ovn-nbctl lr-route-list lr1
IPv4 Routes
0.0.0.0/0 253.255.0.1 dst-ip lr1-ls1_external
ovn-trace --detailed ls1 'inport ==
"47433b54-ac10-42f1-ae84-cc6fbb580297" && eth.dst == 40:44:00:00:01:30
&& eth.src == 52:54:00:be:06:16 && ip4.src == 192.16.1.6 && ip4.dst ==
10.68.49.184 && ip.ttl == 64 && icmp4.type == 8'
#
icmp,reg14=0x1,vlan_tci=0x0000,dl_src=52:54:00:be:06:16,dl_dst=40:44:00:00:01:30,nw_src=192.16.1.6,nw_dst=10.68.49.184,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0
ingress(dp="ls1", inport="47433b")
----------------------------------
0. ls_in_port_sec_l2 (ovn-northd.c:4834): inport == "47433b", priority
50, uuid ae50c799
next;
22. ls_in_l2_lkup (ovn-northd.c:7587): eth.dst == 40:44:00:00:01:30,
priority 50, uuid c29dec2a
outport = "ls1-lr1";
output;
egress(dp="ls1", inport="47433b", outport="ls1-lr1")
----------------------------------------------------
0. ls_out_pre_lb (ovn-northd.c:4980): ip && outport == "ls1-lr1",
priority 110, uuid d4d7c7af
next;
9. ls_out_port_sec_l2 (ovn-northd.c:4929): outport == "ls1-lr1",
priority 50, uuid 36b335f9
output;
/* output to "ls1-lr1", type "patch" */
ingress(dp="lr1", inport="lr1-ls1")
-----------------------------------
0. lr_in_admission (ovn-northd.c:9575): eth.dst == 40:44:00:00:01:30
&& inport == "lr1-ls1", priority 50, uuid c67387d7
xreg0[0..47] = 40:44:00:00:01:30;
next;
1. lr_in_lookup_neighbor (ovn-northd.c:9654): 1, priority 0, uuid c050ede1
reg9[2] = 1;
next;
2. lr_in_learn_neighbor (ovn-northd.c:9663): reg9[2] == 1, priority
100, uuid e5780577
next;
10. lr_in_ip_routing (ovn-northd.c:8622): ip4.dst == 0.0.0.0/0, priority
1, uuid 52d001c6
ip.ttl--;
reg8[0..15] = 0;
reg0 = 253.255.0.1;
reg1 = 253.255.80.10;
eth.src = 40:44:00:00:01:a0;
outport = "lr1-ls1_external";
flags.loopback = 1;
next;
11. lr_in_ip_routing_ecmp (ovn-northd.c:9921): reg8[0..15] == 0,
priority 150, uuid 920ee40c
next;
12. lr_in_policy (ovn-northd.c:10046): 1, priority 0, uuid e2014343
reg8[0..15] = 0;
next;
13. lr_in_policy_ecmp (ovn-northd.c:10048): reg8[0..15] == 0, priority
150, uuid ed8c4d4d
next;
14. lr_in_arp_resolve (ovn-northd.c:10082): ip4, priority 0, uuid 2cfde30a
get_arp(outport, reg0);
/* MAC binding to 00:00:0c:07:ac:14. */
next;
17. lr_in_gw_redirect (ovn-northd.c:10598): outport ==
"lr1-ls1_external", priority 50, uuid 521a9223
outport = "cr-lr1-ls1_external";
next;
18. lr_in_arp_request (ovn-northd.c:10671): 1, priority 0, uuid e43fdfbd
output;
/* Replacing type "chassisredirect" outport "cr-lr1-ls1_external"
with distributed port "lr1-ls1_external". */
egress(dp="lr1", inport="lr1-ls1", outport="lr1-ls1_external")
--------------------------------------------------------------
0. lr_out_undnat (ovn-northd.c:11459): ip && ip4.src == 192.16.1.6 &&
outport == "lr1-ls1_external" &&
is_chassis_resident("cr-lr1-ls1_external"), priority 100, uuid e8b081df
ct_dnat;
ct_dnat /* assuming no un-dnat entry, so no change */
-----------------------------------------------------
1. lr_out_snat (ovn-northd.c:11552): ip && ip4.src == 192.16.1.6 &&
outport == "lr1-ls1_external" &&
is_chassis_resident("cr-lr1-ls1_external"), priority 161, uuid f50e5215
ct_snat(10.68.49.185);
ct_snat(ip4.src=10.68.49.185)
-----------------------------
2. lr_out_egr_loop (ovn-northd.c:11846): ip4.dst == 10.68.49.184 &&
outport == "lr1-ls1_external" &&
is_chassis_resident("cr-lr1-ls1_external"), priority 100, uuid a6499050
clone { ct_clear; inport = outport; outport = ""; flags = 0;
flags.loopback = 1; reg0 = 0; reg1 = 0; reg2 = 0; reg3 = 0; reg4 = 0;
reg5 = 0; reg6 = 0; reg7 = 0; reg8 = 0; reg9 = 0; reg9[0] = 1;
next(pipeline=ingress, table=0); };
clone
-----
ct_clear;
inport = outport;
outport = "";
flags = 0;
flags.loopback = 1;
reg0 = 0;
reg1 = 0;
reg2 = 0;
reg3 = 0;
reg4 = 0;
reg5 = 0;
reg6 = 0;
reg7 = 0;
reg8 = 0;
reg9 = 0;
reg9[0] = 1;
next(pipeline=ingress, table=0);
ingress(dp="lr1", inport="lr1-ls1_external")
--------------------------------------------
0. lr_in_admission: no match (implicit drop)
If we look at the section of code pointed to by ovn-northd.c:11846
/* Egress Loopback table: For NAT on a distributed router.
* If packets in the egress pipeline on the distributed
* gateway port have ip.dst matching a NAT external IP, then
* loop a clone of the packet back to the beginning of the
* ingress pipeline with inport = outport. */
if (od->l3dgw_port) {
/* Distributed router. */
ds_clear(match);
ds_put_format(match, "ip%s.dst == %s && outport == %s",
is_v6 ? "6" : "4",
nat->external_ip,
od->l3dgw_port->json_key);
if (!distributed) {
ds_put_format(match, " && is_chassis_resident(%s)",
od->l3redirect_port->json_key);
} else {
ds_put_format(match, " && is_chassis_resident(\"%s\")",
nat->logical_port);
}
ds_clear(actions);
ds_put_format(actions,
"clone { ct_clear; "
"inport = outport; outport = \"\"; "
"flags = 0; flags.loopback = 1; ");
for (int j = 0; j < MFF_N_LOG_REGS; j++) {
ds_put_format(actions, "reg%d = 0; ", j);
}
ds_put_format(actions, REGBIT_EGRESS_LOOPBACK" = 1; "
"next(pipeline=ingress, table=%d); };",
ovn_stage_get_table(S_ROUTER_IN_ADMISSION));
ovn_lflow_add_with_hint(lflows, od, S_ROUTER_OUT_EGR_LOOP, 100,
ds_cstr(match), ds_cstr(actions),
&nat->header_);
}
It seems clear what the intent is, but the pkt is dropped immediately
when returned to the ingress
pipeline. Am I missing some config?
Thanks Brendan
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