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_FORWARDING=$(< /proc/sys/net/ipv6/conf/all/forwarding)
  12
  13 function 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
  69 function 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
  85 function 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
 121 function 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
 160 cleanup
 161 test_names="l2_to_ipip l2_to_ip6tnl"
 162 test_dirs="ingress egress"
 163 if [[ $# -ge 2 ]]; then
 164         test_names=$1
 165         test_dirs=$2
 166 elif [[ $# -ge 1 ]]; then
 167         test_names=$1
 168 fi
 169
 170 for t in $test_names; do
 171         for d in $test_dirs; do
 172                 $t $d
 173         done
 174 done