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Mon, 14 Sep 2026 19:03:58 -0700 (PDT) From: Chris J Arges Date: Mon, 14 Sep 2026 21:03:37 -0500 Subject: [PATCH net-next v2 3/3] selftests: net: cover IPv6 uncached route device mismatch Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260914-hash-bucket-route-lists-v2-3-29f6297d8a5a@cloudflare.com> References: <20260914-hash-bucket-route-lists-v2-0-29f6297d8a5a@cloudflare.com> In-Reply-To: <20260914-hash-bucket-route-lists-v2-0-29f6297d8a5a@cloudflare.com> To: David Ahern , Ido Schimmel , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Shuah Khan Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, kernel-team@cloudflare.com, Chris J Arges X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=openssh-sha256; t=1789437828; l=2338; i=carges@cloudflare.com; h=from:subject:message-id; bh=8WdFP1v7/Oa+dKIJynboqHB29B7wDjj6AhOsc16jvtI=; b=U1NIU0lHAAAAAQAAADMAAAALc3NoLWVkMjU1MTkAAAAgaxY1IIT5oTohBZJmhnVgJo2HsM7Sv 9I0LdJCgpeGX6gAAAAGcGF0YXR0AAAAAAAAAAZzaGE1MTIAAABTAAAAC3NzaC1lZDI1NTE5AAAA QB1uSHqNTuHSEUu0oOnVIk7OUTk3RZzaswZwmFCmorRKp9gGkFSsUhv6PRzmEUm+JAD+57TJR82 YoQmqb3O9bwE= X-Developer-Key: i=carges@cloudflare.com; a=openssh; fpr=SHA256:Cun99EBiH0EV7wvmfTBF9eDrld2NJx+aD4ScWZ45Q5M Local IPv6 routes through a VRF can use the VRF as dst.dev while retaining the VRF member interface in rt6i_idev. Exercise device teardown while such uncached routes are retained by a delayed qdisc. Reuse the existing VRF topology and msg_zerocopy raw-header sender, and verify route creation, qdisc retention, and prompt interface deletion. Signed-off-by: Chris J Arges --- tools/testing/selftests/net/vrf-xfrm-tests.sh | 35 +++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/tools/testing/selftests/net/vrf-xfrm-tests.sh b/tools/testing/selftests/net/vrf-xfrm-tests.sh index b64dd891699d..4f409d135a99 100755 --- a/tools/testing/selftests/net/vrf-xfrm-tests.sh +++ b/tools/testing/selftests/net/vrf-xfrm-tests.sh @@ -385,6 +385,37 @@ run_tests() cleanup_xfrm_dev } +test_ipv6_uncached_mismatch() +{ + local sender_pid + local backlog + local rc + + # A local route through a VRF uses the VRF as dst.dev while retaining + # the VRF member interface in rt6i_idev. Raw header sends create uncached + # routes, and netem keeps them referenced while the interface is deleted. + run_cmd_host1 tc qdisc replace dev ${VRF} root netem limit 1 delay 10s + ip -6 -netns "$host1" route add local ${HOST1_6}/128 dev eth0 + ip netns exec "$host1" ./msg_zerocopy -6 \ + -S ${HOST1_6} -D ${HOST1_6} -s 1200 -t 0 raw_hdrincl \ + >/dev/null 2>&1 & + sender_pid=$! + wait "$sender_pid" + rc=$? + log_test $rc 0 "Create uncached IPv6 routes with mismatched devices" + [ $rc -ne 0 ] && return + + backlog=$(ip netns exec "$host1" tc -s qdisc show dev ${VRF}) + if ! echo "$backlog" | grep -Eq 'backlog .* [1-9][0-9]*p'; then + log_test 1 0 "Retain uncached IPv6 routes in VRF qdisc" + return + fi + log_test 0 0 "Retain uncached IPv6 routes in VRF qdisc" + + run_cmd_host1 timeout 2 ip link del eth0 + log_test $? 0 "Flush uncached IPv6 routes with mismatched devices" +} + ################################################################################ # usage @@ -425,6 +456,10 @@ echo echo "netem qdisc on VRF device" run_tests +echo +echo "Uncached IPv6 route with mismatched devices" +test_ipv6_uncached_mismatch + printf "\nTests passed: %3d\n" ${nsuccess} printf "Tests failed: %3d\n" ${nfail} -- 2.43.0