Implement handling of ifindex change in filters.

filter.c

@@ -221,6 +221,7 @@ parse_filter(gnc_t gnc, void *closure)
             c = getword(c, &interface, gnc, closure);
             if(c < -1)
                 goto error;
+            filter->ifname = strdup(interface);
             filter->ifindex = if_nametoindex(interface);
         } else if(strcmp(token, "allow") == 0) {
             filter->result = 0;
@@ -360,6 +361,24 @@ parse_config_from_string(char *string)
     return parse_config((gnc_t)gnc_string, &s);
 }
 
+static void
+renumber_filter(struct filter *filter)
+{
+    while(filter) {
+        if(filter->ifname)
+            filter->ifindex = if_nametoindex(filter->ifname);
+        filter = filter->next;
+    }
+}
+
+void
+renumber_filters()
+{
+    renumber_filter(input_filters);
+    renumber_filter(output_filters);
+    renumber_filter(redistribute_filters);
+}
+
 static int
 filter_match(struct filter *f, const unsigned char *id,
              const unsigned char *prefix, unsigned short plen,

filter.h

@@ -24,6 +24,7 @@ THE SOFTWARE.
 
 struct filter {
     int af;
+    char *ifname;
     unsigned int ifindex;
     unsigned char *id;
     unsigned char *prefix;
@@ -37,6 +38,7 @@ struct filter {
 
 int parse_config_from_file(char *filename);
 int parse_config_from_string(char *string);
+void renumber_filters(void);
 
 int input_filter(const unsigned char *id,
                  const unsigned char *prefix, unsigned short plen,