From 50bd1d3e256154212198a31932896b07af5b129f Mon Sep 17 00:00:00 2001
From: Neale Ranns <neale@graphiant.com>
Date: Fri, 8 Oct 2021 07:16:12 +0000
Subject: fib: re-evaluate the import/export state of a prefix.

Type: fix

re-evaluate the import/export state of a prefix when the interface it is attached to rebinds to a different table.
Only attached routes have import/export requirements, so we can back walk from the glean adjacency when the interface rebinds tables.
There are two cases to consider.
 1. the rebind may change the prefix from/to import
 2. the import VRF may change

Signed-off-by: Neale Ranns <neale@graphiant.com>
Change-Id: I25b6af43b3b2d8f701dfbe7a08710dc56b3f5778
---
 src/vnet/adj/adj_glean.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 59 insertions(+), 1 deletion(-)

(limited to 'src/vnet/adj')

diff --git a/src/vnet/adj/adj_glean.c b/src/vnet/adj/adj_glean.c
index e8ca043662f..45477649c1a 100644
--- a/src/vnet/adj/adj_glean.c
+++ b/src/vnet/adj/adj_glean.c
@@ -424,11 +424,59 @@ VNET_SW_INTERFACE_ADD_DEL_FUNCTION(adj_glean_interface_delete);
  */
 static void
 adj_glean_ethernet_change_mac (ethernet_main_t * em,
-                             u32 sw_if_index, uword opaque)
+                               u32 sw_if_index,
+                               uword opaque)
 {
     adj_glean_walk (sw_if_index, adj_glean_update_rewrite_walk, NULL);
 }
 
+static void
+adj_glean_table_bind (fib_protocol_t fproto,
+                      u32 sw_if_index,
+                      u32 itf_fib_index)
+{
+    /*
+     * for each glean on the interface trigger a walk back to the children
+     */
+    fib_node_back_walk_ctx_t bw_ctx = {
+        .fnbw_reason =  FIB_NODE_BW_REASON_FLAG_INTERFACE_BIND,
+        .interface_bind = {
+            .fnbw_to_fib_index = itf_fib_index,
+        },
+    };
+
+    adj_glean_walk (sw_if_index, adj_glean_start_backwalk, &bw_ctx);
+}
+
+
+/**
+ * Callback function invoked when an interface's IPv6 Table
+ * binding changes
+ */
+static void
+adj_glean_ip6_table_bind (ip6_main_t * im,
+                          uword opaque,
+                          u32 sw_if_index,
+                          u32 new_fib_index,
+                          u32 old_fib_index)
+{
+  adj_glean_table_bind (FIB_PROTOCOL_IP6, sw_if_index, new_fib_index);
+}
+
+/**
+ * Callback function invoked when an interface's IPv4 Table
+ * binding changes
+ */
+static void
+adj_glean_ip4_table_bind (ip4_main_t * im,
+                          uword opaque,
+                          u32 sw_if_index,
+                          u32 new_fib_index,
+                          u32 old_fib_index)
+{
+  adj_glean_table_bind (FIB_PROTOCOL_IP4, sw_if_index, new_fib_index);
+}
+
 u8*
 format_adj_glean (u8* s, va_list *ap)
 {
@@ -519,4 +567,14 @@ adj_glean_module_init (void)
         .function_opaque = 0,
     };
     vec_add1 (ethernet_main.address_change_callbacks, ctx);
+
+    ip6_table_bind_callback_t cbt6 = {
+        .function = adj_glean_ip6_table_bind,
+    };
+    vec_add1 (ip6_main.table_bind_callbacks, cbt6);
+
+    ip4_table_bind_callback_t cbt4 = {
+        .function = adj_glean_ip4_table_bind,
+    };
+    vec_add1 (ip4_main.table_bind_callbacks, cbt4);
 }
-- 
cgit 1.2.3-korg