Did not see a response so sending again, am I missing something here, or is it a bug?

Thanks
Brendan

On 28/07/2022 19:53, Brendan Doyle wrote:
UDP stateful ACL not working? The logical representation of My network  is shown bellow ('ovn-nbctl show' shown towards the end). I have a Port Group (pg_vcn3_net1_sl3) that has two ports in it, the VM port on switch(ls_vcn3_net1) and lsb_vcn4_stgw-lr_vcn3_stgw switch
(ls_vcn3_backbone) asshown below ((o)).

I do a 'showmount -e 192.16.1.106' in the VM, I see the pkt go out from the VM  get to the NFS server on the underlay, see the reply on the underlay and then I see my PG ACL drop the pkt.

The ACLs are:

Egress From VM - Ingress to switch
-----------------------------------
from-lport 32767 (inport == @pg_vcn3_net1_sl3 && (arp || udp.dst == 67 || udp.dst == 68)) allow-related from-lport 27000 (inport == @pg_vcn3_net1_sl3 && ip4.dst == 192.16.1.0/24 && udp.dst == 111) allow-related from-lport     0 (inport == @pg_vcn3_net1_sl3) drop log(name=fss-8,severity=debug) <------- Drops the return pkt

Ingress TO VM - Egress from switch
------------------------------------
  to-lport 32767 (outport == @pg_vcn3_net1_sl3 && (arp || udp.dst == 67 || udp.dst == 68)) allow-related   to-lport 27000 (outport == @pg_vcn3_net1_sl3 && ip4.src == 192.16.1.0/24 && tcp.dst == 111) allow-related   to-lport 27000 (outport == @pg_vcn3_net1_sl3 && ip4.src == 192.16.1.0/24 && tcp.dst == 20048) allow-related *  to-lport 27000 (outport == @pg_vcn3_net1_sl3 && ip4.src == 192.16.1.0/24 && udp.dst == 111) allow-related  <------- But this should *   to-lport     0 (outport == @pg_vcn3_net1_sl3) drop log(name=fss-17,severity=debug)                            have allowed the
                                 return pkt


        +----------------+
        |       VM       |
        | 192.16.1.6     |
        +-----((O))------+
                | *284195d2-9280-4334-900e-571ecd00327a *in PG*pg_vcn3_net1_sl3*
      +---------------------+
      |    ls_vcn3_net1     |
      +---------------------+
                | ls_vcn3_net1-lr_vcn3_net1 (proxy ARP for 192.16.1.106)
                  |
                |
                | lr_vcn3_net1-ls_vcn3_net1 (192.16.1.1/24)
          /------------\
         ( lr_vcn3_net1 )
          \------------/
                | lr_vcn3_net1-lsb_vcn3_net1 (253.255.25.1/25)
                |
                |
                | lsb_vcn3_net1-lr_vcn3_net1
     +------------------------+
     |   ls_vcn3_backbone     |
     +--------((O))-----------+
                | *lsb_vcn4_stgw-lr_vcn3_stgw *in PG*pg_vcn3_net1_sl3*
                |
                |
                | lr_vcn3_stgw-lsb_vcn3_stgw (253.255.25.10/25)
         /------------\
        ( lr_vcn3_stgw ) SNAT 192.16.1.6 to 253.255.80.8
         \------------/
                | lr_vcn3_stgw-ls_vcn3_external_stgw (253.255.80.20/16)
                |
                |
                | ls_vcn3_external_stgw-lr_vcn3_stgw
      +-----------------------+
      | ls_vcn3_external_stgw |
      +-----------------------+
                | ln-ls_vcn3_external_stgw
                |   (localnet)
                |
           +---------+
           | br-ext  | Physical OVS on chassis
           +---------+
                |      Egress : Change dst 192.16.1.106 to dst 253.255.0.2
                |      Ingress: Change src 253.255.0.2 to 192.16.1.106
253.255.0.0/16  |
                |
         +---------------+
         |  NFS server   |
         | 253.255.0.2   |
         +---------------+

When I do a trace of the out going pkt, it looks like to me that there is no conntrack established in the ls_vcn3_backbone so it does not recognize the return pkt as a return
but the 'allow-related' should have established that. See Below


ovn-trace --detailed ls_vcn3_net1 'inport == "284195d2-9280-4334-900e-571ecd00327a" && eth.dst == 40:44:00:00:00:90 && eth.src == 52:54:00:02:55:96 && ip4.src == 192.16.1.6 && ip4.dst == 192.16.1.106 && ip.ttl == 64 && udp.dst == 111' # udp,reg14=0x1,vlan_tci=0x0000,dl_src=52:54:00:02:55:96,dl_dst=40:44:00:00:00:90,nw_src=192.16.1.6,nw_dst=192.16.1.106,nw_tos=0,nw_ecn=0,nw_ttl=64,tp_src=0,tp_dst=111

ingress(dp="ls_vcn3_net1", inport="284195")
-------------------------------------------
 0. ls_in_port_sec_l2 (northd.c:5493): inport == "284195", priority 50, uuid 0b9563aa
    next;
 5. ls_in_pre_acl (northd.c:5753): ip, priority 100, uuid fad1d4d2
    reg0[0] = 1;
    next;
 7. ls_in_pre_stateful (northd.c:5937): reg0[0] == 1, priority 100, uuid 0bb84a55
    ct_next;

ct_next(ct_state=est|trk /* default (use --ct to customize) */) *<----- Looks like we set up conntrack on the ls_vcn3_net1*
---------------------------------------------------------------
 8. ls_in_acl_hint (northd.c:6019): !ct.new && ct.est && !ct.rpl && ct_label.blocked == 0, priority 4, uuid 2712c6a2
    reg0[8] = 1;
    reg0[10] = 1;
    next;
 9. ls_in_acl (northd.c:6244): reg0[8] == 1 && (inport == @pg_vcn3_net1_sl3 && ip4.dst == 192.16.1.0/24 && udp.dst == 111), priority 28000, uuid aff2df9c
    next;
22. ls_in_l2_lkup (northd.c:8218): eth.dst == 40:44:00:00:00:90, priority 50, uuid 9b0ee70d
    outport = "ls_vcn3_net1-lr_vcn3_net1";
    output;

egress(dp="ls_vcn3_net1", inport="284195", outport="ls_vcn3_net1-lr_vcn3_net1")
-------------------------------------------------------------------------------
 0. ls_out_pre_lb (northd.c:5643): ip && outport == "ls_vcn3_net1-lr_vcn3_net1", priority 110, uuid d8ef0aac
    next;
 1. ls_out_pre_acl (northd.c:5643): ip && outport == "ls_vcn3_net1-lr_vcn3_net1", priority 110, uuid d5cd7965
    next;
 3. ls_out_acl_hint (northd.c:6019): !ct.new && ct.est && !ct.rpl && ct_label.blocked == 0, priority 4, uuid 930df986
    reg0[8] = 1;
    reg0[10] = 1;
    next;
 9. ls_out_port_sec_l2 (northd.c:5591): outport == "ls_vcn3_net1-lr_vcn3_net1", priority 50, uuid 56148a7c
    output;
    /* output to "ls_vcn3_net1-lr_vcn3_net1", type "patch" */

ingress(dp="lr_vcn3_net1", inport="lr_vcn3_net1-ls_vcn3_net1")
--------------------------------------------------------------
 0. lr_in_admission (northd.c:10519): eth.dst == 40:44:00:00:00:90 && inport == "lr_vcn3_net1-ls_vcn3_net1", priority 50, uuid 08eee924
    xreg0[0..47] = 40:44:00:00:00:90;
    next;
 1. lr_in_lookup_neighbor (northd.c:10662): 1, priority 0, uuid d3159b2b
    reg9[2] = 1;
    next;
 2. lr_in_learn_neighbor (northd.c:10671): reg9[2] == 1, priority 100, uuid bef4eddc
    next;
10. lr_in_ip_routing_pre (northd.c:10905): 1, priority 0, uuid c7269d9a
    reg7 = 0;
    next;
11. lr_in_ip_routing (northd.c:9435): ip4.dst == 192.16.1.0/24, priority 74, uuid a571523c
    ip.ttl--;
    reg8[0..15] = 0;
    reg0 = ip4.dst;
    reg1 = 192.16.1.1;
    eth.src = 40:44:00:00:00:90;
    outport = "lr_vcn3_net1-ls_vcn3_net1";
    flags.loopback = 1;
    next;
12. lr_in_ip_routing_ecmp (northd.c:10980): reg8[0..15] == 0, priority 150, uuid 5aa40905
    next;
13. lr_in_policy (northd.c:8667): ip4.dst == 192.16.1.106, priority 100, uuid fe728a63
    reg0 = 253.255.25.10;
    reg1 = 253.255.25.1;
    eth.src = 40:44:00:00:00:a0;
    outport = "lr_vcn3_net1-lsb_vcn3_net1";
    flags.loopback = 1;
    reg8[0..15] = 0;
    next;
14. lr_in_policy_ecmp (northd.c:11115): reg8[0..15] == 0, priority 150, uuid 3f7c2e78
    next;
15. lr_in_arp_resolve (northd.c:11503): outport == "lr_vcn3_net1-lsb_vcn3_net1" && reg0 == 253.255.25.10, priority 100, uuid 8274aa30
    eth.dst = 40:44:00:00:05:00;
    next;
19. lr_in_arp_request (northd.c:11795): 1, priority 0, uuid 27c79d22
    output;

egress(dp="lr_vcn3_net1", inport="lr_vcn3_net1-ls_vcn3_net1", outport="lr_vcn3_net1-lsb_vcn3_net1")
---------------------------------------------------------------------------------------------------
 0. lr_out_chk_dnat_local (northd.c:13021): 1, priority 0, uuid 60605710
    reg9[4] = 0;
    next;
 6. lr_out_delivery (northd.c:11843): outport == "lr_vcn3_net1-lsb_vcn3_net1", priority 100, uuid 0ca6195d
    output;
    /* output to "lr_vcn3_net1-lsb_vcn3_net1", type "patch" */

ingress(dp="ls_vcn3_backbone", inport="lsb_vcn3_net1-lr_vcn3_net1")
-------------------------------------------------------------------
 0. ls_in_port_sec_l2 (northd.c:5493): inport == "lsb_vcn3_net1-lr_vcn3_net1", priority 50, uuid b32ddca1
    next;
 5. ls_in_pre_acl (northd.c:5640): ip && inport == "lsb_vcn3_net1-lr_vcn3_net1", priority 110, uuid ba4adcd0
    next;
 6. ls_in_pre_lb (northd.c:5640): ip && inport == "lsb_vcn3_net1-lr_vcn3_net1", priority 110, uuid d1a8a9c5
    next;
 8. ls_in_acl_hint (northd.c:6019): !ct.new && ct.est && !ct.rpl && ct_label.blocked == 0, priority 4, uuid 2712c6a2
    reg0[8] = 1;
    reg0[10] = 1;
    next;
22. ls_in_l2_lkup (northd.c:8289): eth.dst == 40:44:00:00:05:00, priority 50, uuid cc11ddc9
    outport = "lsb_vcn3_stgw-lr_vcn3_stgw";
    output;

egress(dp="ls_vcn3_backbone", inport="lsb_vcn3_net1-lr_vcn3_net1", outport="lsb_vcn3_stgw-lr_vcn3_stgw") *<--- Does not look like any conntrack estblished on the switch.*
--------------------------------------------------------------------------------------------------------
 0. ls_out_pre_lb (northd.c:5643): ip && outport == "lsb_vcn3_stgw-lr_vcn3_stgw", priority 110, uuid e2f6ec8c
    next;
 1. ls_out_pre_acl (northd.c:5643): ip && outport == "lsb_vcn3_stgw-lr_vcn3_stgw", priority 110, uuid a79ed7f1
    next;
 3. ls_out_acl_hint (northd.c:6019): !ct.new && ct.est && !ct.rpl && ct_label.blocked == 0, priority 4, uuid 930df986
    reg0[8] = 1;
    reg0[10] = 1;
    next;
 4. ls_out_acl (northd.c:6244): reg0[8] == 1 && (outport == @pg_vcn3_net1_sl3 && ip4.src == 192.16.1.0/24 && udp.dst == 111), priority 28000, uuid 159ff341
    next;
 9. ls_out_port_sec_l2 (northd.c:5591): outport == "lsb_vcn3_stgw-lr_vcn3_stgw", priority 50, uuid b6d24444
    output;
    /* output to "lsb_vcn3_stgw-lr_vcn3_stgw", type "patch" */

ingress(dp="lr_vcn3_stgw", inport="lr_vcn3_stgw-lsb_vcn3_stgw")
---------------------------------------------------------------
 0. lr_in_admission (northd.c:10519): eth.dst == 40:44:00:00:05:00 && inport == "lr_vcn3_stgw-lsb_vcn3_stgw", priority 50, uuid 6bbbb2f9
    xreg0[0..47] = 40:44:00:00:05:00;
    next;
 1. lr_in_lookup_neighbor (northd.c:10662): 1, priority 0, uuid d3159b2b
    reg9[2] = 1;
    next;
 2. lr_in_learn_neighbor (northd.c:10671): reg9[2] == 1, priority 100, uuid bef4eddc
    next;
10. lr_in_ip_routing_pre (northd.c:10905): 1, priority 0, uuid c7269d9a
    reg7 = 0;
    next;
11. lr_in_ip_routing (northd.c:9435): reg7 == 0 && ip4.dst == 192.16.0.0/16, priority 49, uuid 4bb6bae4
    ip.ttl--;
    reg8[0..15] = 0;
    reg0 = 253.255.25.1;
    reg1 = 253.255.25.10;
    eth.src = 40:44:00:00:05:00;
    outport = "lr_vcn3_stgw-lsb_vcn3_stgw";
    flags.loopback = 1;
    next;
12. lr_in_ip_routing_ecmp (northd.c:10980): reg8[0..15] == 0, priority 150, uuid 5aa40905
    next;
13. lr_in_policy (northd.c:8667): ip4.dst == 192.16.1.106, priority 100, uuid 1fbe521c
    reg0 = 253.255.0.2;
    reg1 = 253.255.80.20;
    eth.src = 40:44:00:00:05:01;
    outport = "lr_vcn3_stgw-ls_vcn3_external_stgw";
    flags.loopback = 1;
    reg8[0..15] = 0;
    next;
14. lr_in_policy_ecmp (northd.c:11115): reg8[0..15] == 0, priority 150, uuid 3f7c2e78
    next;
15. lr_in_arp_resolve (northd.c:11149): ip4, priority 0, uuid 8070025f
    get_arp(outport, reg0);
    /* MAC binding to 98:03:9b:59:af:24. */
    next;
18. lr_in_gw_redirect (northd.c:11716): outport == "lr_vcn3_stgw-ls_vcn3_external_stgw", priority 50, uuid 7a07c64e
    outport = "cr-lr_vcn3_stgw-ls_vcn3_external_stgw";
    next;
19. lr_in_arp_request (northd.c:11795): 1, priority 0, uuid 27c79d22
    output;
    /* Replacing type "chassisredirect" outport "cr-lr_vcn3_stgw-ls_vcn3_external_stgw" with distributed port "lr_vcn3_stgw-ls_vcn3_external_stgw". */

egress(dp="lr_vcn3_stgw", inport="lr_vcn3_stgw-lsb_vcn3_stgw", outport="lr_vcn3_stgw-ls_vcn3_external_stgw")
------------------------------------------------------------------------------------------------------------
 0. lr_out_chk_dnat_local (northd.c:13021): 1, priority 0, uuid 60605710
    reg9[4] = 0;
    next;
 3. lr_out_snat (northd.c:12774): ip && ip4.src == 192.16.1.6 && outport == "lr_vcn3_stgw-ls_vcn3_external_stgw" && is_chassis_resident("cr-lr_vcn3_stgw-ls_vcn3_external_stgw"), priority 161, uuid a6cc7e3c
    ct_snat_in_czone(253.255.80.8);

ct_snatin_czone(ip4.src=253.255.80.8)
-------------------------------------
 6. lr_out_delivery (northd.c:11843): outport == "lr_vcn3_stgw-ls_vcn3_external_stgw", priority 100, uuid 5b43ad83
    output;
    /* output to "lr_vcn3_stgw-ls_vcn3_external_stgw", type "patch" */

ingress(dp="ls_vcn3_external_stgw", inport="ls_vcn3_external_stgw-lr_vcn3_stgw")
--------------------------------------------------------------------------------
 0. ls_in_port_sec_l2 (northd.c:5493): inport == "ls_vcn3_external_stgw-lr_vcn3_stgw", priority 50, uuid 311f5f1a
    next;
 6. ls_in_pre_lb (northd.c:5640): ip && inport == "ls_vcn3_external_stgw-lr_vcn3_stgw", priority 110, uuid f122a239
    next;
22. ls_in_l2_lkup (northd.c:7494): 1, priority 0, uuid 0432699a
    outport = get_fdb(eth.dst);
    next;
23. ls_in_l2_unknown (northd.c:7499): outport == "none", priority 50, uuid c66c5cf1
    outport = "_MC_unknown";
    output;

multicast(dp="ls_vcn3_external_stgw", mcgroup="_MC_unknown")
------------------------------------------------------------

    egress(dp="ls_vcn3_external_stgw", inport="ls_vcn3_external_stgw-lr_vcn3_stgw", outport="ln-ls_vcn3_external_stgw")
-------------------------------------------------------------------------------------------------------------------
         0. ls_out_pre_lb (northd.c:5643): ip && outport == "ln-ls_vcn3_external_stgw", priority 110, uuid 9e2e1e50
            next;
         9. ls_out_port_sec_l2 (northd.c:5591): outport == "ln-ls_vcn3_external_stgw", priority 50, uuid 33e53686
            output;
            /* output to "ln-ls_vcn3_external_stgw", type "localnet" */




More Details on the config
============================
============================

lr_vcn3_stgw
=============
Routing Tables
---------------
192.16.0.0/16              253.255.25.1 dst-ip lr_vcn3_stgw-lsb_vcn3_stgw
   0.0.0.0/0               253.255.0.2 dst-ip lr_vcn3_stgw-ls_vcn3_external_stgw

Policy Routing
--------------
100  ip4.dst == 192.16.1.106  reroute 253.255.0.2

lr_vcn3_net1
============

Policy Routing
--------------
100  ip4.dst == 192.16.1.106  reroute 253.255.25.10

br-ext flows
=============
priority=1013,ip,in_port=216,nw_dst=192.16.1.106 actions=mod_nw_dst:253.255.0.2,output:1 priority=913,ip,in_port=1,nw_src=253.255.0.2,nw_dst=253.255.80.8 actions=mod_nw_src:192.16.1.106,output:216




Failing ACLs - that Should Work
=================================
ovn-nbctl list Port_Group
_uuid               : a4de7036-896e-4e54-a466-8a44f9a87960
acls                : [1d2e36f9-47ca-4e8a-a0c6-587df26f0f3e, 44a4c403-ac29-4579-a771-0963d1f1fc4a,                        bad8f976-a87d-47e4-805b-a3bf8057bed8, c7655e9a-9eb8-48fc-8d25-6ca17d303e28,                        ce002242-457b-48e8-b40f-77419cee43fb, dd9bbafd-2e91-42bd-b1ad-df11b71850fe,                        fc345e12-bfaf-498b-a011-bc4eeba31670, fc6b6c71-6171-43d1-ba97-3e5e1a43065c]
external_ids        : {}
name                : pg_vcn3_net1_sl3
ports               : [/306e0eab-6b23-405c-a38c-918c1b2e795d/, *f8819747-84cf-4019-9028-690dff014bc1*]


ovn-nbctl lsp-list ls_vcn3_backbone | grep stgw
306e0eab-6b23-405c-a38c-918c1b2e795d (lsb_vcn3_stgw-lr_vcn3_stgw)

ovn-nbctl lsp-list ls_vcn3_net1
*f8819747-84cf-4019-9028-690dff014bc1* (284195d2-9280-4334-900e-571ecd00327a)
/295f1e55-a9e5-42f9-bb8c-a679bcfa084d/ (ls_vcn3_net1-lr_vcn3_net1)


ovn-nbctl acl-list pg_vcn3_net1_sl3
=====================================
Egress From VM - Ingress to switch
-----------------------------------
from-lport 32767 (inport == @pg_vcn3_net1_sl3 && (arp || udp.dst == 67 || udp.dst == 68)) allow-related from-lport 27000 (inport == @pg_vcn3_net1_sl3 && ip4.dst == 192.16.1.0/24 && udp.dst == 111) allow-related from-lport     0 (inport == @pg_vcn3_net1_sl3) drop log(name=fss-8,severity=debug) <------- Drops

Ingress TO VM - Egress from switch
------------------------------------
  to-lport 32767 (outport == @pg_vcn3_net1_sl3 && (arp || udp.dst == 67 || udp.dst == 68)) allow-related   to-lport 27000 (outport == @pg_vcn3_net1_sl3 && ip4.src == 192.16.1.0/24 && tcp.dst == 111) allow-related   to-lport 27000 (outport == @pg_vcn3_net1_sl3 && ip4.src == 192.16.1.0/24 && tcp.dst == 20048) allow-related   to-lport 27000 (outport == @pg_vcn3_net1_sl3 && ip4.src == 192.16.1.0/24 && udp.dst == 111) allow-related <------- But this should   to-lport     0 (outport == @pg_vcn3_net1_sl3) drop log(name=fss-17,severity=debug) have allowed the                                                                                                                                                                       &n bsp;                                              return pkt
Drop Message
=============
*name="fss-8", verdict=drop, udp,dl_src=40:44:00:00:05:00,dl_dst=40:44:00:00:00:a0,nw_src=192.16.1.106,nw_dst=192.16.1.6,tp_src=111,tp_dst=755*

tcpdump on VM
--------------
52:54:00:02:55:96 > 40:44:00:00:00:90, ethertype IPv4, proto UDP (17)
    192.16.1.6.755 > 192.16.1.106.111


tcpdump on underlay NFS Server
------------------------------
40:44:00:00:05:01 > 98:03:9b:59:af:24, ethertype IPv4, proto UDP (17)
    253.255.80.8.755 > 253.255.0.2.111:

98:03:9b:59:af:24 > 40:44:00:00:05:01, ethertype IPv4, proto UDP (17)
    253.255.0.2.111 > 253.255.80.8.755:



ovn-nbctl show
===============
switch 18e9d8e6-1cbc-4d4f-afc1-caec9aecf569 (ls_vcn3_net1)
    port 284195d2-9280-4334-900e-571ecd00327a
        addresses: ["52:54:00:02:55:96 192.16.1.6"]
    port ls_vcn3_net1-lr_vcn3_net1
        type: router
        addresses: ["40:44:00:00:00:90"]
        router-port: lr_vcn3_net1-ls_vcn3_net1


switch 7f43d2e4-f146-40d9-8be5-a7b75b319e75 (ls_vcn3_backbone)
    port lsb_vcn3_net1-lr_vcn3_net1
        type: router
        router-port: lr_vcn3_net1-lsb_vcn3_net1
    port lsb_vcn3_stgw-lr_vcn3_stgw
        type: router
        router-port: lr_vcn3_stgw-lsb_vcn3_stgw


switch a8e0c8fe-872d-4bfc-bdd9-90063a196603 (ls_vcn3_external_stgw)
    port ls_vcn3_external_stgw-lr_vcn3_stgw
        type: router
        router-port: lr_vcn3_stgw-ls_vcn3_external_stgw
    port ln-ls_vcn3_external_stgw
        type: localnet
        addresses: ["unknown"]

router 10f1c098-e5cc-4f85-b8a1-33c49356fd1c (lr_vcn3_net1)
    port lr_vcn3_net1-ls_vcn3_net1
        mac: "40:44:00:00:00:90"
        networks: ["192.16.1.1/24"]
    port lr_vcn3_net1-lsb_vcn3_net1
        mac: "40:44:00:00:00:a0"
        networks: ["253.255.25.1/25"]

router a63b3879-b694-45c5-ac97-75df53b5ca66 (lr_vcn3_stgw)
    port lr_vcn3_stgw-lsb_vcn3_stgw
        mac: "40:44:00:00:05:00"
        networks: ["253.255.25.10/25"]
    port lr_vcn3_stgw-ls_vcn3_external_stgw
        mac: "40:44:00:00:05:01"
        networks: ["253.255.80.20/16", "253.255.80.8/16"]
        gateway chassis: [sca15-rain06 sca15-rain17 sca15-rain05]
    nat 909bf813-7f7e-4eea-b460-5261529fcd5d
        external ip: "253.255.80.8"
        logical ip: "192.16.1.6"
        type: "snat"

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