-onlink-tests.sh
index ec2d6ceb1f08..c01be076b210 100755
--- a/tools/testing/selftests/net/fib-onlink-tests.sh
+++ b/tools/testing/selftests/net/fib-onlink-tests.sh
@@ -120,7 +120,7 @@ log_subsection()
run_cmd()
 {
-	local cmd="$*"
+	local cmd="$1"
    local out
    local rc
@@ -145,7 +145,7 @@ get_linklocal()
    local pfx
    local addr
-	addr=$(${pfx} ip -6 -br addr show dev ${dev} | \
+	addr=$(${pfx} ${IP} -6 -br addr show dev ${dev} | \
    awk '{
    	for (i = 3; i <= NF; ++i) {
    		if ($i ~ /^fe80/)
@@ -173,58 +173,48 @@ setup()
set -e
-	# create namespace
-	setup_ns PEER_NS
+	# create namespaces
+	setup_ns ns1
+	IP="ip -netns $ns1"
+	setup_ns ns2
# add vrf table
-	ip li add ${VRF} type vrf table ${VRF_TABLE}
-	ip li set ${VRF} up
-	ip ro add table ${VRF_TABLE} unreachable default metric 8192
-	ip -6 ro add table ${VRF_TABLE} unreachable default metric 8192
+	${IP} li add ${VRF} type vrf table ${VRF_TABLE}
+	${IP} li set ${VRF} up
+	${IP} ro add table ${VRF_TABLE} unreachable default metric 8192
+	${IP} -6 ro add table ${VRF_TABLE} unreachable default metric 8192
# create test interfaces
-	ip li add ${NETIFS[p1]} type veth peer name ${NETIFS[p2]}
-	ip li add ${NETIFS[p3]} type veth peer name ${NETIFS[p4]}
-	ip li add ${NETIFS[p5]} type veth peer name ${NETIFS[p6]}
-	ip li add ${NETIFS[p7]} type veth peer name ${NETIFS[p8]}
+	${IP} li add ${NETIFS[p1]} type veth peer name ${NETIFS[p2]}
+	${IP} li add ${NETIFS[p3]} type veth peer name ${NETIFS[p4]}
+	${IP} li add ${NETIFS[p5]} type veth peer name ${NETIFS[p6]}
+	${IP} li add ${NETIFS[p7]} type veth peer name ${NETIFS[p8]}
# enslave vrf interfaces
    for n in 5 7; do
-		ip li set ${NETIFS[p${n}]} vrf ${VRF}
+		${IP} li set ${NETIFS[p${n}]} vrf ${VRF}
    done
# add addresses
    for n in 1 3 5 7; do
-		ip li set ${NETIFS[p${n}]} up
-		ip addr add ${V4ADDRS[p${n}]}/24 dev ${NETIFS[p${n}]}
-		ip addr add ${V6ADDRS[p${n}]}/64 dev ${NETIFS[p${n}]} nodad
+		${IP} li set ${NETIFS[p${n}]} up
+		${IP} addr add ${V4ADDRS[p${n}]}/24 dev ${NETIFS[p${n}]}
+		${IP} addr add ${V6ADDRS[p${n}]}/64 dev ${NETIFS[p${n}]} nodad
    done
# move peer interfaces to namespace and add addresses
    for n in 2 4 6 8; do
-		ip li set ${NETIFS[p${n}]} netns ${PEER_NS} up
-		ip -netns ${PEER_NS} addr add ${V4ADDRS[p${n}]}/24 dev ${NETIFS[p${n}]}
-		ip -netns ${PEER_NS} addr add ${V6ADDRS[p${n}]}/64 dev ${NETIFS[p${n}]} nodad
+		${IP} li set ${NETIFS[p${n}]} netns ${ns2} up
+		ip -netns $ns2 addr add ${V4ADDRS[p${n}]}/24 dev ${NETIFS[p${n}]}
+		ip -netns $ns2 addr add ${V6ADDRS[p${n}]}/64 dev ${NETIFS[p${n}]} nodad
    done
-	ip -6 ro add default via ${V6ADDRS[p3]/::[0-9]/::64}
-	ip -6 ro add table ${VRF_TABLE} default via ${V6ADDRS[p7]/::[0-9]/::64}
+	${IP} -6 ro add default via ${V6ADDRS[p3]/::[0-9]/::64}
+	${IP} -6 ro add table ${VRF_TABLE} default via ${V6ADDRS[p7]/::[0-9]/::64}
set +e
 }
-cleanup()
-{
-	# make sure we start from a clean slate
-	cleanup_ns ${PEER_NS} 2>/dev/null
-	for n in 1 3 5 7; do
-		ip link del ${NETIFS[p${n}]} 2>/dev/null
-	done
-	ip link del ${VRF} 2>/dev/null
-	ip ro flush table ${VRF_TABLE}
-	ip -6 ro flush table ${VRF_TABLE}
-}
-
 ################################################################################
 # IPv4 tests
 #
@@ -241,7 +231,7 @@ run_ip()
    # dev arg may be empty
    [ -n "${dev}" ] && dev="dev ${dev}"
-	run_cmd ip ro add table "${table}" "${prefix}"/32 via "${gw}" "${dev}" onlink
+	run_cmd "${IP} ro add table ${table} ${prefix}/32 via ${gw} ${dev} onlink"
    log_test $? ${exp_rc} "${desc}"
 }
@@ -257,8 +247,8 @@ run_ip_mpath()
    # dev arg may be empty
    [ -n "${dev}" ] && dev="dev ${dev}"
-	run_cmd ip ro add table "${table}" "${prefix}"/32 \
-		nexthop via ${nh1} nexthop via ${nh2}
+	run_cmd "${IP} ro add table ${table} ${prefix}/32 \
+		nexthop via ${nh1} nexthop via ${nh2}"
    log_test $? ${exp_rc} "${desc}"
 }
@@ -339,7 +329,7 @@ run_ip6()
    # dev arg may be empty
    [ -n "${dev}" ] && dev="dev ${dev}"
-	run_cmd ip -6 ro add table "${table}" "${prefix}"/128 via "${gw}" "${dev}" onlink
+	run_cmd "${IP} -6 ro add table ${table} ${prefix}/128 via ${gw} ${dev} onlink"
    log_test $? ${exp_rc} "${desc}"
 }
@@ -353,8 +343,8 @@ run_ip6_mpath()
    local exp_rc="$6"
    local desc="$7"
-	run_cmd ip -6 ro add table "${table}" "${prefix}"/128 "${opts}" \
-		nexthop via ${nh1} nexthop via ${nh2}
+	run_cmd "${IP} -6 ro add table ${table} ${prefix}/128 ${opts} \
+		nexthop via ${nh1} nexthop via ${nh2}"
    log_test $? ${exp_rc} "${desc}"
 }
@@ -491,10 +481,9 @@ do
    esac
 done
-cleanup
 setup
 run_onlink_tests
-cleanup
+cleanup_ns ${ns1} ${ns2}
if [ "$TESTS" != "none" ]; then
    printf "\nTests passed: %3d\n" ${nsuccess}
---
base-commit: 50e194b6da721e4fa1fc6ebcf5969803c214929a
change-id: 20260107-selftests-net-fib-onlink-73bd8643ad3e
Best regards,
-- 
Ricardo B. Marlière rbm@suse.com



    

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

[PATCH net v2] selftests: net: fib-onlink-tests: Convert to use namespaces by default