From 0a5755145c1cae11f87626545818e81ed7d2efa7 Mon Sep 17 00:00:00 2001
From: Simon Goldschmidt <goldsimon@gmx.de>
Date: Wed, 24 Aug 2011 22:00:10 +0200
Subject: [PATCH] added netif remove callback (bug #32397)

---
 CHANGELOG                |  5 ++++-
 src/core/netif.c         | 18 ++++++++++++++++++
 src/include/lwip/netif.h |  7 +++++++
 src/include/lwip/opt.h   |  8 ++++++++
 4 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG b/CHANGELOG
index 34fb7ac8..7cad2831 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -6,7 +6,10 @@ HISTORY
 
  ++ New features:
 
-  2011-08-26: Simon Goldschmidt
+  2011-08-24: Simon Goldschmidt
+  * opt.h, netif.h/.c: added netif remove callback (bug #32397)
+
+  2011-07-26: Simon Goldschmidt
   * etharp.c: ETHARP_SUPPORT_VLAN: add support for an external VLAN filter
     function instead of only checking for one VLAN (define ETHARP_VLAN_CHECK_FN)
 
diff --git a/src/core/netif.c b/src/core/netif.c
index 6da84234..c882eade 100644
--- a/src/core/netif.c
+++ b/src/core/netif.c
@@ -306,6 +306,11 @@ netif_remove(struct netif *netif)
     /* reset default netif */
     netif_set_default(NULL);
   }
+#if LWIP_NETIF_REMOVE_CALLBACK
+  if (netif->remove_callback) {
+    netif->remove_callback(netif);
+  }
+#endif /* LWIP_NETIF_REMOVE_CALLBACK */
   LWIP_DEBUGF( NETIF_DEBUG, ("netif_remove: removed netif\n") );
 }
 
@@ -550,6 +555,19 @@ void netif_set_status_callback(struct netif *netif, netif_status_callback_fn sta
 }
 #endif /* LWIP_NETIF_STATUS_CALLBACK */
 
+#if LWIP_NETIF_REMOVE_CALLBACK
+/**
+ * Set callback to be called when the interface has been removed
+ */
+void
+netif_set_remove_callback(struct netif *netif, netif_status_callback_fn remove_callback)
+{
+  if (netif) {
+    netif->remove_callback = remove_callback;
+  }
+}
+#endif /* LWIP_NETIF_REMOVE_CALLBACK */
+
 /**
  * Called by a driver when its link goes up
  */
diff --git a/src/include/lwip/netif.h b/src/include/lwip/netif.h
index c14289b8..a658e51b 100644
--- a/src/include/lwip/netif.h
+++ b/src/include/lwip/netif.h
@@ -197,6 +197,10 @@ struct netif {
    */
   netif_status_callback_fn link_callback;
 #endif /* LWIP_NETIF_LINK_CALLBACK */
+#if LWIP_NETIF_REMOVE_CALLBACK
+  /** This function is called when the netif has been removed */
+  netif_status_callback_fn remove_callback;
+#endif /* LWIP_NETIF_REMOVE_CALLBACK */
   /** This field can be set by the device driver and could point
    *  to state information for the device. */
   void *state;
@@ -331,6 +335,9 @@ void netif_set_down(struct netif *netif);
 #if LWIP_NETIF_STATUS_CALLBACK
 void netif_set_status_callback(struct netif *netif, netif_status_callback_fn status_callback);
 #endif /* LWIP_NETIF_STATUS_CALLBACK */
+#if LWIP_NETIF_REMOVE_CALLBACK
+void netif_set_remove_callback(struct netif *netif, netif_status_callback_fn remove_callback);
+#endif /* LWIP_NETIF_REMOVE_CALLBACK */
 
 void netif_set_link_up(struct netif *netif);
 void netif_set_link_down(struct netif *netif);
diff --git a/src/include/lwip/opt.h b/src/include/lwip/opt.h
index 8ae6ba4d..a345a149 100644
--- a/src/include/lwip/opt.h
+++ b/src/include/lwip/opt.h
@@ -1115,6 +1115,14 @@
 #define LWIP_NETIF_LINK_CALLBACK        0
 #endif
 
+/**
+ * LWIP_NETIF_REMOVE_CALLBACK==1: Support a callback function that is called
+ * when a netif has been removed
+ */
+#ifndef LWIP_NETIF_REMOVE_CALLBACK
+#define LWIP_NETIF_REMOVE_CALLBACK      0
+#endif
+
 /**
  * LWIP_NETIF_HWADDRHINT==1: Cache link-layer-address hints (e.g. table
  * indices) in struct netif. TCP and UDP can make use of this to prevent