[ovs-dev] [PATCH v3 ovn 2/2] ovn-northd: Support mixing stateless/stateful ACLs with Stateless_Filter.

Dumitru Ceara dceara at redhat.com
Wed Sep 2 15:05:24 UTC 2020


A new table is added to OVN_Northbound: Stateless_Filter. Users can
populate this table with records consisting of <priority, match>. These
records generate logical flows in the PRE_ACL stages of the logical
switch pipeline.

Packets matching these flows will completely bypass connection tracking
for ACL purposes. In specific scenarios CMSs can predetermine which
traffic must be firewalled statefully or not, e.g., UDP vs TCP. However,
until now, if at least one stateful ACL (allow-related) is configured
on the switch, all traffic gets sent to connection tracking.
This induces a hit in performance when forwarding packets that don't
need stateful processing.

New command line arguments are added to ovn-nbctl (stateless-filter-*)
to allow the users to interact with the Stateless_Filter table.

Signed-off-by: Dumitru Ceara <dceara at redhat.com>
---
 NEWS                          |    3 
 northd/ovn-northd.8.xml       |   25 ++++
 northd/ovn-northd.c           |   95 +++++++++++++--
 ovn-nb.ovsschema              |   26 ++++
 ovn-nb.xml                    |   56 ++++++++-
 tests/ovn-nbctl.at            |   53 ++++++++
 tests/ovn-northd.at           |  263 +++++++++++++++++++++++++++++++++++++++++
 tests/system-common-macros.at |    8 +
 tests/system-ovn.at           |  113 ++++++++++++++++++
 utilities/ovn-detrace.in      |   12 ++
 utilities/ovn-nbctl.c         |  213 ++++++++++++++++++++++++++++++++-
 11 files changed, 840 insertions(+), 27 deletions(-)

diff --git a/NEWS b/NEWS
index a1ce4e8..eedd091 100644
--- a/NEWS
+++ b/NEWS
@@ -11,6 +11,9 @@ Post-v20.06.0
      called Chassis_Private now contains the nb_cfg column which is updated
      by incrementing the value in the NB_Global table, CMSes relying on
      this mechanism should update their code to use this new table.
+   - Added support for bypassing connection tracking for ACL processing for
+     specific types of traffic through the user supplied Stateless_Filter
+     configuration.
 
 OVN v20.06.0
 --------------------------
diff --git a/northd/ovn-northd.8.xml b/northd/ovn-northd.8.xml
index 226afc8..4e190d8 100644
--- a/northd/ovn-northd.8.xml
+++ b/northd/ovn-northd.8.xml
@@ -322,6 +322,16 @@
     </p>
 
     <p>
+      For each record in table <code>Stateless_Filter</code> in the
+      <code>OVN_Northbound</code> database, a flow with
+      <code>priority + 1000</code> is added and sets <code>reg0[11] = 1</code>
+      for traffic that matches the condition in the <code>match</code>
+      column and advances to next table.  <code>reg0[11]</code> acts as a hint
+      for tables <code>ACL hints</code> and <code>ACL</code> to avoid
+      sending this traffic to the connection tracker.
+    </p>
+
+    <p>
       This table also has a priority-110 flow with the match
       <code>eth.dst == <var>E</var></code> for all logical switch
       datapaths to move traffic to the next table. Where <var>E</var>
@@ -422,6 +432,11 @@
     </p>
     <ul>
       <li>
+        A priority-8 flow that matches on packets that have been marked
+        for stateless ACL processing.  This flow sets <code>reg0[8]</code>
+        and <code>reg0[9]</code> and then advances to the next table.
+      </li>
+      <li>
         A priority-7 flow that matches on packets that initiate a new session.
         This flow sets <code>reg0[7]</code> and <code>reg0[9]</code> and
         then advances to the next table.
@@ -1445,6 +1460,16 @@ output;
     </p>
 
     <p>
+      For each record in table <code>Stateless_Filter</code> in the
+      <code>OVN_Northbound</code> database, a flow with
+      <code>priority + 1000</code> is added and sets <code>reg0[11] = 1</code>
+      for traffic that matches the condition in the <code>match</code>
+      column and advances to next table.  <code>reg0[11]</code> acts as a hint
+      for tables <code>ACL hints</code> and <code>ACL</code> to avoid
+      sending this traffic to the connection tracker.
+    </p>
+
+    <p>
       This table also has a priority-110 flow with the match
       <code>eth.src == <var>E</var></code> for all logical switch
       datapaths to move traffic to the next table. Where <var>E</var>
diff --git a/northd/ovn-northd.c b/northd/ovn-northd.c
index 2025446..cf27431 100644
--- a/northd/ovn-northd.c
+++ b/northd/ovn-northd.c
@@ -218,6 +218,7 @@ enum ovn_stage {
 #define REGBIT_ACL_HINT_ALLOW     "reg0[8]"
 #define REGBIT_ACL_HINT_DROP      "reg0[9]"
 #define REGBIT_ACL_HINT_BLOCK     "reg0[10]"
+#define REGBIT_SKIP_ACL_CT        "reg0[11]"
 
 /* Register definitions for switches and routers. */
 
@@ -4889,7 +4890,47 @@ skip_port_from_conntrack(struct ovn_datapath *od, struct ovn_port *op,
 }
 
 static void
-build_pre_acls(struct ovn_datapath *od, struct hmap *lflows)
+build_stateless_filter(struct ovn_datapath *od,
+                       const struct nbrec_stateless_filter *filter,
+                       struct hmap *lflows)
+{
+    /* Stateless filters must be applied in both directions so that reply
+     * traffic bypasses conntrack too.
+     */
+    ovn_lflow_add_with_hint(lflows, od, S_SWITCH_IN_PRE_ACL,
+                            filter->priority + OVN_ACL_PRI_OFFSET,
+                            filter->match,
+                            REGBIT_SKIP_ACL_CT" = 1; next;",
+                            &filter->header_);
+    ovn_lflow_add_with_hint(lflows, od, S_SWITCH_OUT_PRE_ACL,
+                            filter->priority + OVN_ACL_PRI_OFFSET,
+                            filter->match,
+                            REGBIT_SKIP_ACL_CT" = 1; next;",
+                            &filter->header_);
+}
+
+static void
+build_stateless_filters(struct ovn_datapath *od, struct hmap *port_groups,
+                        struct hmap *lflows)
+{
+    for (size_t i = 0; i < od->nbs->n_stateless_filters; i++) {
+        build_stateless_filter(od, od->nbs->stateless_filters[i], lflows);
+    }
+
+    struct ovn_port_group *pg;
+    HMAP_FOR_EACH (pg, key_node, port_groups) {
+        if (ovn_port_group_ls_find(pg, &od->nbs->header_.uuid)) {
+            for (size_t i = 0; i < pg->nb_pg->n_stateless_filters; i++) {
+                build_stateless_filter(od, pg->nb_pg->stateless_filters[i],
+                                       lflows);
+            }
+        }
+    }
+}
+
+static void
+build_pre_acls(struct ovn_datapath *od, struct hmap *port_groups,
+               struct hmap *lflows)
 {
     bool has_stateful = has_stateful_acl(od);
 
@@ -4934,6 +4975,13 @@ build_pre_acls(struct ovn_datapath *od, struct hmap *lflows)
                       "nd || nd_rs || nd_ra || "
                       "(udp && udp.src == 546 && udp.dst == 547)", "next;");
 
+        /* Ingress and Egress Pre-ACL Table (Stateless_Filter).
+         *
+         * If the logical switch is configured to bypass conntrack for
+         * specific types of traffic, skip conntrack for that traffic.
+         */
+        build_stateless_filters(od, port_groups, lflows);
+
         /* Ingress and Egress Pre-ACL Table (Priority 100).
          *
          * Regardless of whether the ACL is "from-lport" or "to-lport",
@@ -5170,6 +5218,15 @@ build_acl_hints(struct ovn_datapath *od, struct hmap *lflows)
     for (size_t i = 0; i < ARRAY_SIZE(stages); i++) {
         enum ovn_stage stage = stages[i];
 
+        /* Traffic that matches a Stateless_Filter may hit both allow or
+         * drop ACLs but should never commit connections to conntrack. Only
+         * set REGBIT_ACL_HINT_ALLOW and REGBIT_ACL_HINT_DROP.
+         */
+        ovn_lflow_add(lflows, od, stage, 8, REGBIT_SKIP_ACL_CT " == 1",
+                      REGBIT_ACL_HINT_ALLOW " = 1; "
+                      REGBIT_ACL_HINT_DROP " = 1; "
+                      "next;");
+
         /* New, not already established connections, may hit either allow
          * or drop ACLs. For allow ACLs, the connection must also be committed
          * to conntrack so we set REGBIT_ACL_HINT_ALLOW_NEW.
@@ -5383,7 +5440,7 @@ consider_acl(struct hmap *lflows, struct ovn_datapath *od,
             struct ds match = DS_EMPTY_INITIALIZER;
             struct ds actions = DS_EMPTY_INITIALIZER;
 
-            /* Commit the connection tracking entry if it's a new
+            /* Otherwise commit the connection tracking entry if it's a new
              * connection that matches this ACL.  After this commit,
              * the reply traffic is allowed by a flow we create at
              * priority 65535, defined earlier.
@@ -5600,11 +5657,15 @@ build_acls(struct ovn_datapath *od, struct hmap *lflows,
          * Subsequent packets will hit the flow at priority 0 that just
          * uses "next;". */
         ovn_lflow_add(lflows, od, S_SWITCH_IN_ACL, 1,
-                      "ip && (!ct.est || (ct.est && ct_label.blocked == 1))",
-                       REGBIT_CONNTRACK_COMMIT" = 1; next;");
+                      REGBIT_SKIP_ACL_CT " == 0 "
+                      "&& ip "
+                      "&& (!ct.est || (ct.est && ct_label.blocked == 1))",
+                      REGBIT_CONNTRACK_COMMIT" = 1; next;");
         ovn_lflow_add(lflows, od, S_SWITCH_OUT_ACL, 1,
-                      "ip && (!ct.est || (ct.est && ct_label.blocked == 1))",
-                       REGBIT_CONNTRACK_COMMIT" = 1; next;");
+                      REGBIT_SKIP_ACL_CT " == 0 "
+                      "&& ip "
+                      "&& (!ct.est || (ct.est && ct_label.blocked == 1))",
+                      REGBIT_CONNTRACK_COMMIT" = 1; next;");
 
         /* Ingress and Egress ACL Table (Priority 65535).
          *
@@ -5614,10 +5675,14 @@ build_acls(struct ovn_datapath *od, struct hmap *lflows,
          *
          * This is enforced at a higher priority than ACLs can be defined. */
         ovn_lflow_add(lflows, od, S_SWITCH_IN_ACL, UINT16_MAX,
-                      "ct.inv || (ct.est && ct.rpl && ct_label.blocked == 1)",
+                      REGBIT_SKIP_ACL_CT " == 0 "
+                      "&& (ct.inv "
+                           "|| (ct.est && ct.rpl && ct_label.blocked == 1))",
                       "drop;");
         ovn_lflow_add(lflows, od, S_SWITCH_OUT_ACL, UINT16_MAX,
-                      "ct.inv || (ct.est && ct.rpl && ct_label.blocked == 1)",
+                      REGBIT_SKIP_ACL_CT " == 0 "
+                      "&& (ct.inv "
+                           "|| (ct.est && ct.rpl && ct_label.blocked == 1))",
                       "drop;");
 
         /* Ingress and Egress ACL Table (Priority 65535).
@@ -5630,11 +5695,13 @@ build_acls(struct ovn_datapath *od, struct hmap *lflows,
          *
          * This is enforced at a higher priority than ACLs can be defined. */
         ovn_lflow_add(lflows, od, S_SWITCH_IN_ACL, UINT16_MAX,
-                      "ct.est && !ct.rel && !ct.new && !ct.inv "
+                      REGBIT_SKIP_ACL_CT "== 0 "
+                      "&& ct.est && !ct.rel && !ct.new && !ct.inv "
                       "&& ct.rpl && ct_label.blocked == 0",
                       "next;");
         ovn_lflow_add(lflows, od, S_SWITCH_OUT_ACL, UINT16_MAX,
-                      "ct.est && !ct.rel && !ct.new && !ct.inv "
+                      REGBIT_SKIP_ACL_CT "== 0 "
+                      "&& ct.est && !ct.rel && !ct.new && !ct.inv "
                       "&& ct.rpl && ct_label.blocked == 0",
                       "next;");
 
@@ -5650,11 +5717,13 @@ build_acls(struct ovn_datapath *od, struct hmap *lflows,
          * related traffic such as an ICMP Port Unreachable through
          * that's generated from a non-listening UDP port.  */
         ovn_lflow_add(lflows, od, S_SWITCH_IN_ACL, UINT16_MAX,
-                      "!ct.est && ct.rel && !ct.new && !ct.inv "
+                      REGBIT_SKIP_ACL_CT "== 0 "
+                      "&& !ct.est && ct.rel && !ct.new && !ct.inv "
                       "&& ct_label.blocked == 0",
                       "next;");
         ovn_lflow_add(lflows, od, S_SWITCH_OUT_ACL, UINT16_MAX,
-                      "!ct.est && ct.rel && !ct.new && !ct.inv "
+                      REGBIT_SKIP_ACL_CT "== 0 "
+                      "&& !ct.est && ct.rel && !ct.new && !ct.inv "
                       "&& ct_label.blocked == 0",
                       "next;");
 
@@ -6709,7 +6778,7 @@ build_lswitch_flows(struct hmap *datapaths, struct hmap *ports,
             continue;
         }
 
-        build_pre_acls(od, lflows);
+        build_pre_acls(od, port_groups, lflows);
         build_pre_lb(od, lflows, meter_groups, lbs);
         build_pre_stateful(od, lflows);
         build_acl_hints(od, lflows);
diff --git a/ovn-nb.ovsschema b/ovn-nb.ovsschema
index 0c939b7..ef0121d 100644
--- a/ovn-nb.ovsschema
+++ b/ovn-nb.ovsschema
@@ -1,7 +1,7 @@
 {
     "name": "OVN_Northbound",
-    "version": "5.25.0",
-    "cksum": "1354137211 26116",
+    "version": "5.26.0",
+    "cksum": "1450952466 27225",
     "tables": {
         "NB_Global": {
             "columns": {
@@ -35,6 +35,12 @@
                                            "refType": "strong"},
                                    "min": 0,
                                    "max": "unlimited"}},
+                "stateless_filters": {
+                    "type": {"key": {"type": "uuid",
+                                     "refTable": "Stateless_Filter",
+                                     "refType": "strong"},
+                             "min": 0,
+                             "max": "unlimited"}},
                 "acls": {"type": {"key": {"type": "uuid",
                                           "refTable": "ACL",
                                           "refType": "strong"},
@@ -150,6 +156,12 @@
                                            "refType": "weak"},
                                    "min": 0,
                                    "max": "unlimited"}},
+                "stateless_filters": {
+                    "type": {"key": {"type": "uuid",
+                                     "refTable": "Stateless_Filter",
+                                     "refType": "strong"},
+                             "min": 0,
+                             "max": "unlimited"}},
                 "acls": {"type": {"key": {"type": "uuid",
                                           "refTable": "ACL",
                                           "refType": "strong"},
@@ -201,6 +213,16 @@
                     "type": {"key": "string", "value": "string",
                              "min": 0, "max": "unlimited"}}},
             "isRoot": false},
+        "Stateless_Filter": {
+            "columns": {
+                "priority": {"type": {"key": {"type": "integer",
+                                              "minInteger": 0,
+                                              "maxInteger": 32767}}},
+                "match": {"type": "string"},
+                "external_ids": {
+                    "type": {"key": "string", "value": "string",
+                             "min": 0, "max": "unlimited"}}},
+            "isRoot": false},
         "ACL": {
             "columns": {
                 "name": {"type": {"key": {"type": "string",
diff --git a/ovn-nb.xml b/ovn-nb.xml
index 1f2dbb9..81373ce 100644
--- a/ovn-nb.xml
+++ b/ovn-nb.xml
@@ -271,9 +271,16 @@
       ip addresses.
     </column>
 
-    <column name="acls">
-      Access control rules that apply to packets within the logical switch.
-    </column>
+    <group title="ACL processing">
+      <column name="acls">
+        Access control rules that apply to packets within the logical switch.
+      </column>
+
+      <column name="stateless_filters">
+        Stateless filters to bypass connection tracking that apply to packets
+        within the logical switch.
+      </column>
+    </group>
 
     <column name="qos_rules">
       QoS marking and metering rules that apply to packets within the
@@ -1430,6 +1437,11 @@
       lswitches that the ports of the port group belong to.
     </column>
 
+    <column name="stateless_filters">
+      Stateless filters to bypass connection tracking that apply to the
+      port_group.
+    </column>
+
     <group title="Common Columns">
       <column name="external_ids">
         See <em>External IDs</em> at the beginning of this document.
@@ -1589,6 +1601,44 @@
     </group>
   </table>
 
+  <table name="Stateless_Filter" title="Filters to bypass ACL processing">
+    <p>
+      Each row in this table represents a rule to determine if traffic should
+      be processed in a stateless way in the ACL stage, without recirculating
+      through connection tracking, regardless of the type of ACL that is hit.
+
+      In normal operation, whenever an ACL associated to a Logical_Switch
+      has action <code>allow-related</code>, all IP traffic is sent to
+      the connection tracker.
+
+      If <ref column="match"/> is set to <code>E</code> all ACLs that match
+      packets for which <code>E</code> is true are considered stateless and
+      will not generate recirculation of packets through connection tracking.
+
+      This also implies that the CMS should add an explicit <code>allow</code>
+      ACL for return traffic, because return traffic will not go to conntrack
+      either so it has to be explicitly allowed.
+
+      This is useful when some specific types of traffic do not need
+      stateful processing.
+    </p>
+    <column name="priority">
+      The priority of the filter rule.  Rules with numerically higher priority
+      take precedence.
+    </column>
+    <column name="match">
+      The packets that the stateless filter should match, in the same
+      expression language used for the <ref column="match" table="Logical_Flow"
+      db="OVN_Southbound"/> column in the OVN Southbound database's
+      <ref table="Logical_Flow" db="OVN_Southbound"/> table.
+    </column>
+    <group title="Common Columns">
+      <column name="external_ids">
+        See <em>External IDs</em> at the beginning of this document.
+      </column>
+    </group>
+  </table>
+
   <table name="ACL" title="Access Control List (ACL) rule">
     <p>
       Each row in this table represents one ACL rule for a logical switch
diff --git a/tests/ovn-nbctl.at b/tests/ovn-nbctl.at
index 619051d..b55ee03 100644
--- a/tests/ovn-nbctl.at
+++ b/tests/ovn-nbctl.at
@@ -270,6 +270,59 @@ AT_CHECK([ovn-nbctl --type=port-group acl-add ls0 to-lport 100 ip drop], [0], [i
 
 dnl ---------------------------------------------------------------------
 
+OVN_NBCTL_TEST([ovn_nbctl_stateless_filters], [Stateless_Filters], [
+ovn_nbctl_test_stateless_filters() {
+   AT_CHECK([ovn-nbctl $2 stateless-filter-add $1 300 udp])
+   AT_CHECK([ovn-nbctl $2 stateless-filter-add $1 200 tcp])
+   AT_CHECK([ovn-nbctl $2 stateless-filter-add $1 100 ip])
+   dnl Add duplicated Stateless_Filter
+   AT_CHECK([ovn-nbctl $2 stateless-filter-add $1 100 ip], [1], [], [stderr])
+   AT_CHECK([grep 'already existed' stderr], [0], [ignore])
+   AT_CHECK([ovn-nbctl $2 --may-exist stateless-filter-add $1 100 ip])
+
+   AT_CHECK([ovn-nbctl $2 stateless-filter-list $1], [0], [dnl
+  300 (udp)
+  200 (tcp)
+  100 (ip)
+])
+
+   dnl Delete all Stateless_Filters.
+   AT_CHECK([ovn-nbctl $2 stateless-filter-del $1])
+   AT_CHECK([ovn-nbctl $2 stateless-filter-list $1], [0], [dnl
+])
+
+   AT_CHECK([ovn-nbctl $2 stateless-filter-add $1 300 udp])
+   AT_CHECK([ovn-nbctl $2 stateless-filter-add $1 200 tcp])
+   AT_CHECK([ovn-nbctl $2 stateless-filter-add $1 100 ip])
+
+   dnl Delete a single filter.
+   AT_CHECK([ovn-nbctl $2 stateless-filter-del $1 200 tcp])
+   AT_CHECK([ovn-nbctl $2 stateless-filter-list $1], [0], [dnl
+  300 (udp)
+  100 (ip)
+])
+}
+
+AT_CHECK([ovn-nbctl ls-add ls0])
+ovn_nbctl_test_stateless_filters ls0
+AT_CHECK([ovn-nbctl ls-add ls1])
+ovn_nbctl_test_stateless_filters ls1 --type=switch
+AT_CHECK([ovn-nbctl create port_group name=pg0], [0], [ignore])
+ovn_nbctl_test_stateless_filters pg0 --type=port-group
+
+dnl Test when port group doesn't exist
+AT_CHECK([ovn-nbctl --type=port-group stateless-filter-add pg1 100 ip], [1], [], [dnl
+ovn-nbctl: pg1: port group name not found
+])
+
+dnl Test when same name exists in logical switches and portgroups
+AT_CHECK([ovn-nbctl create port_group name=ls0], [0], [ignore])
+AT_CHECK([ovn-nbctl stateless-filter-add ls0 100 ip], [1], [], [stderr])
+AT_CHECK([grep 'exists in both' stderr], [0], [ignore])
+AT_CHECK([ovn-nbctl --type=port-group stateless-filter-add ls0 100 ip], [0], [ignore])])
+
+dnl ---------------------------------------------------------------------
+
 OVN_NBCTL_TEST([ovn_nbctl_qos], [QoS], [
 AT_CHECK([ovn-nbctl ls-add ls0])
 AT_CHECK([ovn-nbctl qos-add ls0 from-lport 600 tcp dscp=63])
diff --git a/tests/ovn-northd.at b/tests/ovn-northd.at
index 87644bd..2fc7dc3 100644
--- a/tests/ovn-northd.at
+++ b/tests/ovn-northd.at
@@ -1781,3 +1781,266 @@ AT_CHECK([ovn-sbctl lflow-list | grep "ls_out_pre_lb.*priority=100" | grep reg0
 ])
 
 AT_CLEANUP
+
+AT_SETUP([ovn -- ACL Stateful Bypass - Logical_Switch])
+ovn_start
+
+ovn-nbctl ls-add ls
+ovn-nbctl lsp-add ls lsp1
+ovn-nbctl lsp-set-addresses lsp1 00:00:00:00:00:01
+ovn-nbctl lsp-add ls lsp2
+ovn-nbctl lsp-set-addresses lsp2 00:00:00:00:00:02
+
+ovn-nbctl acl-add ls from-lport 3 "tcp" allow
+ovn-nbctl acl-add ls from-lport 2 "udp" allow-related
+ovn-nbctl acl-add ls from-lport 1 "ip" drop
+ovn-nbctl --wait=sb sync
+
+flow_eth='eth.src == 00:00:00:00:00:01 && eth.dst == 00:00:00:00:00:02'
+flow_ip='ip.ttl==64 && ip4.src == 42.42.42.1 && ip4.dst == 66.66.66.66'
+flow_tcp='tcp && tcp.dst == 80'
+flow_udp='udp && udp.dst == 80'
+
+# TCP packets should go to conntrack.
+flow="inport == \"lsp1\" && ${flow_eth} && ${flow_ip} && ${flow_tcp}"
+AT_CHECK([ovn-trace --ct new --ct new --minimal ls "${flow}"], [0], [dnl
+# tcp,reg14=0x1,vlan_tci=0x0000,dl_src=00:00:00:00:00:01,dl_dst=00:00:00:00:00:02,nw_src=42.42.42.1,nw_dst=66.66.66.66,nw_tos=0,nw_ecn=0,nw_ttl=64,tp_src=0,tp_dst=80,tcp_flags=0
+ct_next(ct_state=new|trk) {
+    ct_next(ct_state=new|trk) {
+        output("lsp2");
+    };
+};
+])
+
+# UDP packets should go to conntrack.
+flow="inport == \"lsp1\" && ${flow_eth} && ${flow_ip} && ${flow_udp}"
+AT_CHECK([ovn-trace --ct new --ct new --minimal ls "${flow}"], [0], [dnl
+# udp,reg14=0x1,vlan_tci=0x0000,dl_src=00:00:00:00:00:01,dl_dst=00:00:00:00:00:02,nw_src=42.42.42.1,nw_dst=66.66.66.66,nw_tos=0,nw_ecn=0,nw_ttl=64,tp_src=0,tp_dst=80
+ct_next(ct_state=new|trk) {
+    ct_next(ct_state=new|trk) {
+        output("lsp2");
+    };
+};
+])
+
+# Enable Stateful Bypass for TCP.
+ovn-nbctl stateless-filter-add ls 1 tcp
+ovn-nbctl --wait=sb sync
+
+# TCP packets should not go to conntrack anymore.
+flow="inport == \"lsp1\" && ${flow_eth} && ${flow_ip} && ${flow_tcp}"
+AT_CHECK([ovn-trace --minimal ls "${flow}"], [0], [dnl
+# tcp,reg14=0x1,vlan_tci=0x0000,dl_src=00:00:00:00:00:01,dl_dst=00:00:00:00:00:02,nw_src=42.42.42.1,nw_dst=66.66.66.66,nw_tos=0,nw_ecn=0,nw_ttl=64,tp_src=0,tp_dst=80,tcp_flags=0
+output("lsp2");
+])
+
+# UDP packets still go to conntrack.
+flow="inport == \"lsp1\" && ${flow_eth} && ${flow_ip} && ${flow_udp}"
+AT_CHECK([ovn-trace --ct new --ct new --minimal ls "${flow}"], [0], [dnl
+# udp,reg14=0x1,vlan_tci=0x0000,dl_src=00:00:00:00:00:01,dl_dst=00:00:00:00:00:02,nw_src=42.42.42.1,nw_dst=66.66.66.66,nw_tos=0,nw_ecn=0,nw_ttl=64,tp_src=0,tp_dst=80
+ct_next(ct_state=new|trk) {
+    ct_next(ct_state=new|trk) {
+        output("lsp2");
+    };
+};
+])
+
+# Add a load balancer.
+ovn-nbctl lb-add lb-tcp 66.66.66.66:80 42.42.42.2:8080 tcp
+ovn-nbctl lb-add lb-udp 66.66.66.66:80 42.42.42.2:8080 udp
+ovn-nbctl ls-lb-add ls lb-tcp
+ovn-nbctl ls-lb-add ls lb-udp
+
+# Disable Stateful Bypass for TCP.
+ovn-nbctl stateless-filter-del ls
+ovn-nbctl --wait=sb sync
+
+# TCP packets should go to conntrack.
+flow="inport == \"lsp1\" && ${flow_eth} && ${flow_ip} && ${flow_tcp}"
+AT_CHECK([ovn-trace --ct new --ct new --minimal ls "${flow}"], [0], [dnl
+# tcp,reg14=0x1,vlan_tci=0x0000,dl_src=00:00:00:00:00:01,dl_dst=00:00:00:00:00:02,nw_src=42.42.42.1,nw_dst=66.66.66.66,nw_tos=0,nw_ecn=0,nw_ttl=64,tp_src=0,tp_dst=80,tcp_flags=0
+ct_next(ct_state=new|trk) {
+    ct_lb {
+        ct_next(ct_state=new|trk) {
+            output("lsp2");
+        };
+    };
+};
+])
+
+# UDP packets should go to conntrack.
+flow="inport == \"lsp1\" && ${flow_eth} && ${flow_ip} && ${flow_udp}"
+AT_CHECK([ovn-trace --ct new --ct new --minimal ls "${flow}"], [0], [dnl
+# udp,reg14=0x1,vlan_tci=0x0000,dl_src=00:00:00:00:00:01,dl_dst=00:00:00:00:00:02,nw_src=42.42.42.1,nw_dst=66.66.66.66,nw_tos=0,nw_ecn=0,nw_ttl=64,tp_src=0,tp_dst=80
+ct_next(ct_state=new|trk) {
+    ct_lb {
+        ct_next(ct_state=new|trk) {
+            output("lsp2");
+        };
+    };
+};
+])
+
+# Enable Stateful Bypass for TCP.
+ovn-nbctl stateless-filter-add ls 1 tcp
+ovn-nbctl --wait=sb sync
+
+# TCP packets should go to conntrack for load balancing.
+flow="inport == \"lsp1\" && ${flow_eth} && ${flow_ip} && ${flow_tcp}"
+AT_CHECK([ovn-trace --ct new --ct new --minimal ls "${flow}"], [0], [dnl
+# tcp,reg14=0x1,vlan_tci=0x0000,dl_src=00:00:00:00:00:01,dl_dst=00:00:00:00:00:02,nw_src=42.42.42.1,nw_dst=66.66.66.66,nw_tos=0,nw_ecn=0,nw_ttl=64,tp_src=0,tp_dst=80,tcp_flags=0
+ct_next(ct_state=new|trk) {
+    ct_lb {
+        ct_next(ct_state=new|trk) {
+            output("lsp2");
+        };
+    };
+};
+])
+
+# UDP packets still go to conntrack.
+flow="inport == \"lsp1\" && ${flow_eth} && ${flow_ip} && ${flow_udp}"
+AT_CHECK([ovn-trace --ct new --ct new --minimal ls "${flow}"], [0], [dnl
+# udp,reg14=0x1,vlan_tci=0x0000,dl_src=00:00:00:00:00:01,dl_dst=00:00:00:00:00:02,nw_src=42.42.42.1,nw_dst=66.66.66.66,nw_tos=0,nw_ecn=0,nw_ttl=64,tp_src=0,tp_dst=80
+ct_next(ct_state=new|trk) {
+    ct_lb {
+        ct_next(ct_state=new|trk) {
+            output("lsp2");
+        };
+    };
+};
+])
+
+AT_CLEANUP
+
+AT_SETUP([ovn -- ACL Stateful Bypass - Port_Group])
+ovn_start
+
+ovn-nbctl ls-add ls
+ovn-nbctl lsp-add ls lsp1
+ovn-nbctl lsp-set-addresses lsp1 00:00:00:00:00:01
+ovn-nbctl lsp-add ls lsp2
+ovn-nbctl lsp-set-addresses lsp2 00:00:00:00:00:02
+
+ovn-nbctl pg-add pg lsp1 lsp2
+ovn-nbctl acl-add pg from-lport 3 "tcp" allow
+ovn-nbctl acl-add pg from-lport 2 "udp" allow-related
+ovn-nbctl acl-add pg from-lport 1 "ip" drop
+ovn-nbctl --wait=sb sync
+
+flow_eth='eth.src == 00:00:00:00:00:01 && eth.dst == 00:00:00:00:00:02'
+flow_ip='ip.ttl==64 && ip4.src == 42.42.42.1 && ip4.dst == 66.66.66.66'
+flow_tcp='tcp && tcp.dst == 80'
+flow_udp='udp && udp.dst == 80'
+
+# TCP packets should go to conntrack.
+flow="inport == \"lsp1\" && ${flow_eth} && ${flow_ip} && ${flow_tcp}"
+AT_CHECK([ovn-trace --ct new --ct new --minimal ls "${flow}"], [0], [dnl
+# tcp,reg14=0x1,vlan_tci=0x0000,dl_src=00:00:00:00:00:01,dl_dst=00:00:00:00:00:02,nw_src=42.42.42.1,nw_dst=66.66.66.66,nw_tos=0,nw_ecn=0,nw_ttl=64,tp_src=0,tp_dst=80,tcp_flags=0
+ct_next(ct_state=new|trk) {
+    ct_next(ct_state=new|trk) {
+        output("lsp2");
+    };
+};
+])
+
+# UDP packets should go to conntrack.
+flow="inport == \"lsp1\" && ${flow_eth} && ${flow_ip} && ${flow_udp}"
+AT_CHECK([ovn-trace --ct new --ct new --minimal ls "${flow}"], [0], [dnl
+# udp,reg14=0x1,vlan_tci=0x0000,dl_src=00:00:00:00:00:01,dl_dst=00:00:00:00:00:02,nw_src=42.42.42.1,nw_dst=66.66.66.66,nw_tos=0,nw_ecn=0,nw_ttl=64,tp_src=0,tp_dst=80
+ct_next(ct_state=new|trk) {
+    ct_next(ct_state=new|trk) {
+        output("lsp2");
+    };
+};
+])
+
+# Enable Stateful Bypass for TCP.
+ovn-nbctl stateless-filter-add pg 1 tcp
+ovn-nbctl --wait=sb sync
+
+# TCP packets should not go to conntrack anymore.
+flow="inport == \"lsp1\" && ${flow_eth} && ${flow_ip} && ${flow_tcp}"
+AT_CHECK([ovn-trace --minimal ls "${flow}"], [0], [dnl
+# tcp,reg14=0x1,vlan_tci=0x0000,dl_src=00:00:00:00:00:01,dl_dst=00:00:00:00:00:02,nw_src=42.42.42.1,nw_dst=66.66.66.66,nw_tos=0,nw_ecn=0,nw_ttl=64,tp_src=0,tp_dst=80,tcp_flags=0
+output("lsp2");
+])
+
+# UDP packets still go to conntrack.
+flow="inport == \"lsp1\" && ${flow_eth} && ${flow_ip} && ${flow_udp}"
+AT_CHECK([ovn-trace --ct new --ct new --minimal ls "${flow}"], [0], [dnl
+# udp,reg14=0x1,vlan_tci=0x0000,dl_src=00:00:00:00:00:01,dl_dst=00:00:00:00:00:02,nw_src=42.42.42.1,nw_dst=66.66.66.66,nw_tos=0,nw_ecn=0,nw_ttl=64,tp_src=0,tp_dst=80
+ct_next(ct_state=new|trk) {
+    ct_next(ct_state=new|trk) {
+        output("lsp2");
+    };
+};
+])
+
+# Add a load balancer.
+ovn-nbctl lb-add lb-tcp 66.66.66.66:80 42.42.42.2:8080 tcp
+ovn-nbctl lb-add lb-udp 66.66.66.66:80 42.42.42.2:8080 udp
+ovn-nbctl ls-lb-add ls lb-tcp
+ovn-nbctl ls-lb-add ls lb-udp
+
+# Disable Stateful Bypass for TCP.
+ovn-nbctl stateless-filter-del pg
+ovn-nbctl --wait=sb sync
+
+# TCP packets should go to conntrack.
+flow="inport == \"lsp1\" && ${flow_eth} && ${flow_ip} && ${flow_tcp}"
+AT_CHECK([ovn-trace --ct new --ct new --minimal ls "${flow}"], [0], [dnl
+# tcp,reg14=0x1,vlan_tci=0x0000,dl_src=00:00:00:00:00:01,dl_dst=00:00:00:00:00:02,nw_src=42.42.42.1,nw_dst=66.66.66.66,nw_tos=0,nw_ecn=0,nw_ttl=64,tp_src=0,tp_dst=80,tcp_flags=0
+ct_next(ct_state=new|trk) {
+    ct_lb {
+        ct_next(ct_state=new|trk) {
+            output("lsp2");
+        };
+    };
+};
+])
+
+# UDP packets should go to conntrack.
+flow="inport == \"lsp1\" && ${flow_eth} && ${flow_ip} && ${flow_udp}"
+AT_CHECK([ovn-trace --ct new --ct new --minimal ls "${flow}"], [0], [dnl
+# udp,reg14=0x1,vlan_tci=0x0000,dl_src=00:00:00:00:00:01,dl_dst=00:00:00:00:00:02,nw_src=42.42.42.1,nw_dst=66.66.66.66,nw_tos=0,nw_ecn=0,nw_ttl=64,tp_src=0,tp_dst=80
+ct_next(ct_state=new|trk) {
+    ct_lb {
+        ct_next(ct_state=new|trk) {
+            output("lsp2");
+        };
+    };
+};
+])
+
+# Enable Stateful Bypass for TCP.
+ovn-nbctl stateless-filter-add pg 1 tcp
+ovn-nbctl --wait=sb sync
+
+# TCP packets should go to conntrack for load balancing.
+flow="inport == \"lsp1\" && ${flow_eth} && ${flow_ip} && ${flow_tcp}"
+AT_CHECK([ovn-trace --ct new --ct new --minimal ls "${flow}"], [0], [dnl
+# tcp,reg14=0x1,vlan_tci=0x0000,dl_src=00:00:00:00:00:01,dl_dst=00:00:00:00:00:02,nw_src=42.42.42.1,nw_dst=66.66.66.66,nw_tos=0,nw_ecn=0,nw_ttl=64,tp_src=0,tp_dst=80,tcp_flags=0
+ct_next(ct_state=new|trk) {
+    ct_lb {
+        ct_next(ct_state=new|trk) {
+            output("lsp2");
+        };
+    };
+};
+])
+
+# UDP packets still go to conntrack.
+flow="inport == \"lsp1\" && ${flow_eth} && ${flow_ip} && ${flow_udp}"
+AT_CHECK([ovn-trace --ct new --ct new --minimal ls "${flow}"], [0], [dnl
+# udp,reg14=0x1,vlan_tci=0x0000,dl_src=00:00:00:00:00:01,dl_dst=00:00:00:00:00:02,nw_src=42.42.42.1,nw_dst=66.66.66.66,nw_tos=0,nw_ecn=0,nw_ttl=64,tp_src=0,tp_dst=80
+ct_next(ct_state=new|trk) {
+    ct_lb {
+        ct_next(ct_state=new|trk) {
+            output("lsp2");
+        };
+    };
+};
+])
+
+AT_CLEANUP
diff --git a/tests/system-common-macros.at b/tests/system-common-macros.at
index c8fa6f0..65904ed 100644
--- a/tests/system-common-macros.at
+++ b/tests/system-common-macros.at
@@ -234,6 +234,14 @@ m4_define([FORMAT_PING], [grep "transmitted" | sed 's/time.*ms$/time 0ms/'])
 #
 m4_define([STRIP_MONITOR_CSUM], [grep "csum:" | sed 's/csum:.*/csum: <skip>/'])
 
+# FORMAT_CT_STATE([ip-addr])
+#
+# Strip content from the piped input which would differ from test to test
+# and limit the output to the rows containing 'ip-addr'. Don't strip state.
+#
+m4_define([FORMAT_CT_STATE],
+    [[grep "dst=$1" | sed -e 's/port=[0-9]*/port=<cleared>/g' -e 's/id=[0-9]*/id=<cleared>/g' | sort | uniq]])
+
 # FORMAT_CT([ip-addr])
 #
 # Strip content from the piped input which would differ from test to test
diff --git a/tests/system-ovn.at b/tests/system-ovn.at
index b9b5eaa..32f9acc 100644
--- a/tests/system-ovn.at
+++ b/tests/system-ovn.at
@@ -5397,3 +5397,116 @@ as
 OVS_TRAFFIC_VSWITCHD_STOP(["/.*error receiving.*/d
 /.*terminating with signal 15.*/d"])
 AT_CLEANUP
+
+AT_SETUP([ovn -- ACL Stateful Bypass + Load balancer])
+AT_SKIP_IF([test $HAVE_NC = no])
+AT_KEYWORDS([lb])
+AT_KEYWORDS([conntrack])
+ovn_start
+
+OVS_TRAFFIC_VSWITCHD_START()
+ADD_BR([br-int])
+
+# Set external-ids in br-int needed for ovn-controller
+ovs-vsctl \
+        -- set Open_vSwitch . external-ids:system-id=hv1 \
+        -- set Open_vSwitch . external-ids:ovn-remote=unix:$ovs_base/ovn-sb/ovn-sb.sock \
+        -- set Open_vSwitch . external-ids:ovn-encap-type=geneve \
+        -- set Open_vSwitch . external-ids:ovn-encap-ip=169.0.0.1 \
+        -- set bridge br-int fail-mode=secure other-config:disable-in-band=true
+
+# Start ovn-controller
+start_daemon ovn-controller
+
+# Logical network:
+# One logical switch with a load balancer with one backend.
+# On the LS we add "allow" ACLs for TCP and "allow-related" ACLs for UDP.
+# The "allow-related" ACL normally forces all traffic to go to conntrack.
+# We enable ACL stateful bypass for TCP so TCP traffic should not be
+# sent to conntrack for ACLs (only for LB).
+
+ovn-nbctl ls-add ls
+ovn-nbctl lsp-add ls lsp1
+ovn-nbctl lsp-set-addresses lsp1 00:00:00:00:00:01
+ovn-nbctl lsp-add ls lsp2
+ovn-nbctl lsp-set-addresses lsp2 00:00:00:00:00:02
+
+ovn-nbctl acl-add ls from-lport 3 "tcp" allow
+ovn-nbctl acl-add ls from-lport 2 "udp" allow-related
+ovn-nbctl acl-add ls from-lport 1 "ip" drop
+
+ovn-nbctl lr-add rtr
+ovn-nbctl lrp-add rtr rtr-ls 00:00:00:00:01:00 42.42.42.254/24
+ovn-nbctl lsp-add ls ls-rtr                       \
+    -- lsp-set-type ls-rtr router                 \
+    -- lsp-set-addresses ls-rtr 00:00:00:00:01:00 \
+    -- lsp-set-options ls-rtr router-port=rtr-ls
+
+# Add a load balancer.
+ovn-nbctl lb-add lb-tcp 66.66.66.66:80 42.42.42.2:8080 tcp
+ovn-nbctl lb-add lb-udp 66.66.66.66:80 42.42.42.2:8080 udp
+ovn-nbctl ls-lb-add ls lb-tcp
+ovn-nbctl ls-lb-add ls lb-udp
+
+# Enable Stateful Bypass for TCP.
+ovn-nbctl \
+    --id=@f1 create Stateless_Filter priority=1 match="tcp" -- \
+    set Logical_Switch ls stateless_filters='@f1'
+
+ADD_NAMESPACES(lsp1)
+ADD_VETH(lsp1, lsp1, br-int, "42.42.42.1/24", "00:00:00:00:00:01", \
+         "42.42.42.254")
+
+ADD_NAMESPACES(lsp2)
+ADD_VETH(lsp2, lsp2, br-int, "42.42.42.2/24", "00:00:00:00:00:02", \
+         "42.42.42.254")
+
+ovn-nbctl --wait=hv sync
+
+# Start a UDP server on lsp2.
+NETNS_DAEMONIZE([lsp2], [nc -l --no-shutdown -u 42.42.42.2 8080], [nc2.pid])
+
+# Start a UDP connection.
+NS_CHECK_EXEC([lsp1], [echo "foo" | nc --no-shutdown -u 66.66.66.66 80])
+
+# There should be 2 UDP conntrack entries:
+# - one for the allow-related ACL.
+# - one for the LB dnat.
+OVS_WAIT_UNTIL([test "$(ovs-appctl dpctl/dump-conntrack | grep udp | grep '42.42.42.1' -c)" = "2"])
+
+AT_CHECK([ovs-appctl dpctl/dump-conntrack | FORMAT_CT_STATE(42.42.42.1) | grep udp | \
+sed -e 's/zone=[[0-9]]*/zone=<cleared>/'], [0], [dnl
+udp,orig=(src=42.42.42.1,dst=42.42.42.2,sport=<cleared>,dport=<cleared>),reply=(src=42.42.42.2,dst=42.42.42.1,sport=<cleared>,dport=<cleared>),zone=<cleared>
+udp,orig=(src=42.42.42.1,dst=66.66.66.66,sport=<cleared>,dport=<cleared>),reply=(src=42.42.42.2,dst=42.42.42.1,sport=<cleared>,dport=<cleared>),zone=<cleared>,labels=0x2
+])
+
+# Start a TCP server on lsp2.
+NETNS_DAEMONIZE([lsp2], [nc -l --no-shutdown 42.42.42.2 8080], [nc0.pid])
+
+# Start a TCP connection.
+NETNS_DAEMONIZE([lsp1], [nc --no-shutdown 66.66.66.66 80], [nc1.pid])
+
+OVS_WAIT_UNTIL([test "$(ovs-appctl dpctl/dump-conntrack | grep tcp | grep '42.42.42.1' -c)" = "1"])
+
+# There should be only one TCP conntrack entry, for the LB dnat.
+AT_CHECK([ovs-appctl dpctl/dump-conntrack | FORMAT_CT_STATE(42.42.42.1) | grep tcp | \
+sed -e 's/zone=[[0-9]]*/zone=<cleared>/'], [0], [dnl
+tcp,orig=(src=42.42.42.1,dst=66.66.66.66,sport=<cleared>,dport=<cleared>),reply=(src=42.42.42.2,dst=42.42.42.1,sport=<cleared>,dport=<cleared>),zone=<cleared>,labels=0x2,protoinfo=(state=ESTABLISHED)
+])
+
+OVS_APP_EXIT_AND_WAIT([ovn-controller])
+
+as ovn-sb
+OVS_APP_EXIT_AND_WAIT([ovsdb-server])
+
+as ovn-nb
+OVS_APP_EXIT_AND_WAIT([ovsdb-server])
+
+as northd
+OVS_APP_EXIT_AND_WAIT([ovn-northd])
+
+as
+OVS_TRAFFIC_VSWITCHD_STOP(["/failed to query port patch-.*/d
+/connection dropped.*/d"])
+
+AT_CLEANUP
diff --git a/utilities/ovn-detrace.in b/utilities/ovn-detrace.in
index 4f8dd5f..343965d 100755
--- a/utilities/ovn-detrace.in
+++ b/utilities/ovn-detrace.in
@@ -232,6 +232,17 @@ class StaticRouteHintHandler(CookieHandlerByUUUID):
                     route.ip_prefix, route.nexthop, route.output_port,
                     route.policy))
 
+class StatelessFilterHintHandler(CookieHandlerByUUUID):
+    def __init__(self, ovnnb_db):
+        super(StatelessFilterHintHandler, self).__init__(ovnnb_db,
+                                                         'Stateless_Filter')
+
+    def print_record(self, s_filter):
+        output = 'Stateless_Filter: priority=%s, match=(%s)' % (
+            s_filter.priority,
+            s_filter.match.strip('"'))
+        print_h(output)
+
 class QoSHintHandler(CookieHandlerByUUUID):
     def __init__(self, ovnnb_db):
         super(QoSHintHandler, self).__init__(ovnnb_db, 'QoS')
@@ -254,6 +265,7 @@ class LogicalFlowHandler(CookieHandlerByUUUID):
             LoadBalancerHintHandler(ovnnb_db),
             NATHintHandler(ovnnb_db),
             StaticRouteHintHandler(ovnnb_db),
+            StatelessFilterHintHandler(ovnnb_db),
             QoSHintHandler(ovnnb_db),
         ]
 
diff --git a/utilities/ovn-nbctl.c b/utilities/ovn-nbctl.c
index d7bb4b4..7716dcd 100644
--- a/utilities/ovn-nbctl.c
+++ b/utilities/ovn-nbctl.c
@@ -601,6 +601,17 @@ ACL commands:\n\
   acl-list {SWITCH | PORTGROUP}\n\
                             print ACLs for SWITCH\n\
 \n\
+Stateless filter commands:\n\
+  [--type={switch | port-group}] [--may-exist]\n\
+  stateless-filter-add {SWITCH | PORTGROUP} PRIORITY MATCH \n\
+                            add a stateless filter to SWITCH/PORTGROUP\n\
+  [--type={switch | port-group}]\n\
+  stateless-filter-del {SWITCH | PORTGROUP} [PRIORITY MATCH]\n\
+                            remove stateless filters from SWITCH/PORTGROUP\n\
+  [--type={switch | port-group}]\n\
+  stateless-filter-list {SWITCH | PORTGROUP}\n\
+                            print stateless filters for SWITCH\n\
+\n\
 QoS commands:\n\
   qos-add SWITCH DIRECTION PRIORITY MATCH [rate=RATE [burst=BURST]] [dscp=DSCP]\n\
                             add an QoS rule to SWITCH\n\
@@ -725,7 +736,8 @@ LB commands:\n\
   ls-lb-add SWITCH LB       add a load-balancer to SWITCH\n\
   ls-lb-del SWITCH [LB]     remove load-balancers from SWITCH\n\
   ls-lb-list SWITCH         print load-balancers\n\
-\n\
+\n\n",program_name, program_name);
+    printf("\
 DHCP Options commands:\n\
   dhcp-options-create CIDR [EXTERNAL_IDS]\n\
                            create a DHCP options row with CIDR\n\
@@ -743,8 +755,7 @@ Connection commands:\n\
   del-connection             delete the connections\n\
   [--inactivity-probe=MSECS]\n\
   set-connection TARGET...   set the list of connections to TARGET...\n\
-\n\n",program_name, program_name);
-    printf("\
+\n\
 SSL commands:\n\
   get-ssl                     print the SSL configuration\n\
   del-ssl                     delete the SSL configuration\n\
@@ -2021,9 +2032,9 @@ acl_cmp(const void *acl1_, const void *acl2_)
 }
 
 static char * OVS_WARN_UNUSED_RESULT
-acl_cmd_get_pg_or_ls(struct ctl_context *ctx,
-                     const struct nbrec_logical_switch **ls,
-                     const struct nbrec_port_group **pg)
+cmd_get_pg_or_ls(struct ctl_context *ctx,
+                 const struct nbrec_logical_switch **ls,
+                 const struct nbrec_port_group **pg)
 {
     const char *opt_type = shash_find_data(&ctx->options, "--type");
     char *error;
@@ -2073,7 +2084,7 @@ nbctl_acl_list(struct ctl_context *ctx)
     const struct nbrec_acl **acls;
     size_t i;
 
-    char *error = acl_cmd_get_pg_or_ls(ctx, &ls, &pg);
+    char *error = cmd_get_pg_or_ls(ctx, &ls, &pg);
     if (error) {
         ctx->error = error;
         return;
@@ -2173,7 +2184,7 @@ nbctl_acl_add(struct ctl_context *ctx)
     const struct nbrec_port_group *pg = NULL;
     const char *action = ctx->argv[5];
 
-    char *error = acl_cmd_get_pg_or_ls(ctx, &ls, &pg);
+    char *error = cmd_get_pg_or_ls(ctx, &ls, &pg);
     if (error) {
         ctx->error = error;
         return;
@@ -2264,7 +2275,7 @@ nbctl_acl_del(struct ctl_context *ctx)
     const struct nbrec_logical_switch *ls = NULL;
     const struct nbrec_port_group *pg = NULL;
 
-    char *error = acl_cmd_get_pg_or_ls(ctx, &ls, &pg);
+    char *error = cmd_get_pg_or_ls(ctx, &ls, &pg);
     if (error) {
         ctx->error = error;
         return;
@@ -2351,6 +2362,181 @@ nbctl_acl_del(struct ctl_context *ctx)
     }
 }
 
+static int
+stateless_filter_cmp(const void *filter1_, const void *filter2_)
+{
+    const struct nbrec_stateless_filter *const *filter1p = filter1_;
+    const struct nbrec_stateless_filter *const *filter2p = filter2_;
+    const struct nbrec_stateless_filter *filter1 = *filter1p;
+    const struct nbrec_stateless_filter *filter2 = *filter2p;
+
+    if (filter1->priority != filter2->priority) {
+        return filter1->priority > filter2->priority ? -1 : 1;
+    } else {
+        return strcmp(filter1->match, filter2->match);
+    }
+}
+
+static void
+nbctl_stateless_filter_list(struct ctl_context *ctx)
+{
+    const struct nbrec_logical_switch *ls = NULL;
+    const struct nbrec_port_group *pg = NULL;
+    const struct nbrec_stateless_filter **filters;
+    size_t i;
+
+    char *error = cmd_get_pg_or_ls(ctx, &ls, &pg);
+    if (error) {
+        ctx->error = error;
+        return;
+    }
+
+    size_t n_filters = pg ? pg->n_stateless_filters : ls->n_stateless_filters;
+    struct nbrec_stateless_filter **nb_filters = pg
+                                                 ? pg->stateless_filters
+                                                 : ls->stateless_filters;
+
+    filters = xmalloc(sizeof *filters * n_filters);
+    for (i = 0; i < n_filters; i++) {
+        filters[i] = nb_filters[i];
+    }
+
+    qsort(filters, n_filters, sizeof *filters, stateless_filter_cmp);
+
+    for (i = 0; i < n_filters; i++) {
+        const struct nbrec_stateless_filter *filter = filters[i];
+        ds_put_format(&ctx->output, "%5"PRId64" (%s)\n",
+                      filter->priority, filter->match);
+    }
+
+    free(filters);
+}
+
+static void
+nbctl_stateless_filter_add(struct ctl_context *ctx)
+{
+    const struct nbrec_logical_switch *ls = NULL;
+    const struct nbrec_port_group *pg = NULL;
+
+    char *error = cmd_get_pg_or_ls(ctx, &ls, &pg);
+    if (error) {
+        ctx->error = error;
+        return;
+    }
+
+    int64_t priority;
+    error = parse_priority(ctx->argv[2], &priority);
+    if (error) {
+        ctx->error = error;
+        return;
+    }
+
+    /* Create the filter. */
+    struct nbrec_stateless_filter *filter =
+        nbrec_stateless_filter_insert(ctx->txn);
+    nbrec_stateless_filter_set_priority(filter, priority);
+    nbrec_stateless_filter_set_match(filter, ctx->argv[3]);
+
+    /* Check if same filter already exists for the ls/portgroup */
+    size_t n_filters = pg ? pg->n_stateless_filters : ls->n_stateless_filters;
+    struct nbrec_stateless_filter **filters = pg
+                                              ? pg->stateless_filters
+                                              : ls->stateless_filters;
+    for (size_t i = 0; i < n_filters; i++) {
+        if (!stateless_filter_cmp(&filters[i], &filter)) {
+            bool may_exist = shash_find(&ctx->options, "--may-exist") != NULL;
+            if (!may_exist) {
+                ctl_error(ctx,
+                          "Same filter already existed on ls or pg %s.",
+                          ctx->argv[1]);
+                return;
+            }
+            return;
+        }
+    }
+
+    /* Insert the filter into the logical switch/port group. */
+    struct nbrec_stateless_filter **new_filters =
+        xmalloc(sizeof *new_filters * (n_filters + 1));
+    nullable_memcpy(new_filters, filters, sizeof *new_filters * n_filters);
+    new_filters[n_filters] = filter;
+    if (pg) {
+        nbrec_port_group_verify_stateless_filters(pg);
+        nbrec_port_group_set_stateless_filters(pg, new_filters,
+                                               n_filters + 1);
+    } else {
+        nbrec_logical_switch_verify_stateless_filters(ls);
+        nbrec_logical_switch_set_stateless_filters(ls, new_filters,
+                                                   n_filters + 1);
+    }
+    free(new_filters);
+}
+
+static void
+nbctl_stateless_filter_del(struct ctl_context *ctx)
+{
+    const struct nbrec_logical_switch *ls = NULL;
+    const struct nbrec_port_group *pg = NULL;
+
+    char *error = cmd_get_pg_or_ls(ctx, &ls, &pg);
+    if (error) {
+        ctx->error = error;
+        return;
+    }
+
+    if (ctx->argc == 2) {
+        /* If priority and match are not specified, delete filters. */
+        if (pg) {
+            nbrec_port_group_verify_stateless_filters(pg);
+            nbrec_port_group_set_stateless_filters(pg, NULL, 0);
+        } else {
+            nbrec_logical_switch_verify_stateless_filters(ls);
+            nbrec_logical_switch_set_stateless_filters(ls, NULL, 0);
+        }
+        return;
+    }
+
+    int64_t priority;
+    error = parse_priority(ctx->argv[2], &priority);
+    if (error) {
+        ctx->error = error;
+        return;
+    }
+
+    if (ctx->argc == 3) {
+        ctl_error(ctx, "cannot specify priority without match");
+        return;
+    }
+
+    size_t n_filters = pg ? pg->n_stateless_filters : ls->n_stateless_filters;
+    struct nbrec_stateless_filter **filters = pg
+                                              ? pg->stateless_filters
+                                              : ls->stateless_filters;
+
+    /* Remove the matching rule. */
+    for (size_t i = 0; i < n_filters; i++) {
+        struct nbrec_stateless_filter *filter = filters[i];
+
+        if (priority == filter->priority
+            && !strcmp(ctx->argv[3], filter->match)) {
+            struct nbrec_stateless_filter **new_filters
+                = xmemdup(filters, sizeof *new_filters * n_filters);
+            new_filters[i] = filters[n_filters - 1];
+            if (pg) {
+                nbrec_port_group_verify_stateless_filters(pg);
+                nbrec_port_group_set_stateless_filters(pg, new_filters,
+                                                       n_filters - 1);
+            } else {
+                nbrec_logical_switch_verify_stateless_filters(ls);
+                nbrec_logical_switch_set_stateless_filters(ls, new_filters,
+                                                           n_filters - 1);
+            }
+            free(new_filters);
+            return;
+        }
+    }
+}
+
 static void
 nbctl_qos_list(struct ctl_context *ctx)
 {
@@ -6283,6 +6469,15 @@ static const struct ctl_command_syntax nbctl_commands[] = {
     { "acl-list", 1, 1, "{SWITCH | PORTGROUP}",
       NULL, nbctl_acl_list, NULL, "--type=", RO },
 
+    /* stateless filter commands. */
+    { "stateless-filter-add", 3, 4, "{SWITCH | PORTGROUP} PRIORITY MATCH",
+      NULL, nbctl_stateless_filter_add, NULL,
+      "--may-exist,--type=", RW },
+    { "stateless-filter-del", 1, 4, "{SWITCH | PORTGROUP} [PRIORITY MATCH]",
+      NULL, nbctl_stateless_filter_del, NULL, "--type=", RW },
+    { "stateless-filter-list", 1, 1, "{SWITCH | PORTGROUP}",
+      NULL, nbctl_stateless_filter_list, NULL, "--type=", RO },
+
     /* qos commands. */
     { "qos-add", 5, 7,
       "SWITCH DIRECTION PRIORITY MATCH [rate=RATE [burst=BURST]] [dscp=DSCP]",




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