[ovs-dev] [PATCH ovn v7 05/14] ovn-northd: move DNS lookup-response to a function

anton.ivanov at cambridgegreys.com anton.ivanov at cambridgegreys.com
Wed Nov 25 11:02:07 UTC 2020


From: Anton Ivanov <anton.ivanov at cambridgegreys.com>

Signed-off-by: Anton Ivanov <anton.ivanov at cambridgegreys.com>
---
 northd/ovn-northd.c | 53 +++++++++++++++++++++++++--------------------
 1 file changed, 29 insertions(+), 24 deletions(-)

diff --git a/northd/ovn-northd.c b/northd/ovn-northd.c
index 6bfdf9c9a..aee94569e 100644
--- a/northd/ovn-northd.c
+++ b/northd/ovn-northd.c
@@ -6695,30 +6695,6 @@ build_lswitch_flows(struct hmap *datapaths, struct hmap *ports,
     struct ovn_datapath *od;
     struct ovn_port *op;
 
-    /* Logical switch ingress table 17 and 18: DNS lookup and response
-     * priority 100 flows.
-     */
-    HMAP_FOR_EACH (od, key_node, datapaths) {
-        if (!od->nbs || !ls_has_dns_records(od->nbs)) {
-           continue;
-        }
-
-        ovn_lflow_add(lflows, od, S_SWITCH_IN_DNS_LOOKUP, 100,
-                      "udp.dst == 53",
-                      REGBIT_DNS_LOOKUP_RESULT" = dns_lookup(); next;");
-        const char *dns_action = "eth.dst <-> eth.src; ip4.src <-> ip4.dst; "
-                      "udp.dst = udp.src; udp.src = 53; outport = inport; "
-                      "flags.loopback = 1; output;";
-        const char *dns_match = "udp.dst == 53 && "REGBIT_DNS_LOOKUP_RESULT;
-        ovn_lflow_add(lflows, od, S_SWITCH_IN_DNS_RESPONSE, 100,
-                      dns_match, dns_action);
-        dns_action = "eth.dst <-> eth.src; ip6.src <-> ip6.dst; "
-                      "udp.dst = udp.src; udp.src = 53; outport = inport; "
-                      "flags.loopback = 1; output;";
-        ovn_lflow_add(lflows, od, S_SWITCH_IN_DNS_RESPONSE, 100,
-                      dns_match, dns_action);
-    }
-
     /* Ingress table 14 and 15: DHCP options and response, by default goto
      * next. (priority 0).
      * Ingress table 16 and 17: DNS lookup and response, by default goto next.
@@ -7394,6 +7370,34 @@ build_lswitch_dhcp_options_and_response(struct ovn_port *op,
     }
 }
 
+/* Logical switch ingress table 17 and 18: DNS lookup and response
+ * priority 100 flows.
+ */
+static void
+build_lswitch_dns_lookup_response(struct ovn_datapath *od,
+                                  struct hmap *lflows)
+{
+    if (!od->nbs || !ls_has_dns_records(od->nbs)) {
+       return;
+    }
+
+    ovn_lflow_add(lflows, od, S_SWITCH_IN_DNS_LOOKUP, 100,
+                  "udp.dst == 53",
+                  REGBIT_DNS_LOOKUP_RESULT" = dns_lookup(); next;");
+    const char *dns_action = "eth.dst <-> eth.src; ip4.src <-> ip4.dst; "
+                  "udp.dst = udp.src; udp.src = 53; outport = inport; "
+                  "flags.loopback = 1; output;";
+    const char *dns_match = "udp.dst == 53 && "REGBIT_DNS_LOOKUP_RESULT;
+    ovn_lflow_add(lflows, od, S_SWITCH_IN_DNS_RESPONSE, 100,
+                  dns_match, dns_action);
+    dns_action = "eth.dst <-> eth.src; ip6.src <-> ip6.dst; "
+                  "udp.dst = udp.src; udp.src = 53; outport = inport; "
+                  "flags.loopback = 1; output;";
+    ovn_lflow_add(lflows, od, S_SWITCH_IN_DNS_RESPONSE, 100,
+                  dns_match, dns_action);
+}
+
+
 
 
 /* Returns a string of the IP address of the router port 'op' that
@@ -11127,6 +11131,7 @@ build_lswitch_and_lrouter_iterate_by_od(struct ovn_datapath *od,
     build_lswitch_lflows_admission_control(od, lsi->lflows);
     build_lswitch_input_port_sec_od(od, lsi->lflows);
     build_lswitch_arp_nd_responder_od(od, lsi->lflows);
+    build_lswitch_dns_lookup_response(od, lsi->lflows);
 
     /* Build Logical Router Flows. */
     build_adm_ctrl_flows_for_lrouter(od, lsi->lflows);
-- 
2.20.1



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