From f482ce2cbc0e76f1048927077021945ba0e1c216 Mon Sep 17 00:00:00 2001
From: Russell Bryant <russell@ovn.org>
Date: Mon, 9 Dec 2019 10:56:03 -0500
Subject: [PATCH ovn 3/4] northd: Load config before processing nbdb contents
Reorder ovnnb_db_run() such that configuration parameters are loaded
or initialized before processing the nbdb contents.
I found this bug because I noticed dynamic MAC addresses being
assigned at ovn-northd startup with an empty prefix. Later, it would
switch to allocating MAC addresses with the random prefix that was
generated.
The impact of this bug is particularly bad if ovn-northd restarts in
an existing environment. ovn-northd will check previously assigned
dynamic addresses for validity. At startup, previously assigned MAC
addresses will all appear invalid because they have a non-empty
prefix, so it will reset them all. In the case of IPv6, this also
causes the IPv6 addresses change, since OVN assigned dynamic IPv6
addresses are based on the MAC address.
With ovn-kubernetes, whatever first set of addresses were assigned is
what ends up cached on the Node object and used by the Pod. This bug
can cause all of this to get out of sync, breaking network
connectivity for Pods on an OVN virtual network.
Signed-off-by: Russell Bryant <russell@ovn.org>
Acked-by: Numan Siddique <numans@ovn.org>
(cherry picked from upstream commit b441bf3a7211461552242d50e6b0c41e68d4799d)
---
ovn/northd/ovn-northd.c | 78 ++++++++++++++++++++++++-------------------------
1 file changed, 39 insertions(+), 39 deletions(-)
diff --git a/ovn/northd/ovn-northd.c b/ovn/northd/ovn-northd.c
index 40835a0..af67f63 100644
--- a/ovn/northd/ovn-northd.c
+++ b/ovn/northd/ovn-northd.c
@@ -10145,45 +10145,6 @@ ovnnb_db_run(struct northd_context *ctx,
struct shash meter_groups = SHASH_INITIALIZER(&meter_groups);
struct hmap lbs;
- build_datapaths(ctx, datapaths, lr_list);
- build_ports(ctx, sbrec_chassis_by_name, datapaths, ports);
- build_ovn_lbs(ctx, ports, &lbs);
- build_ipam(datapaths, ports);
- build_port_group_lswitches(ctx, &port_groups, ports);
- build_lrouter_groups(ports, lr_list);
- build_ip_mcast(ctx, datapaths);
- build_mcast_groups(ctx, datapaths, ports, &mcast_groups, &igmp_groups);
- build_meter_groups(ctx, &meter_groups);
- build_lflows(ctx, datapaths, ports, &port_groups, &mcast_groups,
- &igmp_groups, &meter_groups, &lbs);
-
- sync_address_sets(ctx);
- sync_port_groups(ctx);
- sync_meters(ctx);
- sync_dns_entries(ctx, datapaths);
- destroy_ovn_lbs(&lbs);
- hmap_destroy(&lbs);
-
- struct ovn_igmp_group *igmp_group, *next_igmp_group;
-
- HMAP_FOR_EACH_SAFE (igmp_group, next_igmp_group, hmap_node, &igmp_groups) {
- ovn_igmp_group_destroy(&igmp_groups, igmp_group);
- }
-
- struct ovn_port_group *pg, *next_pg;
- HMAP_FOR_EACH_SAFE (pg, next_pg, key_node, &port_groups) {
- ovn_port_group_destroy(&port_groups, pg);
- }
- hmap_destroy(&igmp_groups);
- hmap_destroy(&mcast_groups);
- hmap_destroy(&port_groups);
-
- struct shash_node *node, *next;
- SHASH_FOR_EACH_SAFE (node, next, &meter_groups) {
- shash_delete(&meter_groups, node);
- }
- shash_destroy(&meter_groups);
-
/* Sync ipsec configuration.
* Copy nb_cfg from northbound to southbound database.
* Also set up to update sb_cfg once our southbound transaction commits. */
@@ -10257,6 +10218,45 @@ ovnnb_db_run(struct northd_context *ctx,
controller_event_en = smap_get_bool(&nb->options,
"controller_event", false);
+ build_datapaths(ctx, datapaths, lr_list);
+ build_ports(ctx, sbrec_chassis_by_name, datapaths, ports);
+ build_ovn_lbs(ctx, ports, &lbs);
+ build_ipam(datapaths, ports);
+ build_port_group_lswitches(ctx, &port_groups, ports);
+ build_lrouter_groups(ports, lr_list);
+ build_ip_mcast(ctx, datapaths);
+ build_mcast_groups(ctx, datapaths, ports, &mcast_groups, &igmp_groups);
+ build_meter_groups(ctx, &meter_groups);
+ build_lflows(ctx, datapaths, ports, &port_groups, &mcast_groups,
+ &igmp_groups, &meter_groups, &lbs);
+
+ sync_address_sets(ctx);
+ sync_port_groups(ctx);
+ sync_meters(ctx);
+ sync_dns_entries(ctx, datapaths);
+ destroy_ovn_lbs(&lbs);
+ hmap_destroy(&lbs);
+
+ struct ovn_igmp_group *igmp_group, *next_igmp_group;
+
+ HMAP_FOR_EACH_SAFE (igmp_group, next_igmp_group, hmap_node, &igmp_groups) {
+ ovn_igmp_group_destroy(&igmp_groups, igmp_group);
+ }
+
+ struct ovn_port_group *pg, *next_pg;
+ HMAP_FOR_EACH_SAFE (pg, next_pg, key_node, &port_groups) {
+ ovn_port_group_destroy(&port_groups, pg);
+ }
+ hmap_destroy(&igmp_groups);
+ hmap_destroy(&mcast_groups);
+ hmap_destroy(&port_groups);
+
+ struct shash_node *node, *next;
+ SHASH_FOR_EACH_SAFE (node, next, &meter_groups) {
+ shash_delete(&meter_groups, node);
+ }
+ shash_destroy(&meter_groups);
+
cleanup_macam(&macam);
}
--
1.8.3.1