Patch "selftests: mptcp: join: use 'iptables-legacy' if available" has been added to the 6.3-stable tree

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This is a note to let you know that I've just added the patch titled

    selftests: mptcp: join: use 'iptables-legacy' if available

to the 6.3-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     selftests-mptcp-join-use-iptables-legacy-if-available.patch
and it can be found in the queue-6.3 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 0c4cd3f86a40028845ad6f8af5b37165666404cd Mon Sep 17 00:00:00 2001
From: Matthieu Baerts <matthieu.baerts@xxxxxxxxxxxx>
Date: Sat, 10 Jun 2023 18:11:37 +0200
Subject: selftests: mptcp: join: use 'iptables-legacy' if available

From: Matthieu Baerts <matthieu.baerts@xxxxxxxxxxxx>

commit 0c4cd3f86a40028845ad6f8af5b37165666404cd upstream.

IPTables commands using 'iptables-nft' fail on old kernels, at least
5.15 because it doesn't see the default IPTables chains:

  $ iptables -L
  iptables/1.8.2 Failed to initialize nft: Protocol not supported

As a first step before switching to NFTables, we can use iptables-legacy
if available.

Link: https://github.com/multipath-tcp/mptcp_net-next/issues/368
Fixes: 8d014eaa9254 ("selftests: mptcp: add ADD_ADDR timeout test case")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Matthieu Baerts <matthieu.baerts@xxxxxxxxxxxx>
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 tools/testing/selftests/net/mptcp/mptcp_join.sh |   18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

--- a/tools/testing/selftests/net/mptcp/mptcp_join.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh
@@ -25,6 +25,8 @@ capout=""
 ns1=""
 ns2=""
 ksft_skip=4
+iptables="iptables"
+ip6tables="ip6tables"
 timeout_poll=30
 timeout_test=$((timeout_poll * 2 + 1))
 capture=0
@@ -146,7 +148,11 @@ check_tools()
 		exit $ksft_skip
 	fi
 
-	if ! iptables -V &> /dev/null; then
+	# Use the legacy version if available to support old kernel versions
+	if iptables-legacy -V &> /dev/null; then
+		iptables="iptables-legacy"
+		ip6tables="ip6tables-legacy"
+	elif ! iptables -V &> /dev/null; then
 		echo "SKIP: Could not run all tests without iptables tool"
 		exit $ksft_skip
 	fi
@@ -247,9 +253,9 @@ reset_with_add_addr_timeout()
 
 	reset "${1}" || return 1
 
-	tables="iptables"
+	tables="${iptables}"
 	if [ $ip -eq 6 ]; then
-		tables="ip6tables"
+		tables="${ip6tables}"
 	fi
 
 	ip netns exec $ns1 sysctl -q net.mptcp.add_addr_timeout=1
@@ -314,9 +320,9 @@ reset_with_fail()
 	local ip="${3:-4}"
 	local tables
 
-	tables="iptables"
+	tables="${iptables}"
 	if [ $ip -eq 6 ]; then
-		tables="ip6tables"
+		tables="${ip6tables}"
 	fi
 
 	ip netns exec $ns2 $tables \
@@ -704,7 +710,7 @@ filter_tcp_from()
 	local src="${2}"
 	local target="${3}"
 
-	ip netns exec "${ns}" iptables -A INPUT -s "${src}" -p tcp -j "${target}"
+	ip netns exec "${ns}" ${iptables} -A INPUT -s "${src}" -p tcp -j "${target}"
 }
 
 do_transfer()


Patches currently in stable-queue which might be from matthieu.baerts@xxxxxxxxxxxx are

queue-6.3/selftests-mptcp-join-fix-shellcheck-warnings.patch
queue-6.3/selftests-mptcp-join-support-rm_addr-for-used-endpoints-or-not.patch
queue-6.3/selftests-mptcp-pm-nl-skip-fullmesh-flag-checks-if-not-supported.patch
queue-6.3/selftests-mptcp-lib-skip-if-missing-symbol.patch
queue-6.3/selftests-mptcp-join-skip-fullmesh-flag-tests-if-not-supported.patch
queue-6.3/selftests-mptcp-connect-skip-tfo-tests-if-not-supported.patch
queue-6.3/selftests-mptcp-join-skip-fastclose-tests-if-not-supported.patch
queue-6.3/selftests-mptcp-remove-duplicated-entries-in-usage.patch
queue-6.3/selftests-mptcp-sockopt-skip-getsockopt-checks-if-not-supported.patch
queue-6.3/selftests-mptcp-join-skip-backup-if-set-flag-on-id-not-supported.patch
queue-6.3/selftests-mptcp-join-skip-mixed-tests-if-not-supported.patch
queue-6.3/selftests-mptcp-userspace-pm-skip-if-ip-tool-is-unavailable.patch
queue-6.3/selftests-mptcp-join-helpers-to-skip-tests.patch
queue-6.3/selftests-mptcp-lib-skip-if-not-below-kernel-version.patch
queue-6.3/selftests-mptcp-userspace-pm-skip-if-not-supported.patch
queue-6.3/selftests-mptcp-join-uniform-listener-tests.patch
queue-6.3/selftests-mptcp-diag-skip-listen-tests-if-not-supported.patch
queue-6.3/selftests-mptcp-sockopt-skip-tcp_inq-checks-if-not-supported.patch
queue-6.3/selftests-mptcp-join-skip-test-if-iptables-tc-cmds-fail.patch
queue-6.3/selftests-mptcp-join-skip-implicit-tests-if-not-supported.patch
queue-6.3/selftests-mptcp-userspace-pm-skip-pm-listener-events-tests-if-unavailable.patch
queue-6.3/selftests-mptcp-join-skip-fail-tests-if-not-supported.patch
queue-6.3/selftests-mptcp-sockopt-relax-expected-returned-size.patch
queue-6.3/selftests-mptcp-pm-nl-remove-hardcoded-default-limits.patch
queue-6.3/selftests-mptcp-join-skip-check-if-mib-counter-not-supported.patch
queue-6.3/selftests-mptcp-diag-skip-inuse-tests-if-not-supported.patch
queue-6.3/selftests-mptcp-join-use-iptables-legacy-if-available.patch
queue-6.3/selftests-mptcp-join-support-local-endpoint-being-tracked-or-not.patch
queue-6.3/selftests-mptcp-join-skip-userspace-pm-tests-if-not-supported.patch
queue-6.3/selftests-mptcp-connect-skip-transp-tests-if-not-supported.patch
queue-6.3/selftests-mptcp-join-skip-mpc-backups-tests-if-not-supported.patch
queue-6.3/selftests-mptcp-join-skip-pm-listener-tests-if-not-supported.patch
queue-6.3/selftests-mptcp-connect-skip-disconnect-tests-if-not-supported.patch



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