tools/testing/selftests/net/ip_defrag.sh

   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"