cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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test_tc_tunnel.sh (7671B)


      1#!/bin/bash
      2# SPDX-License-Identifier: GPL-2.0
      3#
      4# In-place tunneling
      5
      6# must match the port that the bpf program filters on
      7readonly port=8000
      8
      9readonly ns_prefix="ns-$$-"
     10readonly ns1="${ns_prefix}1"
     11readonly ns2="${ns_prefix}2"
     12
     13readonly ns1_v4=192.168.1.1
     14readonly ns2_v4=192.168.1.2
     15readonly ns1_v6=fd::1
     16readonly ns2_v6=fd::2
     17
     18# Must match port used by bpf program
     19readonly udpport=5555
     20# MPLSoverUDP
     21readonly mplsudpport=6635
     22readonly mplsproto=137
     23
     24readonly infile="$(mktemp)"
     25readonly outfile="$(mktemp)"
     26
     27setup() {
     28	ip netns add "${ns1}"
     29	ip netns add "${ns2}"
     30
     31	ip link add dev veth1 mtu 1500 netns "${ns1}" type veth \
     32	      peer name veth2 mtu 1500 netns "${ns2}"
     33
     34	ip netns exec "${ns1}" ethtool -K veth1 tso off
     35
     36	ip -netns "${ns1}" link set veth1 up
     37	ip -netns "${ns2}" link set veth2 up
     38
     39	ip -netns "${ns1}" -4 addr add "${ns1_v4}/24" dev veth1
     40	ip -netns "${ns2}" -4 addr add "${ns2_v4}/24" dev veth2
     41	ip -netns "${ns1}" -6 addr add "${ns1_v6}/64" dev veth1 nodad
     42	ip -netns "${ns2}" -6 addr add "${ns2_v6}/64" dev veth2 nodad
     43
     44	# clamp route to reserve room for tunnel headers
     45	ip -netns "${ns1}" -4 route flush table main
     46	ip -netns "${ns1}" -6 route flush table main
     47	ip -netns "${ns1}" -4 route add "${ns2_v4}" mtu 1450 dev veth1
     48	ip -netns "${ns1}" -6 route add "${ns2_v6}" mtu 1430 dev veth1
     49
     50	sleep 1
     51
     52	dd if=/dev/urandom of="${infile}" bs="${datalen}" count=1 status=none
     53}
     54
     55cleanup() {
     56	ip netns del "${ns2}"
     57	ip netns del "${ns1}"
     58
     59	if [[ -f "${outfile}" ]]; then
     60		rm "${outfile}"
     61	fi
     62	if [[ -f "${infile}" ]]; then
     63		rm "${infile}"
     64	fi
     65
     66	if [[ -n $server_pid ]]; then
     67		kill $server_pid 2> /dev/null
     68	fi
     69}
     70
     71server_listen() {
     72	ip netns exec "${ns2}" nc "${netcat_opt}" -l "${port}" > "${outfile}" &
     73	server_pid=$!
     74	sleep 0.2
     75}
     76
     77client_connect() {
     78	ip netns exec "${ns1}" timeout 2 nc "${netcat_opt}" -w 1 "${addr2}" "${port}" < "${infile}"
     79	echo $?
     80}
     81
     82verify_data() {
     83	wait "${server_pid}"
     84	server_pid=
     85	# sha1sum returns two fields [sha1] [filepath]
     86	# convert to bash array and access first elem
     87	insum=($(sha1sum ${infile}))
     88	outsum=($(sha1sum ${outfile}))
     89	if [[ "${insum[0]}" != "${outsum[0]}" ]]; then
     90		echo "data mismatch"
     91		exit 1
     92	fi
     93}
     94
     95set -e
     96
     97# no arguments: automated test, run all
     98if [[ "$#" -eq "0" ]]; then
     99	echo "ipip"
    100	$0 ipv4 ipip none 100
    101
    102	echo "ip6ip6"
    103	$0 ipv6 ip6tnl none 100
    104
    105	echo "sit"
    106	$0 ipv6 sit none 100
    107
    108	echo "ip4 vxlan"
    109	$0 ipv4 vxlan eth 2000
    110
    111	echo "ip6 vxlan"
    112	$0 ipv6 ip6vxlan eth 2000
    113
    114	for mac in none mpls eth ; do
    115		echo "ip gre $mac"
    116		$0 ipv4 gre $mac 100
    117
    118		echo "ip6 gre $mac"
    119		$0 ipv6 ip6gre $mac 100
    120
    121		echo "ip gre $mac gso"
    122		$0 ipv4 gre $mac 2000
    123
    124		echo "ip6 gre $mac gso"
    125		$0 ipv6 ip6gre $mac 2000
    126
    127		echo "ip udp $mac"
    128		$0 ipv4 udp $mac 100
    129
    130		echo "ip6 udp $mac"
    131		$0 ipv6 ip6udp $mac 100
    132
    133		echo "ip udp $mac gso"
    134		$0 ipv4 udp $mac 2000
    135
    136		echo "ip6 udp $mac gso"
    137		$0 ipv6 ip6udp $mac 2000
    138	done
    139
    140	echo "OK. All tests passed"
    141	exit 0
    142fi
    143
    144if [[ "$#" -ne "4" ]]; then
    145	echo "Usage: $0"
    146	echo "   or: $0 <ipv4|ipv6> <tuntype> <none|mpls|eth> <data_len>"
    147	exit 1
    148fi
    149
    150case "$1" in
    151"ipv4")
    152	readonly addr1="${ns1_v4}"
    153	readonly addr2="${ns2_v4}"
    154	readonly ipproto=4
    155	readonly netcat_opt=-${ipproto}
    156	readonly foumod=fou
    157	readonly foutype=ipip
    158	readonly fouproto=4
    159	readonly fouproto_mpls=${mplsproto}
    160	readonly gretaptype=gretap
    161	;;
    162"ipv6")
    163	readonly addr1="${ns1_v6}"
    164	readonly addr2="${ns2_v6}"
    165	readonly ipproto=6
    166	readonly netcat_opt=-${ipproto}
    167	readonly foumod=fou6
    168	readonly foutype=ip6tnl
    169	readonly fouproto="41 -6"
    170	readonly fouproto_mpls="${mplsproto} -6"
    171	readonly gretaptype=ip6gretap
    172	;;
    173*)
    174	echo "unknown arg: $1"
    175	exit 1
    176	;;
    177esac
    178
    179readonly tuntype=$2
    180readonly mac=$3
    181readonly datalen=$4
    182
    183echo "encap ${addr1} to ${addr2}, type ${tuntype}, mac ${mac} len ${datalen}"
    184
    185trap cleanup EXIT
    186
    187setup
    188
    189# basic communication works
    190echo "test basic connectivity"
    191server_listen
    192client_connect
    193verify_data
    194
    195# clientside, insert bpf program to encap all TCP to port ${port}
    196# client can no longer connect
    197ip netns exec "${ns1}" tc qdisc add dev veth1 clsact
    198ip netns exec "${ns1}" tc filter add dev veth1 egress \
    199	bpf direct-action object-file ./test_tc_tunnel.o \
    200	section "encap_${tuntype}_${mac}"
    201echo "test bpf encap without decap (expect failure)"
    202server_listen
    203! client_connect
    204
    205if [[ "$tuntype" =~ "udp" ]]; then
    206	# Set up fou tunnel.
    207	ttype="${foutype}"
    208	targs="encap fou encap-sport auto encap-dport $udpport"
    209	# fou may be a module; allow this to fail.
    210	modprobe "${foumod}" ||true
    211	if [[ "$mac" == "mpls" ]]; then
    212		dport=${mplsudpport}
    213		dproto=${fouproto_mpls}
    214		tmode="mode any ttl 255"
    215	else
    216		dport=${udpport}
    217		dproto=${fouproto}
    218	fi
    219	ip netns exec "${ns2}" ip fou add port $dport ipproto ${dproto}
    220	targs="encap fou encap-sport auto encap-dport $dport"
    221elif [[ "$tuntype" =~ "gre" && "$mac" == "eth" ]]; then
    222	ttype=$gretaptype
    223elif [[ "$tuntype" =~ "vxlan" && "$mac" == "eth" ]]; then
    224	ttype="vxlan"
    225	targs="id 1 dstport 8472 udp6zerocsumrx"
    226else
    227	ttype=$tuntype
    228	targs=""
    229fi
    230
    231# tunnel address family differs from inner for SIT
    232if [[ "${tuntype}" == "sit" ]]; then
    233	link_addr1="${ns1_v4}"
    234	link_addr2="${ns2_v4}"
    235else
    236	link_addr1="${addr1}"
    237	link_addr2="${addr2}"
    238fi
    239
    240# serverside, insert decap module
    241# server is still running
    242# client can connect again
    243ip netns exec "${ns2}" ip link add name testtun0 type "${ttype}" \
    244	${tmode} remote "${link_addr1}" local "${link_addr2}" $targs
    245
    246expect_tun_fail=0
    247
    248if [[ "$tuntype" == "ip6udp" && "$mac" == "mpls" ]]; then
    249	# No support for MPLS IPv6 fou tunnel; expect failure.
    250	expect_tun_fail=1
    251elif [[ "$tuntype" =~ "udp" && "$mac" == "eth" ]]; then
    252	# No support for TEB fou tunnel; expect failure.
    253	expect_tun_fail=1
    254elif [[ "$tuntype" =~ (gre|vxlan) && "$mac" == "eth" ]]; then
    255	# Share ethernet address between tunnel/veth2 so L2 decap works.
    256	ethaddr=$(ip netns exec "${ns2}" ip link show veth2 | \
    257		  awk '/ether/ { print $2 }')
    258	ip netns exec "${ns2}" ip link set testtun0 address $ethaddr
    259elif [[ "$mac" == "mpls" ]]; then
    260	modprobe mpls_iptunnel ||true
    261	modprobe mpls_gso ||true
    262	ip netns exec "${ns2}" sysctl -qw net.mpls.platform_labels=65536
    263	ip netns exec "${ns2}" ip -f mpls route add 1000 dev lo
    264	ip netns exec "${ns2}" ip link set lo up
    265	ip netns exec "${ns2}" sysctl -qw net.mpls.conf.testtun0.input=1
    266	ip netns exec "${ns2}" sysctl -qw net.ipv4.conf.lo.rp_filter=0
    267fi
    268
    269# Because packets are decapped by the tunnel they arrive on testtun0 from
    270# the IP stack perspective.  Ensure reverse path filtering is disabled
    271# otherwise we drop the TCP SYN as arriving on testtun0 instead of the
    272# expected veth2 (veth2 is where 192.168.1.2 is configured).
    273ip netns exec "${ns2}" sysctl -qw net.ipv4.conf.all.rp_filter=0
    274# rp needs to be disabled for both all and testtun0 as the rp value is
    275# selected as the max of the "all" and device-specific values.
    276ip netns exec "${ns2}" sysctl -qw net.ipv4.conf.testtun0.rp_filter=0
    277ip netns exec "${ns2}" ip link set dev testtun0 up
    278if [[ "$expect_tun_fail" == 1 ]]; then
    279	# This tunnel mode is not supported, so we expect failure.
    280	echo "test bpf encap with tunnel device decap (expect failure)"
    281	! client_connect
    282else
    283	echo "test bpf encap with tunnel device decap"
    284	client_connect
    285	verify_data
    286	server_listen
    287fi
    288
    289# bpf_skb_net_shrink does not take tunnel flags yet, cannot update L3.
    290if [[ "${tuntype}" == "sit" ]]; then
    291	echo OK
    292	exit 0
    293fi
    294
    295# serverside, use BPF for decap
    296ip netns exec "${ns2}" ip link del dev testtun0
    297ip netns exec "${ns2}" tc qdisc add dev veth2 clsact
    298ip netns exec "${ns2}" tc filter add dev veth2 ingress \
    299	bpf direct-action object-file ./test_tc_tunnel.o section decap
    300echo "test bpf encap with bpf decap"
    301client_connect
    302verify_data
    303
    304echo OK