cnat: add input feature node

This allows to configure nat on a per-interface basis. Special care must
be taken to ensure the configuration remains consistent.

Type: feature

Change-Id: I352b2dce182e09d30813ce958333bb1ff37d9b4e
Signed-off-by: Aloys Augustin <aloaugus@cisco.com>
Signed-off-by: Nathan Skrzypczak <nathan.skrzypczak@gmail.com>

1 files changed, 53 insertions, 0 deletions

diff --git a/src/plugins/cnat/cnat_snat.c b/src/plugins/cnat/cnat_snat.c
index 68b2f2b11bf..b063715d585 100644
--- a/src/plugins/cnat/cnat_snat.c
+++ b/src/plugins/cnat/cnat_snat.c
@@ -17,6 +17,59 @@
 #include <cnat/cnat_snat.h>
 #include <cnat/cnat_translation.h>
 
+cnat_snat_policy_main_t cnat_snat_policy_main;
+
+void
+cnat_set_snat_policy (cnat_snat_policy_t fp)
+{
+  cnat_snat_policy_main.snat_policy = fp;
+}
+
+static clib_error_t *
+cnat_snat_policy_cmd (vlib_main_t *vm, unformat_input_t *input,
+		      vlib_cli_command_t *cmd)
+{
+  cnat_snat_policy_t fp = NULL;
+
+  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat (input, "none"))
+	;
+      else
+	return clib_error_return (0, "unknown input '%U'",
+				  format_unformat_error, input);
+    }
+
+  cnat_set_snat_policy (fp);
+  return NULL;
+}
+
+VLIB_CLI_COMMAND (cnat_snat_policy_command, static) = {
+  .path = "cnat set snat policy",
+  .short_help = "cnat set snat policy {none,k8s}",
+  .function = cnat_snat_policy_cmd,
+};
+
+static clib_error_t *
+show_cnat_snat_policy_cmd (vlib_main_t *vm, unformat_input_t *input,
+			   vlib_cli_command_t *cmd)
+{
+  u8 *s = format (NULL, "snat policy: ");
+  if (cnat_snat_policy_main.snat_policy == NULL)
+    s = format (s, "none");
+  else
+    s = format (s, "unknown (%x)", cnat_snat_policy_main.snat_policy);
+
+  vlib_cli_output (vm, (char *) s);
+  return NULL;
+}
+
+VLIB_CLI_COMMAND (show_cnat_snat_policy_command, static) = {
+  .path = "show cnat snat policy",
+  .short_help = "show cnat snat policy",
+  .function = show_cnat_snat_policy_cmd,
+};
+
 static void
 cnat_compute_prefix_lengths_in_search_order (cnat_snat_pfx_table_t *
 					     table, ip_address_family_t af)