From: Jakub Kicinski Date: Tue, 10 Jun 2025 00:12:45 +0000 (-0700) Subject: selftests: net: add test case for NAT46 looping back dst X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=567766954b2d5d6c29f568ad4382d6351ea48079;p=linux-block.git selftests: net: add test case for NAT46 looping back dst Simple test for crash involving multicast loopback and stale dst. Reuse exising NAT46 program. Reviewed-by: Willem de Bruijn Link: https://patch.msgid.link/20250610001245.1981782-2-kuba@kernel.org Signed-off-by: Jakub Kicinski --- diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile index ea84b88bcb30..ab996bd22a5f 100644 --- a/tools/testing/selftests/net/Makefile +++ b/tools/testing/selftests/net/Makefile @@ -27,6 +27,7 @@ TEST_PROGS += amt.sh TEST_PROGS += unicast_extensions.sh TEST_PROGS += udpgro_fwd.sh TEST_PROGS += udpgro_frglist.sh +TEST_PROGS += nat6to4.sh TEST_PROGS += veth.sh TEST_PROGS += ioam6.sh TEST_PROGS += gro.sh diff --git a/tools/testing/selftests/net/nat6to4.sh b/tools/testing/selftests/net/nat6to4.sh new file mode 100755 index 000000000000..0ee859b622a4 --- /dev/null +++ b/tools/testing/selftests/net/nat6to4.sh @@ -0,0 +1,15 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0 + +NS="ns-peer-$(mktemp -u XXXXXX)" + +ip netns add "${NS}" +ip -netns "${NS}" link set lo up +ip -netns "${NS}" route add default via 127.0.0.2 dev lo + +tc -n "${NS}" qdisc add dev lo ingress +tc -n "${NS}" filter add dev lo ingress prio 4 protocol ip \ + bpf object-file nat6to4.bpf.o section schedcls/egress4/snat4 direct-action + +ip netns exec "${NS}" \ + bash -c 'echo 012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789abc | socat - UDP4-DATAGRAM:224.1.0.1:6666,ip-multicast-loop=1'