acl-plugin: improvements in 'show acl-plugin macip acl' CLI

- allow to optionally specify the specific MACIP ACL index:
  'show acl-plugin macip acl [index N]'
- after showing the MACIP ACL, show the sw_if_index of
  interface(s) where it is applied.

Also, add some executions of this debug commands
to the MACIP test case for easy verification.

Change-Id: I56cf8272abc20b1b2581b60d528d27a70d186b18
Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>

2 files changed, 47 insertions, 11 deletions

diff --git a/src/plugins/acl/acl.c b/src/plugins/acl/acl.c
index c1c27c12c2f..57940fcccd7 100644
--- a/src/plugins/acl/acl.c
+++ b/src/plugins/acl/acl.c
@@ -2163,8 +2163,12 @@ macip_acl_add_list (u32 count, vl_api_macip_acl_rule_t rules[],
   return rv;
 }
 
-
-/* No check for validity of sw_if_index - the callers were supposed to validate */
+/* No check that sw_if_index denotes a valid interface - the callers
+ * were supposed to validate.
+ *
+ * That said, if sw_if_index corresponds to an interface that exists at all,
+ * this function must return errors accordingly if the ACL is not applied.
+ */
 
 static int
 macip_acl_interface_del_acl (acl_main_t * am, u32 sw_if_index)
@@ -2172,13 +2176,16 @@ macip_acl_interface_del_acl (acl_main_t * am, u32 sw_if_index)
   int rv;
   u32 macip_acl_index;
   macip_acl_list_t *a;
-  void *oldheap = acl_set_heap (am);
-  vec_validate_init_empty (am->macip_acl_by_sw_if_index, sw_if_index, ~0);
-  clib_mem_set_heap (oldheap);
+
+  /* The vector is too short - MACIP ACL is not applied */
+  if (sw_if_index >= vec_len (am->macip_acl_by_sw_if_index))
+    return VNET_API_ERROR_NO_SUCH_ENTRY;
+
   macip_acl_index = am->macip_acl_by_sw_if_index[sw_if_index];
   /* No point in deleting MACIP ACL which is not applied */
   if (~0 == macip_acl_index)
     return VNET_API_ERROR_NO_SUCH_ENTRY;
+
   a = pool_elt_at_index (am->macip_acls, macip_acl_index);
   /* remove the classifier tables off the interface L2 ACL */
   rv =
@@ -2190,6 +2197,11 @@ macip_acl_interface_del_acl (acl_main_t * am, u32 sw_if_index)
 			       a->out_l2_table_index, 0);
   /* Unset the MACIP ACL index */
   am->macip_acl_by_sw_if_index[sw_if_index] = ~0;
+  /* macip_acl_interface_add_acl did a vec_add1() to this previously, so [sw_if_index] should be valid */
+  u32 index = vec_search (am->sw_if_index_vec_by_macip_acl[macip_acl_index],
+			  sw_if_index);
+  if (index != ~0)
+    vec_del1 (am->sw_if_index_vec_by_macip_acl[macip_acl_index], index);
   return rv;
 }
 
@@ -2208,6 +2220,8 @@ macip_acl_interface_add_acl (acl_main_t * am, u32 sw_if_index,
   void *oldheap = acl_set_heap (am);
   a = pool_elt_at_index (am->macip_acls, macip_acl_index);
   vec_validate_init_empty (am->macip_acl_by_sw_if_index, sw_if_index, ~0);
+  vec_validate (am->sw_if_index_vec_by_macip_acl, macip_acl_index);
+  vec_add1 (am->sw_if_index_vec_by_macip_acl[macip_acl_index], sw_if_index);
   clib_mem_set_heap (oldheap);
   /* If there already a MACIP ACL applied, unapply it */
   if (~0 != am->macip_acl_by_sw_if_index[sw_if_index])
@@ -3352,10 +3366,6 @@ macip_acl_print (acl_main_t * am, u32 macip_acl_index)
   vlib_main_t *vm = am->vlib_main;
   int i;
 
-  /* Don't attempt to show the ACLs that do not exist */
-  if (pool_is_free_index (am->macip_acls, macip_acl_index))
-    return;
-
   /* Don't try to print someone else's memory */
   if (macip_acl_index > vec_len (am->macip_acls))
     return;
@@ -3389,8 +3399,31 @@ acl_show_aclplugin_macip_acl_fn (vlib_main_t * vm,
   clib_error_t *error = 0;
   acl_main_t *am = &acl_main;
   int i;
+  u32 acl_index = ~0;
+
+  (void) unformat (input, "index %u", &acl_index);
+
   for (i = 0; i < vec_len (am->macip_acls); i++)
-    macip_acl_print (am, i);
+    {
+      /* Don't attempt to show the ACLs that do not exist */
+      if (pool_is_free_index (am->macip_acls, i))
+	continue;
+
+      if ((acl_index != ~0) && (acl_index != i))
+	{
+	  continue;
+	}
+
+      macip_acl_print (am, i);
+      if (i < vec_len (am->sw_if_index_vec_by_macip_acl))
+	{
+	  vlib_cli_output (vm, "  applied on sw_if_index(s): %U\n",
+			   format_vec32,
+			   vec_elt (am->sw_if_index_vec_by_macip_acl, i),
+			   "%d");
+	}
+    }
+
   return error;
 }
 
@@ -3915,7 +3948,7 @@ VLIB_CLI_COMMAND (aclplugin_show_tables_command, static) = {
 
 VLIB_CLI_COMMAND (aclplugin_show_macip_acl_command, static) = {
     .path = "show acl-plugin macip acl",
-    .short_help = "show acl-plugin macip acl",
+    .short_help = "show acl-plugin macip acl [index N]",
     .function = acl_show_aclplugin_macip_acl_fn,
 };
 
diff --git a/src/plugins/acl/acl.h b/src/plugins/acl/acl.h
index d7ccbe96e6b..789a0759804 100644
--- a/src/plugins/acl/acl.h
+++ b/src/plugins/acl/acl.h
@@ -220,6 +220,9 @@ typedef struct {
   /* MACIP (input) ACLs associated with the interfaces */
   u32 *macip_acl_by_sw_if_index;
 
+  /* Vector of interfaces on which given MACIP ACLs are applied */
+  u32 **sw_if_index_vec_by_macip_acl;
+
   /* bitmaps when set the processing is enabled on the interface */
   uword *fa_in_acl_on_sw_if_index;
   uword *fa_out_acl_on_sw_if_index;