all: rework configuring route table support by adding "route-table" setting

We added "ipv4.route-table-sync" and "ipv6.route-table-sync" to not change
behavior for users that configured policy routing outside of NetworkManager,
for example, via a dispatcher script. Users had to explicitly opt-in
for NetworkManager to fully manage all routing tables.

These settings were awkward. Replace them with new settings "ipv4.route-table"
and "ipv6.route-table". Note that this commit breaks API/ABI on the unstable
development branch by removing recently added API.

As before, a connection will have no route-table set by default. This
has the meaning that policy-routing is not enabled and only the main table
will be fully synced. Once the user sets a table, we recognize that and
NetworkManager manages all routing tables.

The new route-table setting has other important uses: analog to
"ipv4.route-metric", it is the default that applies to all routes.
Currently it only works for static routes, not DHCP, SLAAC,
default-route, etc. That will be implemented later.

For static routes, each route still can explicitly set a table, and
overwrite the per-connection setting in "ipv4.route-table" and
"ipv6.route-table".

1 files changed, 17 insertions, 0 deletions

diff --git a/src/nm-types.h b/src/nm-types.h
index bd5e249baa..af99bdcfad 100644
--- a/src/nm-types.h
+++ b/src/nm-types.h
@@ -197,6 +197,23 @@ typedef enum {
 	NM_IP_CONFIG_MERGE_NO_DNS                   = (1LL << 1),
 } NMIPConfigMergeFlags;
 
+
+/**
+ * NMIPRouteTableSyncMode:
+ * @NM_IP_ROUTE_TABLE_SYNC_MODE_MAIN: only the main table is synced. For all
+ *   other tables, NM won't delete any extra routes.
+ * @NM_IP_ROUTE_TABLE_SYNC_MODE_FULL: NM will sync all tables, except the
+ *   local table (255).
+ * @NM_IP_ROUTE_TABLE_SYNC_MODE_ALL: NM will sync all tables, including the
+ *   local table (255).
+ */
+typedef enum {
+	NM_IP_ROUTE_TABLE_SYNC_MODE_MAIN        = 1,
+	NM_IP_ROUTE_TABLE_SYNC_MODE_FULL        = 2,
+	NM_IP_ROUTE_TABLE_SYNC_MODE_ALL         = 3,
+} NMIPRouteTableSyncMode;
+
+
 /* settings */
 typedef struct _NMAgentManager       NMAgentManager;
 typedef struct _NMSecretAgent        NMSecretAgent;