tools/testing/selftests/netfilter/conntrack_sctp_collision.sh

   1 #!/bin/bash
   2 # SPDX-License-Identifier: GPL-2.0
   3 #
   4 # Testing For SCTP COLLISION SCENARIO as Below:
   5 #
   6 #   14:35:47.655279 IP CLIENT_IP.PORT > SERVER_IP.PORT: sctp (1) [INIT] [init tag: 2017837359]
   7 #   14:35:48.353250 IP SERVER_IP.PORT > CLIENT_IP.PORT: sctp (1) [INIT] [init tag: 1187206187]
   8 #   14:35:48.353275 IP CLIENT_IP.PORT > SERVER_IP.PORT: sctp (1) [INIT ACK] [init tag: 2017837359]
   9 #   14:35:48.353283 IP SERVER_IP.PORT > CLIENT_IP.PORT: sctp (1) [COOKIE ECHO]
  10 #   14:35:48.353977 IP CLIENT_IP.PORT > SERVER_IP.PORT: sctp (1) [COOKIE ACK]
  11 #   14:35:48.855335 IP SERVER_IP.PORT > CLIENT_IP.PORT: sctp (1) [INIT ACK] [init tag: 164579970]
  12 #
  13 # TOPO: SERVER_NS (link0)<--->(link1) ROUTER_NS (link2)<--->(link3) CLIENT_NS
  14
  15 CLIENT_NS=$(mktemp -u client-XXXXXXXX)
  16 CLIENT_IP="198.51.200.1"
  17 CLIENT_PORT=1234
  18
  19 SERVER_NS=$(mktemp -u server-XXXXXXXX)
  20 SERVER_IP="198.51.100.1"
  21 SERVER_PORT=1234
  22
  23 ROUTER_NS=$(mktemp -u router-XXXXXXXX)
  24 CLIENT_GW="198.51.200.2"
  25 SERVER_GW="198.51.100.2"
  26
  27 # setup the topo
  28 setup() {
  29         ip net add $CLIENT_NS
  30         ip net add $SERVER_NS
  31         ip net add $ROUTER_NS
  32         ip -n $SERVER_NS link add link0 type veth peer name link1 netns $ROUTER_NS
  33         ip -n $CLIENT_NS link add link3 type veth peer name link2 netns $ROUTER_NS
  34
  35         ip -n $SERVER_NS link set link0 up
  36         ip -n $SERVER_NS addr add $SERVER_IP/24 dev link0
  37         ip -n $SERVER_NS route add $CLIENT_IP dev link0 via $SERVER_GW
  38
  39         ip -n $ROUTER_NS link set link1 up
  40         ip -n $ROUTER_NS link set link2 up
  41         ip -n $ROUTER_NS addr add $SERVER_GW/24 dev link1
  42         ip -n $ROUTER_NS addr add $CLIENT_GW/24 dev link2
  43         ip net exec $ROUTER_NS sysctl -wq net.ipv4.ip_forward=1
  44
  45         ip -n $CLIENT_NS link set link3 up
  46         ip -n $CLIENT_NS addr add $CLIENT_IP/24 dev link3
  47         ip -n $CLIENT_NS route add $SERVER_IP dev link3 via $CLIENT_GW
  48
  49         # simulate the delay on OVS upcall by setting up a delay for INIT_ACK with
  50         # tc on $SERVER_NS side
  51         tc -n $SERVER_NS qdisc add dev link0 root handle 1: htb
  52         tc -n $SERVER_NS class add dev link0 parent 1: classid 1:1 htb rate 100mbit
  53         tc -n $SERVER_NS filter add dev link0 parent 1: protocol ip u32 match ip protocol 132 \
  54                 0xff match u8 2 0xff at 32 flowid 1:1
  55         tc -n $SERVER_NS qdisc add dev link0 parent 1:1 handle 10: netem delay 1200ms
  56
  57         # simulate the ctstate check on OVS nf_conntrack
  58         ip net exec $ROUTER_NS iptables -A FORWARD -m state --state INVALID,UNTRACKED -j DROP
  59         ip net exec $ROUTER_NS iptables -A INPUT -p sctp -j DROP
  60
  61         # use a smaller number for assoc's max_retrans to reproduce the issue
  62         modprobe sctp
  63         ip net exec $CLIENT_NS sysctl -wq net.sctp.association_max_retrans=3
  64 }
  65
  66 cleanup() {
  67         ip net exec $CLIENT_NS pkill sctp_collision 2>&1 >/dev/null
  68         ip net exec $SERVER_NS pkill sctp_collision 2>&1 >/dev/null
  69         ip net del "$CLIENT_NS"
  70         ip net del "$SERVER_NS"
  71         ip net del "$ROUTER_NS"
  72 }
  73
  74 do_test() {
  75         ip net exec $SERVER_NS ./sctp_collision server \
  76                 $SERVER_IP $SERVER_PORT $CLIENT_IP $CLIENT_PORT &
  77         ip net exec $CLIENT_NS ./sctp_collision client \
  78                 $CLIENT_IP $CLIENT_PORT $SERVER_IP $SERVER_PORT
  79 }
  80
  81 # NOTE: one way to work around the issue is set a smaller hb_interval
  82 # ip net exec $CLIENT_NS sysctl -wq net.sctp.hb_interval=3500
  83
  84 # run the test case
  85 trap cleanup EXIT
  86 setup && \
  87 echo "Test for SCTP Collision in nf_conntrack:" && \
  88 do_test && echo "PASS!"
  89 exit $?