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4c3510483d
This patch adds several changes to the ip_defrag selftest, to cover new IPv6 defrag behavior: - min IPv6 frag size is now 8 instead of 1280 - new test cases to cover IPv6 defragmentation in nf_conntrack_reasm.c - new "permissive" mode in negative (overlap) tests: netfilter sometimes drops invalid packets without passing them to IPv6 underneath, and thus defragmentation sometimes succeeds when it is expected to fail; so the permissive mode does not fail the test if the correct reassembled datagram is received instead of a timeout. Signed-off-by: Peter Oskolkov <posk@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
63 lines
2.0 KiB
Bash
Executable File
63 lines
2.0 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 "${NETNS}" sysctl -w net.ipv6.ip6frag_time=1 >/dev/null 2>&1
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ip netns exec "${NETNS}" sysctl -w net.netfilter.nf_conntrack_frag6_high_thresh=9000000 >/dev/null 2>&1
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ip netns exec "${NETNS}" sysctl -w net.netfilter.nf_conntrack_frag6_low_thresh=7000000 >/dev/null 2>&1
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ip netns exec "${NETNS}" sysctl -w net.netfilter.nf_conntrack_frag6_timeout=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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# insert an nf_conntrack rule so that the codepath in nf_conntrack_reasm.c taken
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ip netns exec "${NETNS}" ip6tables -A INPUT -m conntrack --ctstate INVALID -j ACCEPT
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echo "ipv6 nf_conntrack defrag"
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ip netns exec "${NETNS}" ./ip_defrag -6
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echo "ipv6 nf_conntrack defrag with overlaps"
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# netfilter will drop some invalid packets, so we run the test in
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# permissive mode: i.e. pass the test if the packet is correctly assembled
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# even if we sent an overlap
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ip netns exec "${NETNS}" ./ip_defrag -6op
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echo "all tests done"
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