Add test_trunc exercising the OVS_ACTION_ATTR_TRUNC action. The test verifies truncation in three steps: first confirm normal forwarding works, then apply trunc(14) which truncates packets to the Ethernet header and verify ping fails, then restore normal forwarding and verify connectivity recovers.
The trunc action sets OVS_CB(skb)->cutlen, causing pskb_trim at output time. With trunc(14) the IP payload is stripped, so the receiver drops the frame and ICMP echo reply is never generated. Signed-off-by: Minxi Hou <[email protected]> --- .../selftests/net/openvswitch/openvswitch.sh | 66 +++++++++++++++++++ 1 file changed, 66 insertions(+) diff --git a/tools/testing/selftests/net/openvswitch/openvswitch.sh b/tools/testing/selftests/net/openvswitch/openvswitch.sh index 82f066a0ceed..181eeb332de9 100755 --- a/tools/testing/selftests/net/openvswitch/openvswitch.sh +++ b/tools/testing/selftests/net/openvswitch/openvswitch.sh @@ -30,6 +30,7 @@ tests=" drop_reason drop: test drop reasons are emitted pop_vlan vlan: POP_VLAN action strips tag dec_ttl ttl: dec_ttl decrements IP TTL + trunc trunc: output truncation psample psample: Sampling packets with psample" info() { @@ -300,6 +301,71 @@ test_dec_ttl() { return 0 } +test_trunc() { + sbx_add "test_trunc" || return $? + ovs_add_dp "test_trunc" trunctest || return 1 + + info "create namespaces" + for ns in client server; do + ovs_add_netns_and_veths "test_trunc" "trunctest" "$ns" \ + "${ns:0:1}0" "${ns:0:1}1" || return 1 + done + + ip netns exec client ip addr add 10.0.0.1/24 dev c1 + ip netns exec client ip link set c1 up + ip netns exec server ip addr add 10.0.0.2/24 dev s1 + ip netns exec server ip link set s1 up + + ovs_add_flow "test_trunc" trunctest \ + 'in_port(1),eth(),eth_type(0x0806),arp()' '2' || return 1 + ovs_add_flow "test_trunc" trunctest \ + 'in_port(2),eth(),eth_type(0x0806),arp()' '1' || return 1 + + ovs_add_flow "test_trunc" trunctest \ + 'in_port(1),eth(),eth_type(0x0800),ipv4()' '2' || return 1 + ovs_add_flow "test_trunc" trunctest \ + 'in_port(2),eth(),eth_type(0x0800),ipv4()' '1' || return 1 + + info "verify connectivity without truncation" + ovs_sbx "test_trunc" ip netns exec client ping -c 1 -W 2 \ + 10.0.0.2 || return 1 + + ovs_del_flows "test_trunc" trunctest + ovs_add_flow "test_trunc" trunctest \ + 'in_port(1),eth(),eth_type(0x0806),arp()' '2' || return 1 + ovs_add_flow "test_trunc" trunctest \ + 'in_port(2),eth(),eth_type(0x0806),arp()' '1' || return 1 + + info "add truncated forwarding flow" + ovs_add_flow "test_trunc" trunctest \ + 'in_port(1),eth(),eth_type(0x0800),ipv4()' \ + 'trunc(14),2' || return 1 + ovs_add_flow "test_trunc" trunctest \ + 'in_port(2),eth(),eth_type(0x0800),ipv4()' '1' || return 1 + + info "verify ping fails with truncation" + ovs_sbx "test_trunc" ip netns exec client ping -c 1 -W 2 \ + 10.0.0.2 >/dev/null 2>&1 \ + && { info "FAIL: ping should fail with trunc(14)" + return 1; } + + ovs_del_flows "test_trunc" trunctest + ovs_add_flow "test_trunc" trunctest \ + 'in_port(1),eth(),eth_type(0x0806),arp()' '2' || return 1 + ovs_add_flow "test_trunc" trunctest \ + 'in_port(2),eth(),eth_type(0x0806),arp()' '1' || return 1 + ovs_add_flow "test_trunc" trunctest \ + 'in_port(1),eth(),eth_type(0x0800),ipv4()' '2' || return 1 + ovs_add_flow "test_trunc" trunctest \ + 'in_port(2),eth(),eth_type(0x0800),ipv4()' '1' || return 1 + + info "verify connectivity restored without truncation" + ovs_sbx "test_trunc" ip netns exec client ping -c 1 -W 2 \ + 10.0.0.2 || return 1 + + return 0 +} + # psample test # - use psample to observe packets test_psample() { -- 2.54.0 _______________________________________________ dev mailing list [email protected] https://mail.openvswitch.org/mailman/listinfo/ovs-dev
