samples/bpf/tc_l2_redirect.sh

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