[HICN-395] Static face/route maintainance though face manager

Change-Id: I8f2287a262412bacc50f3c89756ec9fd6ce30d33
Signed-off-by: Jordan Augé <jordan.auge+fdio@cisco.com>

3 files changed, 381 insertions, 68 deletions

diff --git a/ctrl/facemgr/src/api.c b/ctrl/facemgr/src/api.c
index 23ca2f2ae..d27811476 100644
--- a/ctrl/facemgr/src/api.c
+++ b/ctrl/facemgr/src/api.c
@@ -160,6 +160,8 @@ struct facemgr_s {
     interface_t * updown;
 #endif
     int timer_fd; /* Timer used for reattempts */
+
+    int cur_static_id; /* Used to distinguish static faces (pre-incremented) */
 };
 
 int
@@ -198,6 +200,7 @@ facemgr_initialize(facemgr_t * facemgr)
     }
 
     facemgr->timer_fd = 0;
+    facemgr->cur_static_id = 0;
 
     return 0;
 
@@ -533,6 +536,9 @@ int
 facelet_cache_lookup(const facelet_set_t * facelet_cache, facelet_t * facelet,
         facelet_t ***cached_facelets)
 {
+    assert(facelet);
+    if (!facelet_has_family(facelet))
+        return 0;
 #if 0 // key is no more sufficient now that we support multiple faces per interface
     /*
      * If the facelet is uniquely identified by its key, it is used to perform
@@ -565,6 +571,11 @@ facelet_cache_lookup(const facelet_set_t * facelet_cache, facelet_t * facelet,
 
     int num_match = 0;
     for (unsigned i = 0; i < n; i++) {
+#if 0
+        char facelet_s[MAXSZ_FACELET];
+        facelet_snprintf(facelet_s, MAXSZ_FACELET, facelet_array[i]);
+        printf("cache entry #%d/%di = %s\n", i+1, n, facelet_s);
+#endif
         if (!facelet_match(facelet_array[i], facelet)) {
             continue;
         }
@@ -679,6 +690,7 @@ facemgr_complement_facelet_au(facemgr_t * facemgr, facelet_t * facelet)
         return -2;
 
     netdevice_t netdevice = NETDEVICE_EMPTY;
+
     int rc = facelet_get_netdevice(facelet, &netdevice);
     if (rc < 0) {
         ERROR("[facemgr_complement_facelet_bj] Error retrieving netdevice from facelet");
@@ -1080,6 +1092,8 @@ facemgr_process_facelet(facemgr_t * facemgr, facelet_t * facelet)
             facelet_unset_local_port(facelet);
             facelet_unset_remote_addr(facelet);
             facelet_unset_remote_port(facelet);
+            facelet_unset_admin_state(facelet);
+            facelet_unset_state(facelet);
             facelet_unset_bj_done(facelet);
 #ifdef WITH_ANDROID_UTILITY
             facelet_unset_au_done(facelet);
@@ -1227,6 +1241,82 @@ facemgr_process_facelet_create(facemgr_t * facemgr, facelet_t * facelet)
     return 0;
 }
 
+/*
+ * \return 0 in case of success and no static facelet was added, 1 if a static
+ * facelet was added, and -1 in case of error.
+ */
+int
+facemgr_consider_static_facelet(facemgr_t * facemgr, facelet_t * facelet)
+{
+    /*
+     * We need to analyze the facelet and eventually:
+     *  - add it in our static list
+     *  - replicate it on multipath interfaces
+     */
+    netdevice_type_t netdevice_type;
+    if (facelet_get_netdevice_type(facelet, &netdevice_type) < 0)
+        return -1;
+
+    if ((netdevice_type == NETDEVICE_TYPE_UNDEFINED) ||
+            (netdevice_type == NETDEVICE_TYPE_LOOPBACK))
+        return 0;
+
+    if ((facelet_get_route_array(facelet, NULL) == 0))
+        return 0;
+
+    /*
+     * How to differenciate facelet created by face manager from user
+     * created ones ? This cannot be a flag in the facelet as it needs
+     * to work across restarts of the face manager...
+     * Also we might have two default routes.
+     *
+     * TODO:
+     * - The static one should not be a duplicate of the one we would
+     * create by default....
+     * - This should anyways be detected...
+     *
+     * One solution would be to install the default ones as static but
+     * this requires to implement a priority scheme between some of the
+     * static routes so that the override mechanism continues to work as
+     * usual.
+     *
+     * Current, we recognize the routes created by default by the face
+     * maanger thanks to the routing prefixes (a single default route).
+     */
+
+    facelet_t * static_facelet = facelet_dup(facelet);
+    facelet_unset_netdevice(static_facelet);
+    facelet_unset_netdevice_type(static_facelet);
+    facelet_unset_local_addr(static_facelet);
+    facelet_unset_local_port(static_facelet);
+
+    facelet_t * facelet_found = NULL;
+    if (facelet_array_get(facemgr->static_facelets, static_facelet, &facelet_found) < 0) {
+        ERROR("[facemgr_consider_static_facelet] Error checking whether static facelet already exists or not");
+        return -1;
+    }
+
+    /* Skip addition if facelet exists */
+    if (facelet_found)
+        return 0;
+
+    if (facelet_array_add(facemgr->static_facelets, static_facelet) < 0) {
+        ERROR("[facemgr_consider_static_facelet] Could not add facelet to static array");
+        facelet_free(static_facelet);
+        return -1;
+    }
+
+    char facelet_s[MAXSZ_FACELET];
+    int rc = facelet_snprintf(facelet_s, MAXSZ_FACELET, static_facelet);
+    if (rc >= MAXSZ_FACELET)
+        ERROR("[facemgr_consider_static_facelet] Unexpected truncation of facelet string");
+    if (rc < 0)
+        ERROR("[facemgr_consider_static_facelet] Error during facelet string output");
+    DEBUG("[facemgr_consider_static_facelet] Successfully added facelet to static array %s", facelet_s);
+
+    return 1;
+}
+
 /**
  * \brief Process facelet GET event
  * \param [in] facemgr - Pointer to the face manager instance
@@ -1237,16 +1327,34 @@ facemgr_process_facelet_create(facemgr_t * facemgr, facelet_t * facelet)
 int
 facemgr_process_facelet_get(facemgr_t * facemgr, facelet_t * facelet)
 {
-    if (facelet_has_netdevice(facelet)) {
-        netdevice_t netdevice;
-        if (facelet_get_netdevice(facelet, &netdevice) < 0)
-            return -1;
-        if (!IS_VALID_NETDEVICE(netdevice))
-            return -2;
-        facelet_set_status(facelet, FACELET_STATUS_CLEAN);
-        return facelet_set_add(facemgr->facelet_cache, facelet);
+    assert(facelet);
+
+    if (!facelet_has_netdevice(facelet))
+        return -2;
+
+    netdevice_t netdevice;
+    if (facelet_get_netdevice(facelet, &netdevice) < 0)
+        return -1;
+    if (!IS_VALID_NETDEVICE(netdevice))
+        return -2;
+    facelet_set_status(facelet, FACELET_STATUS_CLEAN);
+
+    int n = facemgr_consider_static_facelet(facemgr, facelet);
+    if (n < 0) {
+        ERROR("[facemgr_process_facelet_get] Could not add facelet to static array");
+        return -1;
     }
-    return -2;
+    if (n == 1) {
+        /*
+         * As a static facelet, it receives a new id not to be confused in the
+         * cache with default facelets
+         */
+        facelet_set_id(facelet, ++facemgr->cur_static_id);
+    }
+
+    char facelet_s[MAXSZ_FACELET];
+    facelet_snprintf(facelet_s, MAXSZ_FACELET, facelet);
+    return facelet_set_add(facemgr->facelet_cache, facelet);
 }
 
 /**
@@ -1341,6 +1449,9 @@ int facemgr_process_facelet_first_time(facemgr_t * facemgr, facelet_t * facelet)
 {
     facelet_set_status(facelet, FACELET_STATUS_UNCERTAIN);
 
+    assert(facelet);
+    char facelet_s[MAXSZ_FACELET];
+    facelet_snprintf(facelet_s, MAXSZ_FACELET, facelet);
     if (facelet_set_add(facemgr->facelet_cache, facelet) < 0) {
         ERROR("[facemgr_process_facelet_first_time] Error adding facelet to cache");
         goto ERR_CACHE;
@@ -1372,15 +1483,28 @@ int
 facemgr_on_event(facemgr_t * facemgr, facelet_t * facelet_in)
 {
     bool remove_facelet = true;
+    bool dump = true;
     int ret = 0;
     int rc;
     assert(facelet_in);
 
+    /* Update Netdevice type */
+    if (facelet_has_netdevice(facelet_in) && (!facelet_has_netdevice_type(facelet_in))) {
+        netdevice_t netdevice = NETDEVICE_EMPTY;
+
+        rc = facelet_get_netdevice(facelet_in, &netdevice);
+        if (rc < 0) {
+            ERROR("[facemgr_on_event] Error retrieving netdevice from facelet");
+            return -1;
+        }
+        facelet_set_netdevice_type(facelet_in, facemgr_get_netdevice_type(facemgr, netdevice.name));
+    }
+
     char facelet_s[MAXSZ_FACELET];
     facelet_snprintf(facelet_s, MAXSZ_FACELET, facelet_in);
-    DEBUG("EVENT %s", facelet_s);
 
     facelet_t ** cached_facelets = NULL;
+    assert(facelet_in);
     int n = facelet_cache_lookup(facemgr->facelet_cache, facelet_in, &cached_facelets);
     if (n < 0) {
         ERROR("[facemgr_on_event] Error during cache lookup");
@@ -1399,18 +1523,9 @@ facemgr_on_event(facemgr_t * facemgr, facelet_t * facelet_in)
                  * Assumption: we should always see the link before the address
                  * assignment
                  */
+                DEBUG("[facemgr_on_event] CREATE NEW %s", facelet_s);
                 assert(!facelet_has_family(facelet_in));
 
-                if (!facelet_has_netdevice_type(facelet_in)) {
-                    netdevice_t netdevice = NETDEVICE_EMPTY;
-                    rc = facelet_get_netdevice(facelet_in, &netdevice);
-                    if (rc < 0) {
-                        ERROR("[facemgr_complement_facelet] Error retrieving netdevice from facelet");
-                        return -1;
-                    }
-                    facelet_set_netdevice_type(facelet_in, facemgr_get_netdevice_type(facemgr, netdevice.name));
-                }
-
                 /* Create default v4 and v6 facelets */
                 facelet_t * facelet_v4 = facelet_dup(facelet_in);
                 if (!facelet_v4) {
@@ -1472,7 +1587,7 @@ facemgr_on_event(facemgr_t * facemgr, facelet_t * facelet_in)
                             continue;
                         }
                         /* The id must be different than 0 */
-                        facelet_set_id(facelet_new, i+1);
+                        facelet_set_id(facelet_new, ++facemgr->cur_static_id);
                         facelet_set_status(facelet_new, FACELET_STATUS_CLEAN);
 
                         char buf[MAXSZ_FACELET];
@@ -1493,9 +1608,11 @@ facemgr_on_event(facemgr_t * facemgr, facelet_t * facelet_in)
 
             case FACELET_EVENT_GET:
                 /* Insert new facelet in cached */
+                DEBUG("[facemgr_on_event] GET NEW %s", facelet_s);
                 rc = facemgr_process_facelet_get(facemgr, facelet_in);
                 if (rc == 0)
                     remove_facelet = false;
+                dump = false;
                 if (rc == -1) {
                     ERROR("[facemgr_on_event] Error processing GET event");
                     goto ERR;
@@ -1506,20 +1623,21 @@ facemgr_on_event(facemgr_t * facemgr, facelet_t * facelet_in)
                 /* Might be because we previously ignored the facelet... */
                 //ERROR("[facemgr_on_event] Unexpected UPDATE... face does not exist");
                 //goto ERR;
+                DEBUG("[facemgr_on_event] UPDATE NEW %s", facelet_s);
                 INFO("Ignored UPDATE for non-existing face");
                 break;
 
             case FACELET_EVENT_DELETE:
+                DEBUG("[facemgr_on_event] DELETE NEW %s", facelet_s);
                 ERROR("[facemgr_on_event] Unexpected DELETE... face does not exist");
                 goto ERR;
 
             case FACELET_EVENT_UNDEFINED:
+            case FACELET_EVENT_N:
                 ERROR("[facemgr_on_event] Unexpected UNDEFINED event.");
+                ret = -1;
                 goto ERR;
 
-            default: /* XXX Some events should be deprecated */
-                ERROR("[facemgr_on_event] Deprecated event");
-                goto ERR;
         }
         goto DUMP_CACHE;
     }
@@ -1534,8 +1652,14 @@ facemgr_on_event(facemgr_t * facemgr, facelet_t * facelet_in)
          * reconciliation by sending appropriate updates to the forwarder
          */
         facelet_t * facelet = cached_facelets[i];
+
+        char facelet_s[MAXSZ_FACELET];
+        facelet_snprintf(facelet_s, MAXSZ_FACELET, facelet);
+        //DEBUG("Facelet from cache #%d %s", i, facelet_s);
+
         switch(facelet_get_event(facelet_in)) {
             case FACELET_EVENT_CREATE:
+                DEBUG("[facemgr_on_event] CREATE EXISTING %s", facelet_s);
                 // This case will occur when we try to re-create existing faces,
                 // eg. in the situation of a forwarder restarting.
                 // likely this occurs when the interface receives a (potentially new) address
@@ -1552,13 +1676,17 @@ facemgr_on_event(facemgr_t * facemgr, facelet_t * facelet_in)
                 continue;
 
             case FACELET_EVENT_GET: /* should be an INFORM message */
-                // FIXME, this might occur if the forwarder restarts and we
-                // resync faces...
-                ERROR("[facemgr_on_event] GET event for a face that already exists...");
-                ret = -1;
+                /*
+                 * This happens due to polling of the forwarder (or when it
+                 * restarts)
+                 */
+                DEBUG("[facemgr_on_event] GET EXISTING %s", facelet_s);
+                //ERROR("[facemgr_on_event] GET event for a face that already exists...");
+                dump = false;
                 continue;
 
             case FACELET_EVENT_UPDATE:
+                DEBUG("[facemgr_on_event] UPDATE EXISTING %s", facelet_s);
                 if (facelet_merge(facelet, facelet_in) < 0) {
                     ERROR("[facemgr_on_event] Error merging facelets");
                     continue;
@@ -1570,6 +1698,7 @@ facemgr_on_event(facemgr_t * facemgr, facelet_t * facelet_in)
                 continue;
 
             case FACELET_EVENT_DELETE:
+                DEBUG("[facemgr_on_event] DELETE EXISTING %s", facelet_s);
                 if (facelet_merge(facelet, facelet_in) < 0) {
                     ERROR("[facemgr_on_event] Error merging facelets");
                     continue;
@@ -1580,9 +1709,12 @@ facemgr_on_event(facemgr_t * facemgr, facelet_t * facelet_in)
                 }
                 continue;
 
-            default: /* XXX Some events should be deprecated */
-                ERROR("[facemgr_on_event] Deprecated event");
+            case FACELET_EVENT_UNDEFINED:
+            case FACELET_EVENT_N:
+                ERROR("[facemgr_on_event] Unexpected UNDEFINED event.");
                 ret = -1;
+                goto ERR;
+
         }
 
     }
@@ -1593,11 +1725,13 @@ ERR:
 
 DUMP_CACHE:
 #if 1
-    DEBUG("    <CACHE>");
-    facelet_set_dump(facemgr->facelet_cache);
-    DEBUG("    </CACHE>");
-    DEBUG("</EVENT ret=%d>", ret);
-    DEBUG("----------------------------------");
+    if (dump) {
+        DEBUG("    <CACHE>");
+        facelet_set_dump(facemgr->facelet_cache);
+        DEBUG("    </CACHE>");
+        DEBUG("</EVENT ret=%d>", ret);
+        DEBUG("----------------------------------");
+    }
 #endif
 
     free(cached_facelets);
diff --git a/ctrl/facemgr/src/facelet.c b/ctrl/facemgr/src/facelet.c
index 7a34b18c8..a7a1fd3ae 100644
--- a/ctrl/facemgr/src/facelet.c
+++ b/ctrl/facemgr/src/facelet.c
@@ -229,7 +229,8 @@ facelet_create_from_face(face_t * face)
     /* Attribute : netdevice */
     /* NOTE index is not set */
     if (IS_VALID_NETDEVICE(face->netdevice)) {
-        facelet->netdevice = face->netdevice;
+        /* /!\ A face has only the netdevice name */
+        netdevice_set_name(&facelet->netdevice, face->netdevice.name);
         facelet->netdevice_status = FACELET_ATTR_STATUS_CLEAN;
     } else {
         facelet->netdevice_status = FACELET_ATTR_STATUS_UNSET;
@@ -240,7 +241,7 @@ facelet_create_from_face(face_t * face)
     if (facelet->netdevice_type != NETDEVICE_TYPE_UNDEFINED) {
         facelet->netdevice_type_status = FACELET_ATTR_STATUS_CLEAN;
     } else {
-        facelet->netdevice = NETDEVICE_EMPTY;
+        facelet->netdevice_type = NETDEVICE_TYPE_UNDEFINED;
         facelet->netdevice_type_status = FACELET_ATTR_STATUS_UNSET;
     }
 
@@ -407,13 +408,32 @@ facelet_dup(const facelet_t * current_facelet)
     } else {
         for (unsigned i = 0; i < n; i++) {
             hicn_route_t * route = route_array[i];
-            route_set_add(facelet->routes, route);
+            hicn_route_t * new_route = hicn_route_dup(route);
+            if (!new_route)
+                goto ERR_ROUTE;
+            route_set_add(facelet->routes, new_route);
         }
     }
     free(route_array);
 
     return facelet;
 
+ERR_ROUTE:
+    {
+    /* Free all routes */
+    hicn_route_t ** new_route_array;
+    int n = route_set_get_array(facelet->routes, &new_route_array);
+    if (n < 0) {
+        ERROR("[facelet_free] Error getting route set associated to facelet");
+    } else {
+        for (unsigned i = 0; i < n; i++) {
+            hicn_route_t * new_route = new_route_array[i];
+            hicn_route_free(new_route);
+        }
+    }
+    free(route_array);
+    facelet_free(facelet);
+    }
 ERR_CREATE:
     return NULL;
 }
@@ -489,7 +509,6 @@ do {
     }                                                                           \
 } while(0)
 
-/* facelet_match is the incoming one */
 bool
 facelet_equals(const facelet_t * facelet1, const facelet_t * facelet2)
 {
diff --git a/ctrl/facemgr/src/interfaces/hicn_light/hicn_light.c b/ctrl/facemgr/src/interfaces/hicn_light/hicn_light.c
index 945b60af2..1b73c694f 100644
--- a/ctrl/facemgr/src/interfaces/hicn_light/hicn_light.c
+++ b/ctrl/facemgr/src/interfaces/hicn_light/hicn_light.c
@@ -28,17 +28,23 @@
 #include <hicn/util/log.h>
 #include <hicn/util/map.h>
 
+#include "../../common.h"
 #include "../../interface.h"
 
 #define DEFAULT_ROUTE_COST 0
 
 #define INTERVAL_MS 1000
 
+#define WITH_POLL
+
 typedef enum {
     HL_STATE_UNDEFINED,
-    HL_STATE_CONNECTING,
+    HL_STATE_IDLE,
+    HL_STATE_ROUTES_SENT,
+    HL_STATE_ROUTES_RECEIVED,
     HL_STATE_FACES_SENT,
-    HL_STATE_DONE,
+    HL_STATE_FACES_RECEIVED,
+    HL_STATE_N
 } hl_state_t;
 
 typedef struct {
@@ -50,31 +56,63 @@ typedef struct {
 
     /* Timer used to periodically poll the forwarder face and routing tables */
     int poll_timer_fd;
+    hc_data_t * polled_routes;
 } hl_data_t;
 
 /* Forward declarations */
 int hl_timeout(interface_t * interface, int fd, void * unused);
 
+#ifdef WITH_POLL
+int hl_process_state(interface_t * interface, int fd, void * unused)
+#else
 int hl_process_state(interface_t * interface)
+#endif
 {
     hl_data_t * data = (hl_data_t *)interface->data;
 
+    /*
+     * Every tick we need to probe the forwarder for the list of faces and
+     * associated routes.
+     *
+     * This is used to guess manually added faces and routes
+     *
+     * TODO ensure we are idle at tick time
+     */
+
     switch(data->state)
     {
-        case HL_STATE_UNDEFINED: // FIXME
-        case HL_STATE_CONNECTING: // FIXME
-            if (hc_face_list_async(data->s) < 0) {
-                /* Blocking call */
-                printf("Could not retrieve face list\n");
+        case HL_STATE_IDLE:
+            assert(!data->polled_routes);
+
+            //DEBUG("[hl_process_state] Querying route list");
+            if (hc_route_list_async(data->s) < 0) {
+                DEBUG("[hl_process_state] Error querying route list");
                 return -1;
             }
+            data->state = HL_STATE_ROUTES_SENT;
             break;
 
-        case HL_STATE_FACES_SENT:
+
+        case HL_STATE_ROUTES_RECEIVED:
+            //DEBUG("[hl_process_state] Querying face list");
+            if (hc_face_list_async(data->s) < 0) {
+                DEBUG("[hl_process_state] Error querying face list");
+                return -1;
+            }
+            data->state = HL_STATE_FACES_SENT;
+            break;
             break;
 
-        default: /* HL_STATE_DONE never called */
+        case HL_STATE_FACES_RECEIVED:
+            data->state = HL_STATE_IDLE;
             break;
+
+        case HL_STATE_ROUTES_SENT:
+        case HL_STATE_FACES_SENT:
+        case HL_STATE_UNDEFINED:
+        case HL_STATE_N:
+            ERROR("[hl_process_state] Unexpected state");
+            return -1;
     }
 
     return 0;
@@ -92,9 +130,21 @@ hl_after_connect(interface_t * interface)
         goto ERR_FD;
     }
 
-    data->state = HL_STATE_UNDEFINED;
+    /* We always restart from the idle phase */
+    data->state = HL_STATE_IDLE;
+
 
+/* poll will replace the original get, ideally we would get notifications */
+#ifdef WITH_POLL
+    data->poll_timer_fd = interface_register_timer(interface, INTERVAL_MS,
+            hl_process_state, interface);
+    if (data->poll_timer_fd < 0) {
+        ERROR("[hc_connect] Could not initialize polling timer");
+        return -1;
+    }
+#else
     hl_process_state(interface);
+#endif
 
     return 0;
 
@@ -108,6 +158,10 @@ int _hl_connect(interface_t * interface);
 int
 hl_connect_timeout(interface_t * interface, int fd, void * unused)
 {
+    hl_data_t * data = interface->data;
+    assert(fd == data->reconnect_timer_fd);
+    _unused(data);
+
     int rc = _hl_connect(interface);
     if (rc < 0) {
         DEBUG("[hl_initialize] Error during connection reattempt; next attempt in %ds", INTERVAL_MS / 1000);
@@ -156,6 +210,12 @@ int hl_disconnect(interface_t * interface)
     if (data->reconnect_timer_fd > 0)
         interface_unregister_timer(interface, data->reconnect_timer_fd);
 
+    if (data->poll_timer_fd > 0)
+        interface_unregister_timer(interface, data->poll_timer_fd);
+
+    if (data->polled_routes)
+        hc_data_free(data->polled_routes);
+
     if (data->s) {
         interface_unregister_fd(interface, hc_sock_get_fd(data->s));
         hc_sock_free(data->s);
@@ -194,6 +254,7 @@ hl_initialize(interface_t * interface, void * cfg)
 
     data->s = NULL;
     data->reconnect_timer_fd = 0;
+    data->poll_timer_fd = 0;
 
     interface->data = data;
 
@@ -202,6 +263,8 @@ hl_initialize(interface_t * interface, void * cfg)
         goto ERR_CONNECT;
     }
 
+    data->polled_routes = NULL;
+
     return 0;
 
 ERR_CONNECT:
@@ -216,6 +279,9 @@ int hl_finalize(interface_t * interface)
 
     hl_disconnect(interface);
 
+    if (data->polled_routes)
+        hc_data_free(data->polled_routes);
+
     free(data);
 
     return 0;
@@ -254,8 +320,10 @@ int hl_on_event(interface_t * interface, const facelet_t * facelet)
             {
             char buf[MAXSZ_FACELET];
             facelet_snprintf(buf, MAXSZ_FACELET, facelet);
-            printf("Create face %s\n", buf);
+            DEBUG("Create facelet %s", buf);
             }
+            hc_face.id = 0;
+            memset(hc_face.name, 0, sizeof(hc_face.name));
             hc_face.face = *face;
             rc = hc_face_create(data->s, &hc_face);
             if (rc < 0) {
@@ -393,38 +461,130 @@ ERR_FACE:
 int hl_callback(interface_t * interface, int fd, void * unused)
 {
     hl_data_t * data = (hl_data_t*)interface->data;
+    hc_data_t * results;
+    int ret = 0;
 
-    hc_data_t * faces;
-    if (hc_sock_callback(data->s, &faces) < 0){
+    /* In case of error, reconnect to forwarder */
+    if (hc_sock_callback(data->s, &results) < 0) {
         DEBUG("Closing socket... reconnecting...");
         if (interface_unregister_fd(interface, hc_sock_get_fd(data->s)) < 0) {
-            ERROR("[hl_initialize] Error registering fd");
+            ERROR("[hl_callback] Error unregistering fd");
+        }
+
+        /* Stopping poll timer */
+        if (interface_unregister_timer(interface, data->poll_timer_fd) < 0) {
+            ERROR("[hl_callback] Could not cancel polling timer after forwarder disconnect");
         }
+        if (data->polled_routes)
+            hc_data_free(data->polled_routes);
+
         hc_sock_free(data->s);
         data->s = NULL;
         hl_connect(interface);
-        return 0;
+        return ret;
     }
 
-    if (faces->complete) {
-        foreach_face(f, faces) {
+    /* Shall we wait for more data ? */
+    if (!results->complete)
+        return ret;
+
+    /* Process returned data */
+    switch(data->state) {
+
+        case HL_STATE_ROUTES_SENT:
+            //DEBUG("[hl_callback] Processing routes");
+            data->polled_routes = results;
+
 #if 0
-            char buf[MAXSZ_FACE];
-            hc_face_snprintf(buf, MAXSZ_FACE, f);
-            printf("Face: %s\n", buf);
+            foreach_route(r, results) {
+                char buf[MAXSZ_FACE];
+                int rc = hc_route_snprintf(route_s, MAXSZ_HC_ROUTE, r);
+                if (rc >= MAXSZ_HC_ROUTE)
+                    ERROR("[hl_callback] Unexpected truncation of route string");
+                if (rc < 0)
+                    ERROR("[hl_callback] Error during route string formatting");
+                DEBUG("Route: %s", buf);
+            }
 #endif
-            facelet_t * facelet = facelet_create_from_face(&f->face);
-            facelet_set_event(facelet, FACELET_EVENT_GET);
-            interface_raise_event(interface, facelet);
-        }
-    }
-    hc_data_free(faces);
+            data->state = HL_STATE_ROUTES_RECEIVED;
+            if (hl_process_state(interface, fd, unused) < 0) {
+                ERROR("[hl_callback] Error processing state after routes received");
+                ret = -1;
+            }
+            break;
 
-    /* XXX how do we know what object we get back */
 
-    /* We have a queue of pending data elements per active query */
+        case HL_STATE_FACES_SENT:
+            //DEBUG("[hl_callback] Processing faces");
+            assert(data->polled_routes);
+            foreach_face(f, results) {
 
-    return 0;
+#if 0
+                char buf[MAXSZ_FACE];
+                int rc = hc_face_snprintf(buf, MAXSZ_FACE, f);
+                if (rc >= MAXSZ_HC_FACE)
+                    ERROR("[hl_callback] Unexpected truncation of face string");
+                if (rc < 0)
+                    ERROR("[hl_callback] Error during face string formatting");
+
+                DEBUG("Face: %s", buf);
+#endif
+
+                /* We can ignore faces on localhost */
+
+                facelet_t * facelet = facelet_create_from_face(&f->face);
+                char facelet_s[MAXSZ_FACELET];
+                facelet_snprintf(facelet_s, MAXSZ_FACELET, facelet);
+                foreach_route(r, data->polled_routes) {
+                    if (r->face_id != f->id)
+                        continue;
+
+#if 0
+                    char route_s[MAXSZ_HC_ROUTE];
+                    int rc = hc_route_snprintf(route_s, MAXSZ_HC_ROUTE, r);
+                    if (rc >= MAXSZ_HC_ROUTE)
+                        ERROR("[hl_callback] Unexpected truncation of route string");
+                    if (rc < 0)
+                        ERROR("[hl_callback] Error during route string formatting");
+                    DEBUG("Associated route: %s", route_s);
+#endif
+
+                    if (r->len == 0)
+                        continue;
+
+                    ip_prefix_t prefix = {
+                        .family = r->family,
+                        .address = r->remote_addr,
+                        .len = r->len,
+                    };
+                    hicn_route_t * route = hicn_route_create(&prefix, r->face_id, r->cost);
+                    facelet_add_route(facelet, route);
+                }
+
+                facelet_snprintf(facelet_s, MAXSZ_FACELET, facelet);
+                facelet_set_event(facelet, FACELET_EVENT_GET);
+                interface_raise_event(interface, facelet);
+            }
+
+            hc_data_free(data->polled_routes);
+            data->polled_routes = NULL;
+            data->state = HL_STATE_FACES_RECEIVED;
+            if (hl_process_state(interface, fd, unused) < 0) {
+                ERROR("[hl_callback] Error processing state after faces received");
+                ret = -1;
+            }
+            break;
+
+        case HL_STATE_IDLE:
+        case HL_STATE_FACES_RECEIVED:
+        case HL_STATE_ROUTES_RECEIVED:
+        case HL_STATE_UNDEFINED:
+        case HL_STATE_N:
+            ERROR("[hl_callback] Unexpected state");
+            ret = -1;
+    }
+
+    return ret;
 }
 
 const interface_ops_t hicn_light_ops = {