Added router id to install filter

The router id allows to assign origin-based pref-src.

A use case is, when installing default routes originated by two edge routers with different subnets, and the client has 2 ips matching the separate subnets

install ip 0.0.0.0/0                  eq 0    id 00:02:00:00:00:00:1d:01      pref-src 66.199.5.163
install ip 0.0.0.0/0                  eq 0    id 00:02:00:00:00:00:1d:00      pref-src 12.144.66.186

Author: Dando-Real-ITA

configuration.c

@@ -1503,13 +1503,14 @@ redistribute_filter(const unsigned char *prefix, unsigned short plen,
 }
 
 int
-install_filter(const unsigned char *prefix, unsigned short plen,
+install_filter(const unsigned char *id,
+               const unsigned char *prefix, unsigned short plen,
                const unsigned char *src_prefix, unsigned short src_plen,
                unsigned int ifindex,
                struct filter_result *result)
 {
     int res;
-    res = do_filter(install_filters, NULL, prefix, plen,
+    res = do_filter(install_filters, id, prefix, plen,
                     src_prefix, src_plen, NULL, ifindex, 0, result);
     if(res < 0)
         res = INFINITY;

configuration.h

@@ -84,7 +84,8 @@ int redistribute_filter(const unsigned char *prefix, unsigned short plen,
                     const unsigned char *src_prefix, unsigned short src_plen,
                     unsigned int ifindex, int proto,
                     struct filter_result *result);
-int install_filter(const unsigned char *prefix, unsigned short plen,
+int install_filter(const unsigned char *id,
+                   const unsigned char *prefix, unsigned short plen,
                    const unsigned char *src_prefix, unsigned short src_plen,
                    unsigned int ifindex, struct filter_result *result);
 int finalise_config(void);

route.c

@@ -447,7 +447,8 @@ change_route(int operation, const struct babel_route *route, int metric,
     unsigned int ifindex = route->neigh->ifp->ifindex;
     int m, table;
 
-    m = install_filter(route->src->prefix, route->src->plen,
+    m = install_filter(route->src->id,
+                       route->src->prefix, route->src->plen,
                        route->src->src_prefix, route->src->src_plen,
                        ifindex, &filter_result);
     if(m >= INFINITY && operation == ROUTE_ADD) {