mpls: implement state change callbacks

There was already a basic type defined, but nothing more.
This implements callbacks similar to
ip4_enable_disable_interface_callback_t.

Type: feature
Change-Id: I34fcb146ca68af4eb8cdd244529eb149f884284d
Signed-off-by: Adrian Pistol <vifino@posteo.net>

2 files changed, 37 insertions, 5 deletions

diff --git a/src/vnet/mpls/interface.c b/src/vnet/mpls/interface.c
index 5e80b9d0532..fd654dca891 100644
--- a/src/vnet/mpls/interface.c
+++ b/src/vnet/mpls/interface.c
@@ -22,6 +22,14 @@
 #include <vnet/adj/adj_midchain.h>
 #include <vnet/dpo/classify_dpo.h>
 
+typedef struct
+{
+  mpls_interface_state_change_function_t *function;
+  uword function_opaque;
+} mpls_interface_state_change_callback_t;
+
+/** Functions to call when interface becomes MPLS enabled/disabled. */
+static mpls_interface_state_change_callback_t *state_change_callbacks;
 
 u8
 mpls_sw_interface_is_enabled (u32 sw_if_index)
@@ -34,6 +42,17 @@ mpls_sw_interface_is_enabled (u32 sw_if_index)
     return (mm->mpls_enabled_by_sw_if_index[sw_if_index]);
 }
 
+void
+mpls_interface_state_change_add_callback (
+  mpls_interface_state_change_function_t *function, uword opaque)
+{
+  mpls_interface_state_change_callback_t cb = {
+    .function = function,
+    .function_opaque = opaque,
+  };
+  vec_add1 (state_change_callbacks, cb);
+}
+
 int
 mpls_sw_interface_enable_disable (mpls_main_t *mm, u32 sw_if_index,
 				  u8 is_enable)
@@ -81,6 +100,12 @@ mpls_sw_interface_enable_disable (mpls_main_t *mm, u32 sw_if_index,
   else if (hi->l3_if_count)
     hi->l3_if_count--;
 
+  {
+    mpls_interface_state_change_callback_t *cb;
+    vec_foreach (cb, state_change_callbacks)
+      cb->function (mm, cb->function_opaque, sw_if_index, is_enable);
+  }
+
   return (0);
 }
 
diff --git a/src/vnet/mpls/mpls.h b/src/vnet/mpls/mpls.h
index 885901f89a4..6baaaad95ba 100644
--- a/src/vnet/mpls/mpls.h
+++ b/src/vnet/mpls/mpls.h
@@ -23,14 +23,18 @@
 #include <vnet/fib/fib_node.h>
 #include <vnet/adj/adj.h>
 
+struct mpls_main_t;
+
 /**
  * @brief Definition of a callback for receiving MPLS interface state change
  * notifications
  */
-typedef void (*mpls_interface_state_change_callback_t) (u32 sw_if_index,
-							u32 is_enable);
+typedef void (mpls_interface_state_change_function_t) (struct mpls_main_t *mm,
+						       uword opaque,
+						       u32 sw_if_index,
+						       u32 is_enable);
 
-typedef struct
+typedef struct mpls_main_t
 {
   /* MPLS FIB index for each software interface */
   u32 *fib_index_by_sw_if_index;
@@ -77,11 +81,14 @@ unformat_function_t unformat_mpls_unicast_label;
 unformat_function_t unformat_mpls_header;
 unformat_function_t unformat_pg_mpls_header;
 
+u8 mpls_sw_interface_is_enabled (u32 sw_if_index);
+
+void mpls_interface_state_change_add_callback (
+  mpls_interface_state_change_function_t *function, uword opaque);
+
 int mpls_sw_interface_enable_disable (mpls_main_t *mm, u32 sw_if_index,
 				      u8 is_enable);
 
-u8 mpls_sw_interface_is_enabled (u32 sw_if_index);
-
 int mpls_dest_cmp (void *a1, void *a2);
 
 int mpls_fib_index_cmp (void *a1, void *a2);