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3271a48218
Commit ade446403b ("net: ipv4: do not handle duplicate fragments as
overlapping") changed IPv4 defragmentation so that duplicate fragments,
as well as _some_ fragments completely covered by previously delivered
fragments, do not lead to the whole frag queue being discarded. This
makes the existing ip_defrag selftest flaky.
This patch
* makes sure that negative IPv4 defrag tests generate truly overlapping
fragments that trigger defrag queue drops;
* tests that duplicate IPv4 fragments do not trigger defrag queue drops;
* makes a couple of minor tweaks to the test aimed at increasing its code
coverage and reduce flakiness.
Signed-off-by: Peter Oskolkov <posk@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
47 lines
1.2 KiB
Bash
Executable File
47 lines
1.2 KiB
Bash
Executable File
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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#
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# Run a couple of IP defragmentation tests.
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set +x
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set -e
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readonly NETNS="ns-$(mktemp -u XXXXXX)"
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setup() {
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ip netns add "${NETNS}"
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ip -netns "${NETNS}" link set lo up
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ip netns exec "${NETNS}" sysctl -w net.ipv4.ipfrag_high_thresh=9000000 >/dev/null 2>&1
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ip netns exec "${NETNS}" sysctl -w net.ipv4.ipfrag_low_thresh=7000000 >/dev/null 2>&1
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ip netns exec "${NETNS}" sysctl -w net.ipv4.ipfrag_time=1 >/dev/null 2>&1
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ip netns exec "${NETNS}" sysctl -w net.ipv6.ip6frag_high_thresh=9000000 >/dev/null 2>&1
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ip netns exec "${NETNS}" sysctl -w net.ipv6.ip6frag_low_thresh=7000000 >/dev/null 2>&1
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ip netns exec "${NETNS}" sysctl -w net.ipv6.ip6frag_time=1 >/dev/null 2>&1
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# DST cache can get full with a lot of frags, with GC not keeping up with the test.
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ip netns exec "${NETNS}" sysctl -w net.ipv6.route.max_size=65536 >/dev/null 2>&1
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}
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cleanup() {
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ip netns del "${NETNS}"
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}
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trap cleanup EXIT
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setup
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echo "ipv4 defrag"
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ip netns exec "${NETNS}" ./ip_defrag -4
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echo "ipv4 defrag with overlaps"
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ip netns exec "${NETNS}" ./ip_defrag -4o
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echo "ipv6 defrag"
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ip netns exec "${NETNS}" ./ip_defrag -6
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echo "ipv6 defrag with overlaps"
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ip netns exec "${NETNS}" ./ip_defrag -6o
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echo "all tests done"
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