samples/bpf/tc_l2_redirect.sh

   1 #!/bin/bash
   2 # SPDX-License-Identifier: GPL-2.0
   3
   4 [[ -z $TC ]] && TC='tc'
   5 [[ -z $IP ]] && IP='ip'
   6
   7 REDIRECT_USER='./tc_l2_redirect'
   8 REDIRECT_BPF='./tc_l2_redirect_kern.o'
   9
  10 RP_FILTER=$(< /proc/sys/net/ipv4/conf/all/rp_filter)
  11 IPV6_DISABLED=$(< /proc/sys/net/ipv6/conf/all/disable_ipv6)
  12 IPV6_FORWARDING=$(< /proc/sys/net/ipv6/conf/all/forwarding)
  13
  14 function config_common {
  15         local tun_type=$1
  16
  17         $IP netns add ns1
  18         $IP netns add ns2
  19         $IP link add ve1 type veth peer name vens1
  20         $IP link add ve2 type veth peer name vens2
  21         $IP link set dev ve1 up
  22         $IP link set dev ve2 up
  23         $IP link set dev ve1 mtu 1500
  24         $IP link set dev ve2 mtu 1500
  25         $IP link set dev vens1 netns ns1
  26         $IP link set dev vens2 netns ns2
  27
  28         $IP -n ns1 link set dev lo up
  29         $IP -n ns1 link set dev vens1 up
  30         $IP -n ns1 addr add 10.1.1.101/24 dev vens1
  31         $IP -n ns1 addr add 2401:db01::65/64 dev vens1 nodad
  32         $IP -n ns1 route add default via 10.1.1.1 dev vens1
  33         $IP -n ns1 route add default via 2401:db01::1 dev vens1
  34
  35         $IP -n ns2 link set dev lo up
  36         $IP -n ns2 link set dev vens2 up
  37         $IP -n ns2 addr add 10.2.1.102/24 dev vens2
  38         $IP -n ns2 addr add 2401:db02::66/64 dev vens2 nodad
  39         $IP -n ns2 addr add 10.10.1.102 dev lo
  40         $IP -n ns2 addr add 2401:face::66/64 dev lo nodad
  41         $IP -n ns2 link add ipt2 type ipip local 10.2.1.102 remote 10.2.1.1
  42         $IP -n ns2 link add ip6t2 type ip6tnl mode any local 2401:db02::66 remote 2401:db02::1
  43         $IP -n ns2 link set dev ipt2 up
  44         $IP -n ns2 link set dev ip6t2 up
  45         $IP netns exec ns2 $TC qdisc add dev vens2 clsact
  46         $IP netns exec ns2 $TC filter add dev vens2 ingress bpf da obj $REDIRECT_BPF sec drop_non_tun_vip
  47         if [[ $tun_type == "ipip" ]]; then
  48                 $IP -n ns2 route add 10.1.1.0/24 dev ipt2
  49                 $IP netns exec ns2 sysctl -q -w net.ipv4.conf.all.rp_filter=0
  50                 $IP netns exec ns2 sysctl -q -w net.ipv4.conf.ipt2.rp_filter=0
  51         else
  52                 $IP -n ns2 route add 10.1.1.0/24 dev ip6t2
  53                 $IP -n ns2 route add 2401:db01::/64 dev ip6t2
  54                 $IP netns exec ns2 sysctl -q -w net.ipv4.conf.all.rp_filter=0
  55                 $IP netns exec ns2 sysctl -q -w net.ipv4.conf.ip6t2.rp_filter=0
  56         fi
  57
  58         $IP addr add 10.1.1.1/24 dev ve1
  59         $IP addr add 2401:db01::1/64 dev ve1 nodad
  60         $IP addr add 10.2.1.1/24 dev ve2
  61         $IP addr add 2401:db02::1/64 dev ve2 nodad
  62
  63         $TC qdisc add dev ve2 clsact
  64         $TC filter add dev ve2 ingress bpf da obj $REDIRECT_BPF sec l2_to_iptun_ingress_forward
  65
  66         sysctl -q -w net.ipv4.conf.all.rp_filter=0
  67         sysctl -q -w net.ipv6.conf.all.forwarding=1
  68         sysctl -q -w net.ipv6.conf.all.disable_ipv6=0
  69 }
  70
  71 function cleanup {
  72         set +e
  73         [[ -z $DEBUG ]] || set +x
  74         $IP netns delete ns1 >& /dev/null
  75         $IP netns delete ns2 >& /dev/null
  76         $IP link del ve1 >& /dev/null
  77         $IP link del ve2 >& /dev/null
  78         $IP link del ipt >& /dev/null
  79         $IP link del ip6t >& /dev/null
  80         sysctl -q -w net.ipv4.conf.all.rp_filter=$RP_FILTER
  81         sysctl -q -w net.ipv6.conf.all.forwarding=$IPV6_FORWARDING
  82         sysctl -q -w net.ipv6.conf.all.disable_ipv6=$IPV6_DISABLED
  83         rm -f /sys/fs/bpf/tc/globals/tun_iface
  84         [[ -z $DEBUG ]] || set -x
  85         set -e
  86 }
  87
  88 function l2_to_ipip {
  89         echo -n "l2_to_ipip $1: "
  90
  91         local dir=$1
  92
  93         config_common ipip
  94
  95         $IP link add ipt type ipip external
  96         $IP link set dev ipt up
  97         sysctl -q -w net.ipv4.conf.ipt.rp_filter=0
  98         sysctl -q -w net.ipv4.conf.ipt.forwarding=1
  99
 100         if [[ $dir == "egress" ]]; then
 101                 $IP route add 10.10.1.0/24 via 10.2.1.102 dev ve2
 102                 $TC filter add dev ve2 egress bpf da obj $REDIRECT_BPF sec l2_to_iptun_ingress_redirect
 103                 sysctl -q -w net.ipv4.conf.ve1.forwarding=1
 104         else
 105                 $TC qdisc add dev ve1 clsact
 106                 $TC filter add dev ve1 ingress bpf da obj $REDIRECT_BPF sec l2_to_iptun_ingress_redirect
 107         fi
 108
 109         $REDIRECT_USER -U /sys/fs/bpf/tc/globals/tun_iface -i $(< /sys/class/net/ipt/ifindex)
 110
 111         $IP netns exec ns1 ping -c1 10.10.1.102 >& /dev/null
 112
 113         if [[ $dir == "egress" ]]; then
 114                 # test direct egress to ve2 (i.e. not forwarding from
 115                 # ve1 to ve2).
 116                 ping -c1 10.10.1.102 >& /dev/null
 117         fi
 118
 119         cleanup
 120
 121         echo "OK"
 122 }
 123
 124 function l2_to_ip6tnl {
 125         echo -n "l2_to_ip6tnl $1: "
 126
 127         local dir=$1
 128
 129         config_common ip6tnl
 130
 131         $IP link add ip6t type ip6tnl mode any external
 132         $IP link set dev ip6t up
 133         sysctl -q -w net.ipv4.conf.ip6t.rp_filter=0
 134         sysctl -q -w net.ipv4.conf.ip6t.forwarding=1
 135
 136         if [[ $dir == "egress" ]]; then
 137                 $IP route add 10.10.1.0/24 via 10.2.1.102 dev ve2
 138                 $IP route add 2401:face::/64 via 2401:db02::66 dev ve2
 139                 $TC filter add dev ve2 egress bpf da obj $REDIRECT_BPF sec l2_to_ip6tun_ingress_redirect
 140                 sysctl -q -w net.ipv4.conf.ve1.forwarding=1
 141         else
 142                 $TC qdisc add dev ve1 clsact
 143                 $TC filter add dev ve1 ingress bpf da obj $REDIRECT_BPF sec l2_to_ip6tun_ingress_redirect
 144         fi
 145
 146         $REDIRECT_USER -U /sys/fs/bpf/tc/globals/tun_iface -i $(< /sys/class/net/ip6t/ifindex)
 147
 148         $IP netns exec ns1 ping -c1 10.10.1.102 >& /dev/null
 149         $IP netns exec ns1 ping -6 -c1 2401:face::66 >& /dev/null
 150
 151         if [[ $dir == "egress" ]]; then
 152                 # test direct egress to ve2 (i.e. not forwarding from
 153                 # ve1 to ve2).
 154                 ping -c1 10.10.1.102 >& /dev/null
 155                 ping -6 -c1 2401:face::66 >& /dev/null
 156         fi
 157
 158         cleanup
 159
 160         echo "OK"
 161 }
 162
 163 cleanup
 164 test_names="l2_to_ipip l2_to_ip6tnl"
 165 test_dirs="ingress egress"
 166 if [[ $# -ge 2 ]]; then
 167         test_names=$1
 168         test_dirs=$2
 169 elif [[ $# -ge 1 ]]; then
 170         test_names=$1
 171 fi
 172
 173 for t in $test_names; do
 174         for d in $test_dirs; do
 175                 $t $d
 176         done
 177 done