ipcpd: normal: Refactor application entities and add neighbors struct

This refactors the different Application Entities of the normal
IPCP. They all listen to and use the connection manager to establish
new application connections.

This commit also adds a neighbors struct to the normal IPCP. It
contains neighbor structs that contain application
connection. Notifiers can be registered in case a neighbor changes
(added, removed, QoS changed).

The flow manager has an instance of this neighbors struct and listens
to these events to update its flow set. The routing component also
listens to these events so that it can update the FSDB if needed. The
flow manager now also creates the PFF instances and the routing
instances per QoS cube.

The RIB manager also uses this an instance of the neighbors struct and
listens to neighbor events as well.

1 files changed, 17 insertions, 279 deletions

diff --git a/src/ipcpd/normal/gam.c b/src/ipcpd/normal/gam.c
index 212cfd83..cb4e662f 100644
--- a/src/ipcpd/normal/gam.c
+++ b/src/ipcpd/normal/gam.c
@@ -1,7 +1,7 @@
 /*
  * Ouroboros - Copyright (C) 2016 - 2017
  *
- * Graph adjacency manager for IPC Process components
+ *  Data transfer graph adjacency manager
  *
  *    Dimitri Staessens <dimitri.staessens@intec.ugent.be>
  *    Sander Vrijders   <sander.vrijders@intec.ugent.be>
@@ -20,7 +20,7 @@
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
-#define OUROBOROS_PREFIX "graph-adjacency-manager"
+#define OUROBOROS_PREFIX "dt-gam"
 
 #include <ouroboros/config.h>
 #include <ouroboros/cdap.h>
@@ -40,305 +40,43 @@
 #include <pthread.h>
 #include <string.h>
 
-struct ga {
-        struct list_head    next;
-
-        qosspec_t           qs;
-        int                 fd;
-        struct conn_info *  info;
-};
-
 struct gam {
-        struct list_head     gas;
-        pthread_mutex_t      gas_lock;
-        pthread_cond_t       gas_cond;
-
         struct pol_gam_ops * ops;
         void *               ops_o;
 };
 
-struct gam * gam_create(enum pol_gam gam_type)
+struct gam * gam_create(enum pol_gam gam_type,
+                        struct nbs * nbs,
+                        struct ae *  ae)
 {
-        struct gam * tmp;
+        struct gam * gam;
 
-        tmp = malloc(sizeof(*tmp));
-        if (tmp == NULL)
+        gam = malloc(sizeof(*gam));
+        if (gam == NULL)
                 return NULL;
 
         switch (gam_type) {
         case COMPLETE:
-                tmp->ops = &complete_ops;
+                gam->ops = &complete_ops;
                 break;
         default:
                 log_err("Unknown gam policy: %d.", gam_type);
-                free(tmp);
-                return NULL;
-        }
-
-        list_head_init(&tmp->gas);
-
-        if (pthread_mutex_init(&tmp->gas_lock, NULL)) {
-                free(tmp);
-                return NULL;
-        }
-
-        if (pthread_cond_init(&tmp->gas_cond, NULL)) {
-                pthread_mutex_destroy(&tmp->gas_lock);
-                free(tmp);
                 return NULL;
         }
 
-        tmp->ops_o = tmp->ops->create(tmp);
-        if (tmp->ops_o == NULL) {
-                pthread_cond_destroy(&tmp->gas_cond);
-                pthread_mutex_destroy(&tmp->gas_lock);
-                free(tmp);
+        gam->ops_o = gam->ops->create(nbs, ae);
+        if (gam->ops_o == NULL) {
+                free(gam);
                 return NULL;
         }
 
-        if (tmp->ops->start(tmp->ops_o)) {
-                pthread_cond_destroy(&tmp->gas_cond);
-                pthread_mutex_destroy(&tmp->gas_lock);
-                free(tmp);
-                return NULL;
-        }
-
-        return tmp;
-}
-
-void gam_destroy(struct gam * instance)
-{
-        struct list_head * p = NULL;
-        struct list_head * n = NULL;
-
-        assert(instance);
-
-        instance->ops->stop(instance->ops_o);
-
-        pthread_mutex_lock(&instance->gas_lock);
-
-        list_for_each_safe(p, n, &instance->gas) {
-                struct ga * e = list_entry(p, struct ga, next);
-                list_del(&e->next);
-                free(e->info);
-                free(e);
-        }
-
-        pthread_mutex_unlock(&instance->gas_lock);
-
-        pthread_mutex_destroy(&instance->gas_lock);
-        pthread_cond_destroy(&instance->gas_cond);
-
-        instance->ops->destroy(instance->ops_o);
-        free(instance);
-}
-
-static int add_ga(struct gam *       instance,
-                  int                fd,
-                  qosspec_t          qs,
-                  struct conn_info * info)
-{
-        struct ga * ga;
-
-        ga = malloc(sizeof(*ga));
-        if (ga == NULL)
-                return -ENOMEM;
-
-        ga->fd = fd;
-        ga->info = info;
-        ga->qs = qs;
-
-        list_head_init(&ga->next);
-
-        pthread_mutex_lock(&instance->gas_lock);
-        list_add(&ga->next, &instance->gas);
-        pthread_cond_signal(&instance->gas_cond);
-        pthread_mutex_unlock(&instance->gas_lock);
-
-        log_info("Added flow.");
-
-        return 0;
-}
-
-int gam_flow_arr(struct gam * instance,
-                 int          fd,
-                 qosspec_t    qs)
-{
-        struct conn_info * rcv_info;
-        struct conn_info snd_info;
-
-        if (flow_alloc_resp(fd, instance->ops->accept_new_flow(instance->ops_o))
-            < 0) {
-                log_err("Could not respond to new flow.");
-                return -1;
-        }
-
-        rcv_info = malloc(sizeof(*rcv_info));
-        if (rcv_info == NULL)
-                return -ENOMEM;
-
-        memset(&snd_info, 0, sizeof(snd_info));
-        memset(rcv_info, 0, sizeof(*rcv_info));
-
-        /* FIXME: send correct AE */
-        strcpy(snd_info.ae_name, "FIXME:CORRECT_AE");
-        strcpy(snd_info.protocol, CDAP_PROTO);
-        snd_info.pref_version = 1;
-        snd_info.pref_syntax = PROTO_GPB;
-        snd_info.addr = ipcpi.dt_addr;
-
-        if (cacep_rcv(fd, rcv_info)) {
-                log_err("Error establishing application connection.");
-                flow_dealloc(fd);
-                free(rcv_info);
-                return -1;
-        }
-
-        if (cacep_snd(fd, &snd_info)) {
-                log_err("Failed to respond to application connection request.");
-                flow_dealloc(fd);
-                free(rcv_info);
-                return -1;
-        }
-
-        if (strcmp(snd_info.ae_name, rcv_info->ae_name)) {
-                log_err("Received connection for wrong AE.");
-                flow_dealloc(fd);
-                free(rcv_info);
-                return -1;
-        }
-
-        if (strcmp(snd_info.protocol, rcv_info->protocol) ||
-            snd_info.pref_version != rcv_info->pref_version ||
-            snd_info.pref_syntax != rcv_info->pref_syntax) {
-                flow_dealloc(fd);
-                free(rcv_info);
-                return -1;
-        }
-
-        if (instance->ops->accept_flow(instance->ops_o, qs, rcv_info)) {
-                flow_dealloc(fd);
-                free(rcv_info);
-                return 0;
-        }
-
-        if (add_ga(instance, fd, qs, rcv_info)) {
-                log_err("Failed to add ga to graph adjacency manager list.");
-                flow_dealloc(fd);
-                free(rcv_info);
-                return -1;
-        }
-
-        return 0;
+        return gam;
 }
 
-int gam_flow_alloc(struct gam * instance,
-                   char *       dst_name,
-                   qosspec_t    qs)
+void gam_destroy(struct gam * gam)
 {
-        struct conn_info * rcv_info;
-        struct conn_info snd_info;
-        int                 fd;
-
-        log_dbg("Allocating flow to %s.", dst_name);
-
-        rcv_info = malloc(sizeof(*rcv_info));
-        if (rcv_info == NULL)
-                return -ENOMEM;
-
-        fd = flow_alloc(dst_name, NULL);
-        if (fd < 0) {
-                log_err("Failed to allocate flow to %s.", dst_name);
-                return -1;
-        }
-
-        if (flow_alloc_res(fd)) {
-                log_err("Flow allocation to %s failed.", dst_name);
-                flow_dealloc(fd);
-                return -1;
-        }
-
-        memset(&snd_info, 0, sizeof(snd_info));
-        memset(rcv_info, 0, sizeof(*rcv_info));
-
-        /* FIXME: send correct AE */
-        strcpy(snd_info.ae_name, "FIXME:CORRECT_AE");
-        strcpy(snd_info.protocol, CDAP_PROTO);
-        snd_info.pref_version = 1;
-        snd_info.pref_syntax = PROTO_GPB;
-        snd_info.addr = ipcpi.dt_addr;
-
-        if (cacep_snd(fd, &snd_info)) {
-                log_err("Failed to create application connection.");
-                flow_dealloc(fd);
-                free(rcv_info);
-                return -1;
-        }
-
-        if (cacep_rcv(fd, rcv_info)) {
-                log_err("Failed to connect to application.");
-                flow_dealloc(fd);
-                free(rcv_info);
-                return -1;
-        }
-
-        if (strcmp(snd_info.protocol, rcv_info->protocol) ||
-            snd_info.pref_version != rcv_info->pref_version ||
-            snd_info.pref_syntax != rcv_info->pref_syntax) {
-                flow_dealloc(fd);
-                free(rcv_info);
-                return -1;
-        }
-
-        if (instance->ops->accept_flow(instance->ops_o, qs, rcv_info)) {
-                flow_dealloc(fd);
-                free(rcv_info);
-                return 0;
-        }
-
-        if (add_ga(instance, fd, qs, rcv_info)) {
-                log_err("Failed to add GA to graph adjacency manager list.");
-                flow_dealloc(fd);
-                free(rcv_info);
-                return -1;
-        }
-
-        return 0;
-}
-
-int gam_flow_wait(struct gam *        instance,
-                  int *               fd,
-                  struct conn_info ** info,
-                  qosspec_t *         qs)
-{
-        struct ga * ga;
-
-        assert(fd);
-        assert(info);
-        assert(qs);
-
-        pthread_mutex_lock(&instance->gas_lock);
-
-        pthread_cleanup_push((void(*)(void *))pthread_mutex_unlock,
-                             (void *) &instance->gas_lock);
-
-        while (list_is_empty(&instance->gas))
-                pthread_cond_wait(&instance->gas_cond, &instance->gas_lock);
-
-        ga = list_first_entry((&instance->gas), struct ga, next);
-        if (ga == NULL) {
-                pthread_mutex_unlock(&instance->gas_lock);
-                return -1;
-        }
-
-        *fd   = ga->fd;
-        *info = ga->info;
-        *qs   = ga->qs;
-
-        list_del(&ga->next);
-        free(ga);
-
-        pthread_cleanup_pop(true);
+        assert(gam);
 
-        return 0;
+        gam->ops->destroy(gam->ops_o);
+        free(gam);
 }