1#!/bin/bash 2# SPDX-License-Identifier: GPL-2.0 3 4[[ -z $TC ]] && TC='tc' 5[[ -z $IP ]] && IP='ip' 6 7REDIRECT_USER='./tc_l2_redirect' 8REDIRECT_BPF='./tc_l2_redirect_kern.o' 9 10RP_FILTER=$(< /proc/sys/net/ipv4/conf/all/rp_filter) 11IPV6_FORWARDING=$(< /proc/sys/net/ipv6/conf/all/forwarding) 12 13function config_common { 14 local tun_type=$1 15 16 $IP netns add ns1 17 $IP netns add ns2 18 $IP link add ve1 type veth peer name vens1 19 $IP link add ve2 type veth peer name vens2 20 $IP link set dev ve1 up 21 $IP link set dev ve2 up 22 $IP link set dev ve1 mtu 1500 23 $IP link set dev ve2 mtu 1500 24 $IP link set dev vens1 netns ns1 25 $IP link set dev vens2 netns ns2 26 27 $IP -n ns1 link set dev lo up 28 $IP -n ns1 link set dev vens1 up 29 $IP -n ns1 addr add 10.1.1.101/24 dev vens1 30 $IP -n ns1 addr add 2401:db01::65/64 dev vens1 nodad 31 $IP -n ns1 route add default via 10.1.1.1 dev vens1 32 $IP -n ns1 route add default via 2401:db01::1 dev vens1 33 34 $IP -n ns2 link set dev lo up 35 $IP -n ns2 link set dev vens2 up 36 $IP -n ns2 addr add 10.2.1.102/24 dev vens2 37 $IP -n ns2 addr add 2401:db02::66/64 dev vens2 nodad 38 $IP -n ns2 addr add 10.10.1.102 dev lo 39 $IP -n ns2 addr add 2401:face::66/64 dev lo nodad 40 $IP -n ns2 link add ipt2 type ipip local 10.2.1.102 remote 10.2.1.1 41 $IP -n ns2 link add ip6t2 type ip6tnl mode any local 2401:db02::66 remote 2401:db02::1 42 $IP -n ns2 link set dev ipt2 up 43 $IP -n ns2 link set dev ip6t2 up 44 $IP netns exec ns2 $TC qdisc add dev vens2 clsact 45 $IP netns exec ns2 $TC filter add dev vens2 ingress bpf da obj $REDIRECT_BPF sec drop_non_tun_vip 46 if [[ $tun_type == "ipip" ]]; then 47 $IP -n ns2 route add 10.1.1.0/24 dev ipt2 48 $IP netns exec ns2 sysctl -q -w net.ipv4.conf.all.rp_filter=0 49 $IP netns exec ns2 sysctl -q -w net.ipv4.conf.ipt2.rp_filter=0 50 else 51 $IP -n ns2 route add 10.1.1.0/24 dev ip6t2 52 $IP -n ns2 route add 2401:db01::/64 dev ip6t2 53 $IP netns exec ns2 sysctl -q -w net.ipv4.conf.all.rp_filter=0 54 $IP netns exec ns2 sysctl -q -w net.ipv4.conf.ip6t2.rp_filter=0 55 fi 56 57 $IP addr add 10.1.1.1/24 dev ve1 58 $IP addr add 2401:db01::1/64 dev ve1 nodad 59 $IP addr add 10.2.1.1/24 dev ve2 60 $IP addr add 2401:db02::1/64 dev ve2 nodad 61 62 $TC qdisc add dev ve2 clsact 63 $TC filter add dev ve2 ingress bpf da obj $REDIRECT_BPF sec l2_to_iptun_ingress_forward 64 65 sysctl -q -w net.ipv4.conf.all.rp_filter=0 66 sysctl -q -w net.ipv6.conf.all.forwarding=1 67} 68 69function cleanup { 70 set +e 71 [[ -z $DEBUG ]] || set +x 72 $IP netns delete ns1 >& /dev/null 73 $IP netns delete ns2 >& /dev/null 74 $IP link del ve1 >& /dev/null 75 $IP link del ve2 >& /dev/null 76 $IP link del ipt >& /dev/null 77 $IP link del ip6t >& /dev/null 78 sysctl -q -w net.ipv4.conf.all.rp_filter=$RP_FILTER 79 sysctl -q -w net.ipv6.conf.all.forwarding=$IPV6_FORWARDING 80 rm -f /sys/fs/bpf/tc/globals/tun_iface 81 [[ -z $DEBUG ]] || set -x 82 set -e 83} 84 85function l2_to_ipip { 86 echo -n "l2_to_ipip $1: " 87 88 local dir=$1 89 90 config_common ipip 91 92 $IP link add ipt type ipip external 93 $IP link set dev ipt up 94 sysctl -q -w net.ipv4.conf.ipt.rp_filter=0 95 sysctl -q -w net.ipv4.conf.ipt.forwarding=1 96 97 if [[ $dir == "egress" ]]; then 98 $IP route add 10.10.1.0/24 via 10.2.1.102 dev ve2 99 $TC filter add dev ve2 egress bpf da obj $REDIRECT_BPF sec l2_to_iptun_ingress_redirect 100 sysctl -q -w net.ipv4.conf.ve1.forwarding=1 101 else 102 $TC qdisc add dev ve1 clsact 103 $TC filter add dev ve1 ingress bpf da obj $REDIRECT_BPF sec l2_to_iptun_ingress_redirect 104 fi 105 106 $REDIRECT_USER -U /sys/fs/bpf/tc/globals/tun_iface -i $(< /sys/class/net/ipt/ifindex) 107 108 $IP netns exec ns1 ping -c1 10.10.1.102 >& /dev/null 109 110 if [[ $dir == "egress" ]]; then 111 # test direct egress to ve2 (i.e. not forwarding from 112 # ve1 to ve2). 113 ping -c1 10.10.1.102 >& /dev/null 114 fi 115 116 cleanup 117 118 echo "OK" 119} 120 121function l2_to_ip6tnl { 122 echo -n "l2_to_ip6tnl $1: " 123 124 local dir=$1 125 126 config_common ip6tnl 127 128 $IP link add ip6t type ip6tnl mode any external 129 $IP link set dev ip6t up 130 sysctl -q -w net.ipv4.conf.ip6t.rp_filter=0 131 sysctl -q -w net.ipv4.conf.ip6t.forwarding=1 132 133 if [[ $dir == "egress" ]]; then 134 $IP route add 10.10.1.0/24 via 10.2.1.102 dev ve2 135 $IP route add 2401:face::/64 via 2401:db02::66 dev ve2 136 $TC filter add dev ve2 egress bpf da obj $REDIRECT_BPF sec l2_to_ip6tun_ingress_redirect 137 sysctl -q -w net.ipv4.conf.ve1.forwarding=1 138 else 139 $TC qdisc add dev ve1 clsact 140 $TC filter add dev ve1 ingress bpf da obj $REDIRECT_BPF sec l2_to_ip6tun_ingress_redirect 141 fi 142 143 $REDIRECT_USER -U /sys/fs/bpf/tc/globals/tun_iface -i $(< /sys/class/net/ip6t/ifindex) 144 145 $IP netns exec ns1 ping -c1 10.10.1.102 >& /dev/null 146 $IP netns exec ns1 ping -6 -c1 2401:face::66 >& /dev/null 147 148 if [[ $dir == "egress" ]]; then 149 # test direct egress to ve2 (i.e. not forwarding from 150 # ve1 to ve2). 151 ping -c1 10.10.1.102 >& /dev/null 152 ping -6 -c1 2401:face::66 >& /dev/null 153 fi 154 155 cleanup 156 157 echo "OK" 158} 159 160cleanup 161test_names="l2_to_ipip l2_to_ip6tnl" 162test_dirs="ingress egress" 163if [[ $# -ge 2 ]]; then 164 test_names=$1 165 test_dirs=$2 166elif [[ $# -ge 1 ]]; then 167 test_names=$1 168fi 169 170for t in $test_names; do 171 for d in $test_dirs; do 172 $t $d 173 done 174done 175