[ovs-dev] [RFC ovn] ovn: introduce IP_SRC_POLICY stage in ingress router pipeline
Lorenzo Bianconi
lorenzo.bianconi at redhat.com
Fri May 15 15:49:49 UTC 2020
In order to fix the issues introduced by commit
c0bf32d72f8b ("Manage ARP process locally in a DVR scenario "), restore
previous configuration of table 9 in ingress router pipeline and
introduce a new stage called 'ip_src_policy' used to set the src address
info in order to not distribute FIP traffic if DVR is enabled
Fixes: c0bf32d72f8b ("Manage ARP process locally in a DVR scenario ")
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi at redhat.com>
---
northd/ovn-northd.8.xml | 65 ++++++++++++++++++++---------------------
northd/ovn-northd.c | 38 ++++++++++--------------
tests/ovn.at | 28 +++++-------------
3 files changed, 54 insertions(+), 77 deletions(-)
diff --git a/northd/ovn-northd.8.xml b/northd/ovn-northd.8.xml
index 8f224b07f..09dbb52b4 100644
--- a/northd/ovn-northd.8.xml
+++ b/northd/ovn-northd.8.xml
@@ -2484,37 +2484,6 @@ output;
</p>
</li>
- <li>
- <p>
- For distributed logical routers where one of the logical router ports
- specifies a <code>redirect-chassis</code>, a priority-400 logical
- flow for each <code>dnat_and_snat</code> NAT rules configured.
- These flows will allow to properly forward traffic to the external
- connections if available and avoid sending it through the tunnel.
- Assuming the following NAT rule has been configured:
- </p>
-
- <pre>
-external_ip = <var>A</var>;
-external_mac = <var>B</var>;
-logical_ip = <var>C</var>;
- </pre>
-
- <p>
- the following action will be applied:
- </p>
-
- <pre>
-ip.ttl--;
-reg0 = <var>ip.dst</var>;
-reg1 = <var>A</var>;
-eth.src = <var>B</var>;
-outport = <var>router-port</var>;
-next;
- </pre>
-
- </li>
-
<li>
<p>
IPv4 routing table. For each route to IPv4 network <var>N</var> with
@@ -2660,7 +2629,35 @@ outport = <var>P</var>;
</li>
</ul>
- <h3>Ingress Table 12: ARP/ND Resolution</h3>
+ <h3>Ingress Table 12: IP Source Policy</h3>
+
+ <p>
+ This table contains for distributed logical routers where one of
+ the logical router ports specifies a <code>redirect-chassis</code>,
+ a priority-100 logical flow for each <code>dnat_and_snat</code>
+ NAT rules configured.
+ These flows will allow to properly forward traffic to the external
+ connections if available and avoid sending it through the tunnel.
+ Assuming the following NAT rule has been configured:
+ </p>
+
+ <pre>
+external_ip = <var>A</var>;
+external_mac = <var>B</var>;
+logical_ip = <var>C</var>;
+ </pre>
+
+ <p>
+ the following action will be applied:
+ </p>
+
+ <pre>
+reg1 = <var>A</var>;
+eth.src = <var>B</var>;
+next;
+ </pre>
+
+ <h3>Ingress Table 13: ARP/ND Resolution</h3>
<p>
Any packet that reaches this table is an IP packet whose next-hop
@@ -2819,7 +2816,7 @@ outport = <var>P</var>;
</ul>
- <h3>Ingress Table 13: Check packet length</h3>
+ <h3>Ingress Table 14: Check packet length</h3>
<p>
For distributed logical routers with distributed gateway port configured
@@ -2849,7 +2846,7 @@ REGBIT_PKT_LARGER = check_pkt_larger(<var>L</var>); next;
and advances to the next table.
</p>
- <h3>Ingress Table 14: Handle larger packets</h3>
+ <h3>Ingress Table 15: Handle larger packets</h3>
<p>
For distributed logical routers with distributed gateway port configured
diff --git a/northd/ovn-northd.c b/northd/ovn-northd.c
index 3c0070ea7..d5f3997a9 100644
--- a/northd/ovn-northd.c
+++ b/northd/ovn-northd.c
@@ -175,11 +175,12 @@ enum ovn_stage {
PIPELINE_STAGE(ROUTER, IN, IP_ROUTING, 9, "lr_in_ip_routing") \
PIPELINE_STAGE(ROUTER, IN, IP_ROUTING_ECMP, 10, "lr_in_ip_routing_ecmp") \
PIPELINE_STAGE(ROUTER, IN, POLICY, 11, "lr_in_policy") \
- PIPELINE_STAGE(ROUTER, IN, ARP_RESOLVE, 12, "lr_in_arp_resolve") \
- PIPELINE_STAGE(ROUTER, IN, CHK_PKT_LEN , 13, "lr_in_chk_pkt_len") \
- PIPELINE_STAGE(ROUTER, IN, LARGER_PKTS, 14,"lr_in_larger_pkts") \
- PIPELINE_STAGE(ROUTER, IN, GW_REDIRECT, 15, "lr_in_gw_redirect") \
- PIPELINE_STAGE(ROUTER, IN, ARP_REQUEST, 16, "lr_in_arp_request") \
+ PIPELINE_STAGE(ROUTER, IN, IP_SRC_POLICY, 12, "lr_in_ip_src_policy") \
+ PIPELINE_STAGE(ROUTER, IN, ARP_RESOLVE, 13, "lr_in_arp_resolve") \
+ PIPELINE_STAGE(ROUTER, IN, CHK_PKT_LEN , 14, "lr_in_chk_pkt_len") \
+ PIPELINE_STAGE(ROUTER, IN, LARGER_PKTS, 15,"lr_in_larger_pkts") \
+ PIPELINE_STAGE(ROUTER, IN, GW_REDIRECT, 16, "lr_in_gw_redirect") \
+ PIPELINE_STAGE(ROUTER, IN, ARP_REQUEST, 17, "lr_in_arp_request") \
\
/* Logical router egress stages. */ \
PIPELINE_STAGE(ROUTER, OUT, UNDNAT, 0, "lr_out_undnat") \
@@ -7103,8 +7104,6 @@ build_routing_policy_flow(struct hmap *lflows, struct ovn_datapath *od,
ds_destroy(&actions);
}
-/* default logical flow prioriry for distributed routes */
-#define DROUTE_PRIO 400
struct parsed_route {
struct ovs_list list_node;
struct v46_ip prefix;
@@ -7493,7 +7492,7 @@ build_ecmp_route_flow(struct hmap *lflows, struct ovn_datapath *od,
}
static void
-add_distributed_routes(struct hmap *lflows, struct ovn_datapath *od)
+add_ip_src_policy_flows(struct hmap *lflows, struct ovn_datapath *od)
{
struct ds actions = DS_EMPTY_INITIALIZER;
struct ds match = DS_EMPTY_INITIALIZER;
@@ -7511,12 +7510,9 @@ add_distributed_routes(struct hmap *lflows, struct ovn_datapath *od)
is_ipv4 ? "4" : "6", nat->logical_ip,
nat->logical_port);
char *prefix = is_ipv4 ? "" : "xx";
- ds_put_format(&actions, "outport = %s; eth.src = %s; "
- "%sreg0 = ip%s.dst; %sreg1 = %s; next;",
- od->l3dgw_port->json_key, nat->external_mac,
- prefix, is_ipv4 ? "4" : "6",
- prefix, nat->external_ip);
- ovn_lflow_add(lflows, od, S_ROUTER_IN_IP_ROUTING, DROUTE_PRIO,
+ ds_put_format(&actions, "eth.src = %s; %sreg1 = %s; next;",
+ nat->external_mac, prefix, nat->external_ip);
+ ovn_lflow_add(lflows, od, S_ROUTER_IN_IP_SRC_POLICY, 100,
ds_cstr(&match), ds_cstr(&actions));
ds_clear(&match);
ds_clear(&actions);
@@ -7547,12 +7543,6 @@ add_route(struct hmap *lflows, const struct ovn_port *op,
}
build_route_match(op_inport, network_s, plen, is_src_route, is_ipv4,
&match, &priority);
- /* traffic for internal IPs of logical switch ports must be sent to
- * the gw controller through the overlay tunnels
- */
- if (op->nbrp && !op->nbrp->n_gateway_chassis) {
- priority += DROUTE_PRIO;
- }
struct ds actions = DS_EMPTY_INITIALIZER;
ds_put_format(&actions, "ip.ttl--; "REG_ECMP_GROUP_ID" = 0; %sreg0 = ",
@@ -9519,9 +9509,13 @@ build_lrouter_flows(struct hmap *datapaths, struct hmap *ports,
* logical router
*/
HMAP_FOR_EACH (od, key_node, datapaths) {
- if (od->nbr && od->l3dgw_port) {
- add_distributed_routes(lflows, od);
+ if (!od->nbr) {
+ continue;
+ }
+ if (od->l3dgw_port) {
+ add_ip_src_policy_flows(lflows, od);
}
+ ovn_lflow_add(lflows, od, S_ROUTER_IN_IP_SRC_POLICY, 0, "1", "next;");
}
/* Logical router ingress table IP_ROUTING & IP_ROUTING_ECMP: IP Routing.
diff --git a/tests/ovn.at b/tests/ovn.at
index f39fda2e4..fcc34fd5d 100644
--- a/tests/ovn.at
+++ b/tests/ovn.at
@@ -9637,20 +9637,6 @@ AT_CHECK([as hv3 ovs-vsctl set Open_vSwitch . external-ids:ovn-bridge-mappings=p
OVS_WAIT_UNTIL([test 1 = `as hv3 ovs-vsctl show | \
grep "Port patch-br-int-to-ln_port" | wc -l`])
-AT_CHECK([test 1 = `ovn-sbctl dump-flows lr0 | grep lr_in_ip_routing | \
-grep "ip4.src == 10.0.0.3 && is_chassis_resident(\"foo1\")" -c`])
-AT_CHECK([test 1 = `ovn-sbctl dump-flows lr0 | grep lr_in_ip_routing | \
-grep "ip4.src == 10.0.0.4 && is_chassis_resident(\"foo2\")" -c`])
-
-key=`ovn-sbctl --bare --columns tunnel_key list datapath_Binding lr0`
-# Check that the OVS flows appear for the dnat_and_snat entries in
-# lr_in_ip_routing table.
-OVS_WAIT_UNTIL([test 1 = `as hv3 ovs-ofctl dump-flows br-int table=17 | \
-grep "priority=400,ip,metadata=0x$key,nw_src=10.0.0.3" -c`])
-
-OVS_WAIT_UNTIL([test 1 = `as hv3 ovs-ofctl dump-flows br-int table=17 | \
-grep "priority=400,ip,metadata=0x$key,nw_src=10.0.0.4" -c`])
-
# Re-add nat-addresses option
ovn-nbctl lsp-set-options lrp0-rp router-port=lrp0 nat-addresses="router"
@@ -15141,7 +15127,7 @@ ovn-sbctl dump-flows lr0 | grep lr_in_arp_resolve | grep "reg0 == 10.0.0.10" \
# Since the sw0-vir is not claimed by any chassis, eth.dst should be set to
# zero if the ip4.dst is the virtual ip in the router pipeline.
AT_CHECK([cat lflows.txt], [0], [dnl
- table=12(lr_in_arp_resolve ), priority=100 , match=(outport == "lr0-sw0" && reg0 == 10.0.0.10), action=(eth.dst = 00:00:00:00:00:00; next;)
+ table=13(lr_in_arp_resolve ), priority=100 , match=(outport == "lr0-sw0" && reg0 == 10.0.0.10), action=(eth.dst = 00:00:00:00:00:00; next;)
])
ip_to_hex() {
@@ -15192,7 +15178,7 @@ ovn-sbctl dump-flows lr0 | grep lr_in_arp_resolve | grep "reg0 == 10.0.0.10" \
# There should be an arp resolve flow to resolve the virtual_ip with the
# sw0-p1's MAC.
AT_CHECK([cat lflows.txt], [0], [dnl
- table=12(lr_in_arp_resolve ), priority=100 , match=(outport == "lr0-sw0" && reg0 == 10.0.0.10), action=(eth.dst = 50:54:00:00:00:03; next;)
+ table=13(lr_in_arp_resolve ), priority=100 , match=(outport == "lr0-sw0" && reg0 == 10.0.0.10), action=(eth.dst = 50:54:00:00:00:03; next;)
])
# Forcibly clear virtual_parent. ovn-controller should release the binding
@@ -15233,7 +15219,7 @@ ovn-sbctl dump-flows lr0 | grep lr_in_arp_resolve | grep "reg0 == 10.0.0.10" \
# There should be an arp resolve flow to resolve the virtual_ip with the
# sw0-p2's MAC.
AT_CHECK([cat lflows.txt], [0], [dnl
- table=12(lr_in_arp_resolve ), priority=100 , match=(outport == "lr0-sw0" && reg0 == 10.0.0.10), action=(eth.dst = 50:54:00:00:00:05; next;)
+ table=13(lr_in_arp_resolve ), priority=100 , match=(outport == "lr0-sw0" && reg0 == 10.0.0.10), action=(eth.dst = 50:54:00:00:00:05; next;)
])
# send the garp from sw0-p2 (in hv2). hv2 should claim sw0-vir
@@ -15256,7 +15242,7 @@ ovn-sbctl dump-flows lr0 | grep lr_in_arp_resolve | grep "reg0 == 10.0.0.10" \
# There should be an arp resolve flow to resolve the virtual_ip with the
# sw0-p3's MAC.
AT_CHECK([cat lflows.txt], [0], [dnl
- table=12(lr_in_arp_resolve ), priority=100 , match=(outport == "lr0-sw0" && reg0 == 10.0.0.10), action=(eth.dst = 50:54:00:00:00:04; next;)
+ table=13(lr_in_arp_resolve ), priority=100 , match=(outport == "lr0-sw0" && reg0 == 10.0.0.10), action=(eth.dst = 50:54:00:00:00:04; next;)
])
# Now send arp reply from sw0-p1. hv1 should claim sw0-vir
@@ -15277,7 +15263,7 @@ ovn-sbctl dump-flows lr0 | grep lr_in_arp_resolve | grep "reg0 == 10.0.0.10" \
> lflows.txt
AT_CHECK([cat lflows.txt], [0], [dnl
- table=12(lr_in_arp_resolve ), priority=100 , match=(outport == "lr0-sw0" && reg0 == 10.0.0.10), action=(eth.dst = 50:54:00:00:00:03; next;)
+ table=13(lr_in_arp_resolve ), priority=100 , match=(outport == "lr0-sw0" && reg0 == 10.0.0.10), action=(eth.dst = 50:54:00:00:00:03; next;)
])
# Delete hv1-vif1 port. hv1 should release sw0-vir
@@ -15295,7 +15281,7 @@ ovn-sbctl dump-flows lr0 | grep lr_in_arp_resolve | grep "reg0 == 10.0.0.10" \
> lflows.txt
AT_CHECK([cat lflows.txt], [0], [dnl
- table=12(lr_in_arp_resolve ), priority=100 , match=(outport == "lr0-sw0" && reg0 == 10.0.0.10), action=(eth.dst = 00:00:00:00:00:00; next;)
+ table=13(lr_in_arp_resolve ), priority=100 , match=(outport == "lr0-sw0" && reg0 == 10.0.0.10), action=(eth.dst = 00:00:00:00:00:00; next;)
])
# Now send arp reply from sw0-p2. hv2 should claim sw0-vir
@@ -15316,7 +15302,7 @@ ovn-sbctl dump-flows lr0 | grep lr_in_arp_resolve | grep "reg0 == 10.0.0.10" \
> lflows.txt
AT_CHECK([cat lflows.txt], [0], [dnl
- table=12(lr_in_arp_resolve ), priority=100 , match=(outport == "lr0-sw0" && reg0 == 10.0.0.10), action=(eth.dst = 50:54:00:00:00:04; next;)
+ table=13(lr_in_arp_resolve ), priority=100 , match=(outport == "lr0-sw0" && reg0 == 10.0.0.10), action=(eth.dst = 50:54:00:00:00:04; next;)
])
# Delete sw0-p2 logical port
--
2.26.2
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