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From 4d61a3ea7bc6cbef8d4ea021e4998137cfca1453 Mon Sep 17 00:00:00 2001
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From: Phil Sutter <phil@nwl.cc>
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Date: Thu, 2 Jun 2022 13:44:45 +0200
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Subject: [PATCH] tests: shell: Check overhead in iptables-save and -restore
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Some repeated calls have been reduced recently, assert this in a test
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evaluating strace output.
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Signed-off-by: Phil Sutter <phil@nwl.cc>
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(cherry picked from commit 0416ae5dea134b33e22c97e68b64010d679debe1)
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---
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.../shell/testcases/ipt-save/0007-overhead_0 | 37 +++++++++++++++++++
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1 file changed, 37 insertions(+)
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create mode 100755 iptables/tests/shell/testcases/ipt-save/0007-overhead_0
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diff --git a/iptables/tests/shell/testcases/ipt-save/0007-overhead_0 b/iptables/tests/shell/testcases/ipt-save/0007-overhead_0
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new file mode 100755
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index 0000000000000..b86d71f209471
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--- /dev/null
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+++ b/iptables/tests/shell/testcases/ipt-save/0007-overhead_0
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@@ -0,0 +1,37 @@
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+#!/bin/bash
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+
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+# Test recent performance improvements in iptables-save due to reduced
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+# overhead.
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+
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+strace --version >/dev/null || { echo "skip for missing strace"; exit 0; }
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+
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+RULESET=$(
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+ echo "*filter"
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+ for ((i = 0; i < 100; i++)); do
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+ echo ":mychain$i -"
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+ echo "-A FORWARD -p tcp --dport 22 -j mychain$i"
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+ done
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+ echo "COMMIT"
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+)
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+
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+RESTORE_STRACE=$(strace $XT_MULTI iptables-restore <<< "$RULESET" 2>&1 >/dev/null)
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+SAVE_STRACE=$(strace $XT_MULTI iptables-save 2>&1 >/dev/null)
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+
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+do_grep() { # (name, threshold, pattern)
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+ local cnt=$(grep -c "$3")
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+ [[ $cnt -le $2 ]] && return 0
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+ echo "ERROR: Too many $3 lookups for $1: $cnt > $2"
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+ exit 1
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+}
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+
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+# iptables prefers hard-coded protocol names instead of looking them up first
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+
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+do_grep "$XT_MULTI iptables-restore" 0 /etc/protocols <<< "$RESTORE_STRACE"
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+do_grep "$XT_MULTI iptables-save" 0 /etc/protocols <<< "$SAVE_STRACE"
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+
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+# iptables-nft-save pointlessly checked whether chain jumps are targets
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+
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+do_grep "$XT_MULTI iptables-restore" 10 libxt_ <<< "$RESTORE_STRACE"
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+do_grep "$XT_MULTI iptables-save" 10 libxt_ <<< "$SAVE_STRACE"
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+
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+exit 0
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--
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2.34.1
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