interface/local: add remove_interface function

Babeld can add interfaces dynamically. However, babeld is missing a
function to remove interfaces and stop meshing on them. Add a function
that can do it.

Signed-off-by: Nick Hainke <vincent@systemli.org>

Author: PolynomialDivision

interface.c

@@ -96,6 +96,33 @@ add_interface(char *ifname, struct interface_conf *if_conf)
     return ifp;
 }
 
+void
+remove_interface(char *ifname)
+{
+    struct interface *ifp = NULL;
+
+    if(interfaces == NULL)
+        return;
+
+    if(strcmp(interfaces->name, ifname) == 0) {
+        interfaces = interfaces->next;
+        return;
+    }
+
+    FOR_ALL_INTERFACES(ifp) {
+        if(ifp->next == NULL)
+            break;
+        if(strcmp(ifp->next->name, ifname) == 0) {
+            break;
+        }
+    }
+
+    if(ifp->next == NULL)
+        return;
+
+    interfaces = ifp->next;
+}
+
 int
 flush_interface(char *ifname)
 {

interface.h

@@ -163,6 +163,7 @@ if_up(struct interface *ifp)
 }
 
 struct interface *add_interface(char *ifname, struct interface_conf *if_conf);
+void remove_interface(char *ifname);
 int flush_interface(char *ifname);
 unsigned jitter(struct buffered *buf, int urgent);
 unsigned update_jitter(struct interface *ifp, int urgent);

local.h

@@ -27,6 +27,7 @@ struct xroute;
 #define LOCAL_FLUSH 0
 #define LOCAL_ADD 1
 #define LOCAL_CHANGE 2
+#define LOCAL_REMOVE 3
 
 #ifndef MAX_LOCAL_SOCKETS
 #define MAX_LOCAL_SOCKETS 4