From 54e2baec09d25e09389cbf29ff086c48e143bbb6 Mon Sep 17 00:00:00 2001 From: Ilya Maximets Date: Wed, 23 Oct 2019 22:26:52 +0200 Subject: flow: Fix crash on vlan packets with partial offloading. parse_tcp_flags() does not care about vlan tags in a packet thus not able to parse them. As a result, if partial offloading is enabled in userspace datapath vlan packets are not parsed, i.e. has no initialized offsets. This causes OVS crash on any attempt to access/modify packet header fields. For example, having the flow with following actions: in_port=1,ip,actions=mod_nw_src:192.168.0.7,output:IN_PORT will lead to OVS crash on vlan packet handling: Process terminating with default action of signal 11 (SIGSEGV) Invalid read of size 4 at 0x785657: get_16aligned_be32 (unaligned.h:249) by 0x785657: odp_set_ipv4 (odp-execute.c:82) by 0x785657: odp_execute_masked_set_action (odp-execute.c:527) by 0x785657: odp_execute_actions (odp-execute.c:894) by 0x74CDA9: dp_netdev_execute_actions (dpif-netdev.c:7355) by 0x74CDA9: packet_batch_per_flow_execute (dpif-netdev.c:6339) by 0x74CDA9: dp_netdev_input__ (dpif-netdev.c:6845) by 0x74DB6E: dp_netdev_input (dpif-netdev.c:6854) by 0x74DB6E: dp_netdev_process_rxq_port (dpif-netdev.c:4287) by 0x74E863: dpif_netdev_run (dpif-netdev.c:5264) by 0x703F57: type_run (ofproto-dpif.c:370) by 0x6EC8B8: ofproto_type_run (ofproto.c:1760) by 0x6DA52B: bridge_run__ (bridge.c:3188) by 0x6E083F: bridge_run (bridge.c:3252) by 0x1642E4: main (ovs-vswitchd.c:127) Address 0xc is not stack'd, malloc'd or (recently) free'd Fix that by properly parsing vlan tags first. Function 'parse_dl_type' transformed for that purpose as it had no users anyway. Added unit test for packet modification with partial offloading that triggers above crash. Fixes: aab96ec4d81e ("dpif-netdev: retrieve flow directly from the flow mark") Signed-off-by: Ilya Maximets Acked-by: Ben Pfaff --- tests/dpif-netdev.at | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) (limited to 'tests/dpif-netdev.at') diff --git a/tests/dpif-netdev.at b/tests/dpif-netdev.at index af8a29e44..ef521ddb8 100644 --- a/tests/dpif-netdev.at +++ b/tests/dpif-netdev.at @@ -420,3 +420,81 @@ p1: flow del: mark: 0 DPIF_NETDEV_FLOW_HW_OFFLOAD([dummy]) DPIF_NETDEV_FLOW_HW_OFFLOAD([dummy-pmd]) + + +m4_define([DPIF_NETDEV_FLOW_HW_OFFLOAD_OFFSETS], + [AT_SETUP([dpif-netdev - partial hw offload with packet modifications - $1]) + OVS_VSWITCHD_START( + [add-port br0 p1 -- \ + set interface p1 type=$1 ofport_request=1 options:pcap=p1.pcap options:ifindex=1 -- \ + set bridge br0 datapath-type=dummy \ + other-config:datapath-id=1234 fail-mode=secure], [], [], + [m4_if([$1], [dummy-pmd], [--dummy-numa="0,0,0,0,1,1,1,1"], [])]) + AT_CHECK([ovs-appctl vlog/set dpif:file:dbg dpif_netdev:file:dbg netdev_dummy:file:dbg]) + + AT_CHECK([ovs-vsctl set Open_vSwitch . other_config:hw-offload=true]) + OVS_WAIT_UNTIL([grep "netdev: Flow API Enabled" ovs-vswitchd.log]) + + AT_CHECK([ovs-ofctl del-flows br0]) + + # Setting flow to modify ipv4 src address and udp dst port to be sure that + # offloaded packets has correctly initialized l3/l4 offsets. + AT_CHECK([ovs-ofctl add-flow br0 in_port=1,udp,actions=mod_nw_src:192.168.0.7,mod_tp_dst:3773,output:IN_PORT]) + + packet="packet_type(ns=0,id=0),eth(src=00:06:07:08:09:0a,dst=00:01:02:03:04:05),eth_type(0x8100),vlan(vid=99,pcp=7),encap(eth_type(0x0800),ipv4(src=127.0.0.1,dst=127.0.0.1,proto=17,ttl=64,frag=no),udp(src=81,dst=82))" + AT_CHECK([ovs-appctl netdev-dummy/receive p1 $packet --len 64], [0]) + + OVS_WAIT_UNTIL([grep "miss upcall" ovs-vswitchd.log]) + AT_CHECK([grep -A 1 'miss upcall' ovs-vswitchd.log | tail -n 1], [0], [dnl +skb_priority(0),skb_mark(0),ct_state(0),ct_zone(0),ct_mark(0),ct_label(0),recirc_id(0),dp_hash(0),in_port(1),dnl +packet_type(ns=0,id=0),eth(src=00:06:07:08:09:0a,dst=00:01:02:03:04:05),eth_type(0x8100),vlan(vid=99,pcp=7),encap(eth_type(0x0800),ipv4(src=127.0.0.1,dst=127.0.0.1,proto=17,tos=0,ttl=64,frag=no),udp(src=81,dst=82)) +]) + # Check that flow successfully offloaded. + OVS_WAIT_UNTIL([grep "succeed to add netdev flow" ovs-vswitchd.log]) + AT_CHECK([filter_hw_flow_install < ovs-vswitchd.log | strip_xout], [0], [dnl +p1: flow put[[create]]: flow match: recirc_id=0,eth,udp,in_port=1,dl_vlan=99,dl_vlan_pcp=7,nw_src=127.0.0.1,nw_frag=no,tp_dst=82, mark: 0 +]) + # Check that datapath flow installed successfully. + AT_CHECK([filter_flow_install < ovs-vswitchd.log | strip_xout], [0], [dnl +recirc_id(0),in_port(1),packet_type(ns=0,id=0),eth_type(0x8100),vlan(vid=99,pcp=7),encap(eth_type(0x0800),ipv4(src=127.0.0.1,proto=17,frag=no),udp(dst=82)), actions: +]) + # Inject the same packet again. + AT_CHECK([ovs-appctl netdev-dummy/receive p1 $packet --len 64], [0]) + + # Check for succesfull packet matching with installed offloaded flow. + AT_CHECK([filter_hw_packet_netdev_dummy < ovs-vswitchd.log | strip_xout], [0], [dnl +p1: packet: udp,dl_vlan=99,dl_vlan_pcp=7,vlan_tci1=0x0000,dl_src=00:06:07:08:09:0a,dl_dst=00:01:02:03:04:05,nw_src=127.0.0.1,nw_dst=127.0.0.1,nw_tos=0,nw_ecn=0,nw_ttl=64,tp_src=81,tp_dst=82 dnl +matches with flow: recirc_id=0,eth,udp,dl_vlan=99,dl_vlan_pcp=7,nw_src=127.0.0.1,nw_frag=no,tp_dst=82 with mark: 0 +]) + + ovs-appctl revalidator/wait + # Dump the datapath flow to see that actions was executed for a packet. + AT_CHECK([ovs-appctl dpif/dump-flows br0 | strip_timers], [0], [dnl +recirc_id(0),in_port(1),packet_type(ns=0,id=0),eth_type(0x8100),vlan(vid=99,pcp=7),encap(eth_type(0x0800),ipv4(src=127.0.0.1,proto=17,frag=no),udp(dst=82)), dnl +packets:1, bytes:64, used:0.0s, actions:set(ipv4(src=192.168.0.7)),set(udp(dst=3773)),1 +]) + + # Wait for datapath flow expiration. + ovs-appctl time/stop + ovs-appctl time/warp 15000 + ovs-appctl revalidator/wait + + # Check that flow successfully deleted from HW. + OVS_WAIT_UNTIL([grep "succeed to delete netdev flow" ovs-vswitchd.log]) + AT_CHECK([filter_hw_flow_del < ovs-vswitchd.log | strip_xout], [0], [dnl +p1: flow del: mark: 0 +]) + + # Check that ip address and udp port were correctly modified in output packets. + AT_CHECK([ovs-ofctl parse-pcap p1.pcap], [0], [dnl +udp,in_port=ANY,dl_vlan=99,dl_vlan_pcp=7,vlan_tci1=0x0000,dl_src=00:06:07:08:09:0a,dl_dst=00:01:02:03:04:05,nw_src=127.0.0.1,nw_dst=127.0.0.1,nw_tos=0,nw_ecn=0,nw_ttl=64,tp_src=81,tp_dst=82 +udp,in_port=ANY,dl_vlan=99,dl_vlan_pcp=7,vlan_tci1=0x0000,dl_src=00:06:07:08:09:0a,dl_dst=00:01:02:03:04:05,nw_src=192.168.0.7,nw_dst=127.0.0.1,nw_tos=0,nw_ecn=0,nw_ttl=64,tp_src=81,tp_dst=3773 +udp,in_port=ANY,dl_vlan=99,dl_vlan_pcp=7,vlan_tci1=0x0000,dl_src=00:06:07:08:09:0a,dl_dst=00:01:02:03:04:05,nw_src=127.0.0.1,nw_dst=127.0.0.1,nw_tos=0,nw_ecn=0,nw_ttl=64,tp_src=81,tp_dst=82 +udp,in_port=ANY,dl_vlan=99,dl_vlan_pcp=7,vlan_tci1=0x0000,dl_src=00:06:07:08:09:0a,dl_dst=00:01:02:03:04:05,nw_src=192.168.0.7,nw_dst=127.0.0.1,nw_tos=0,nw_ecn=0,nw_ttl=64,tp_src=81,tp_dst=3773 +]) + + OVS_VSWITCHD_STOP + AT_CLEANUP]) + +DPIF_NETDEV_FLOW_HW_OFFLOAD_OFFSETS([dummy]) +DPIF_NETDEV_FLOW_HW_OFFLOAD_OFFSETS([dummy-pmd]) -- cgit v1.2.1