1 #!/bin/sh
2 # SPDX-License-Identifier: GPL-2.0
3 #
4 # Run a couple of IP defragmentation tests.
5
6 set +x
7 set -e
8
9 modprobe -q nf_defrag_ipv6
10
11 readonly NETNS="ns-$(mktemp -u XXXXXX)"
12
13 setup() {
14 ip netns add "${NETNS}"
15 ip -netns "${NETNS}" link set lo up
16
17 ip netns exec "${NETNS}" sysctl -w net.ipv4.ipfrag_high_thresh=9000000 >/dev/null 2>&1
18 ip netns exec "${NETNS}" sysctl -w net.ipv4.ipfrag_low_thresh=7000000 >/dev/null 2>&1
19 ip netns exec "${NETNS}" sysctl -w net.ipv4.ipfrag_time=1 >/dev/null 2>&1
20
21 ip netns exec "${NETNS}" sysctl -w net.ipv6.ip6frag_high_thresh=9000000 >/dev/null 2>&1
22 ip netns exec "${NETNS}" sysctl -w net.ipv6.ip6frag_low_thresh=7000000 >/dev/null 2>&1
23 ip netns exec "${NETNS}" sysctl -w net.ipv6.ip6frag_time=1 >/dev/null 2>&1
24
25 ip netns exec "${NETNS}" sysctl -w net.netfilter.nf_conntrack_frag6_high_thresh=9000000 >/dev/null 2>&1
26 ip netns exec "${NETNS}" sysctl -w net.netfilter.nf_conntrack_frag6_low_thresh=7000000 >/dev/null 2>&1
27 ip netns exec "${NETNS}" sysctl -w net.netfilter.nf_conntrack_frag6_timeout=1 >/dev/null 2>&1
28
29 # DST cache can get full with a lot of frags, with GC not keeping up with the test.
30 ip netns exec "${NETNS}" sysctl -w net.ipv6.route.max_size=65536 >/dev/null 2>&1
31 }
32
33 cleanup() {
34 ip netns del "${NETNS}"
35 }
36
37 trap cleanup EXIT
38 setup
39
40 echo "ipv4 defrag"
41 ip netns exec "${NETNS}" ./ip_defrag -4
42
43 echo "ipv4 defrag with overlaps"
44 ip netns exec "${NETNS}" ./ip_defrag -4o
45
46 echo "ipv6 defrag"
47 ip netns exec "${NETNS}" ./ip_defrag -6
48
49 echo "ipv6 defrag with overlaps"
50 ip netns exec "${NETNS}" ./ip_defrag -6o
51
52 # insert an nf_conntrack rule so that the codepath in nf_conntrack_reasm.c taken
53 ip netns exec "${NETNS}" ip6tables -A INPUT -m conntrack --ctstate INVALID -j ACCEPT
54
55 echo "ipv6 nf_conntrack defrag"
56 ip netns exec "${NETNS}" ./ip_defrag -6
57
58 echo "ipv6 nf_conntrack defrag with overlaps"
59 # netfilter will drop some invalid packets, so we run the test in
60 # permissive mode: i.e. pass the test if the packet is correctly assembled
61 # even if we sent an overlap
62 ip netns exec "${NETNS}" ./ip_defrag -6op
63
64 echo "all tests done"
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