ipcpd: normal: Establish N-1 management flows

This adds the intial implementation of establishing management N-1
flows between normal IPCPs. On calling fmgr_mgmt_flow, a management
flow will be setup to a certain destination IPCP. After flow
allocation, the fd is handed to the RIB manager. The flow manager also
listens for incoming flow requests. In case they are management flows,
they are handed to the RIB manager, otherwise to the FRCT.

1 files changed, 242 insertions, 0 deletions

diff --git a/src/ipcpd/normal/fmgr.c b/src/ipcpd/normal/fmgr.c
new file mode 100644
index 00000000..9521805f
--- /dev/null
+++ b/src/ipcpd/normal/fmgr.c
@@ -0,0 +1,242 @@
+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * Flow manager of the IPC Process
+ *
+ *    Sander Vrijders <sander.vrijders@intec.ugent.be>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#define OUROBOROS_PREFIX "flow-manager"
+
+#include <ouroboros/config.h>
+#include <ouroboros/logs.h>
+#include <ouroboros/dev.h>
+#include <ouroboros/list.h>
+
+#include <stdlib.h>
+#include <stdbool.h>
+#include <pthread.h>
+#include <string.h>
+
+#include "fmgr.h"
+#include "ribmgr.h"
+#include "frct.h"
+
+struct n_1_flow {
+        int fd;
+        char * ae_name;
+        struct list_head next;
+};
+
+struct fmgr {
+        pthread_t listen_thread;
+
+        struct list_head n_1_flows;
+        pthread_mutex_t n_1_flows_lock;
+
+} * instance = NULL;
+
+static int add_n_1_fd(int fd,
+                      char * ae_name)
+{
+        struct n_1_flow * tmp;
+
+        if (ae_name == NULL)
+                return -1;
+
+        tmp = malloc(sizeof(*tmp));
+        if (tmp == NULL)
+                return -1;
+
+        tmp->fd = fd;
+        tmp->ae_name = ae_name;
+
+        pthread_mutex_lock(&instance->n_1_flows_lock);
+        list_add(&tmp->next, &instance->n_1_flows);
+        pthread_mutex_unlock(&instance->n_1_flows_lock);
+
+        return 0;
+}
+
+static void * fmgr_listen(void * o)
+{
+        int fd;
+        char * ae_name;
+
+        while (true) {
+                fd = flow_accept(&ae_name);
+                if (fd < 0) {
+                        LOG_ERR("Failed to accept flow.");
+                        continue;
+                }
+
+                if (!(strcmp(ae_name, MGMT_AE) == 0 ||
+                      strcmp(ae_name, DT_AE) == 0)) {
+                        if (flow_alloc_resp(fd, -1))
+                                LOG_ERR("Failed to reply to flow allocation.");
+                        flow_dealloc(fd);
+                        continue;
+                }
+
+                if (flow_alloc_resp(fd, 0)) {
+                        LOG_ERR("Failed to reply to flow allocation.");
+                        flow_dealloc(fd);
+                        continue;
+                }
+
+                LOG_DBG("Accepted new flow allocation request for AE %s.",
+                        ae_name);
+
+                if (strcmp(ae_name, MGMT_AE) == 0 &&
+                    ribmgr_mgmt_flow(fd)) {
+                        LOG_ERR("Failed to hand file descriptor to RIB.");
+                        flow_dealloc(fd);
+                        continue;
+                }
+
+                if (strcmp(ae_name, DT_AE) == 0 &&
+                    frct_dt_flow(fd)) {
+                        LOG_ERR("Failed to hand file descriptor to FRCT.");
+                        flow_dealloc(fd);
+                        continue;
+                }
+
+                if (add_n_1_fd(fd, ae_name)) {
+                        LOG_ERR("Failed to add file descriptor to list.");
+                        flow_dealloc(fd);
+                        continue;
+                }
+        }
+
+        return (void *) 0;
+}
+
+int fmgr_init()
+{
+        instance = malloc(sizeof(*instance));
+        if (instance == NULL) {
+                return -1;
+        }
+
+        INIT_LIST_HEAD(&instance->n_1_flows);
+
+        pthread_mutex_init(&instance->n_1_flows_lock, NULL);
+
+        pthread_create(&instance->listen_thread,
+                       NULL,
+                       fmgr_listen,
+                       NULL);
+
+        return 0;
+}
+
+int fmgr_fini()
+{
+        struct list_head * pos = NULL;
+
+        pthread_cancel(instance->listen_thread);
+
+        pthread_join(instance->listen_thread,
+                     NULL);
+
+        list_for_each(pos, &instance->n_1_flows) {
+                struct n_1_flow * e =
+                        list_entry(pos, struct n_1_flow, next);
+                if (e->ae_name != NULL)
+                        free(e->ae_name);
+                flow_dealloc(e->fd);
+        }
+
+        free(instance);
+
+        return 0;
+}
+
+int fmgr_mgmt_flow(char * dst_name)
+{
+        int fd;
+        int result;
+
+        /* FIXME: Request retransmission. */
+        fd = flow_alloc(dst_name, MGMT_AE, NULL);
+        if (fd < 0) {
+                LOG_ERR("Failed to allocate flow to %s", dst_name);
+                return -1;
+        }
+
+        result = flow_alloc_res(fd);
+        if (result < 0) {
+                LOG_ERR("Result of flow allocation to %s is %d",
+                        dst_name, result);
+                return -1;
+        }
+
+        if (ribmgr_mgmt_flow(fd)) {
+                LOG_ERR("Failed to hand file descriptor to RIB manager");
+                flow_dealloc(fd);
+                return -1;
+        }
+
+        if (add_n_1_fd(fd, strdup(MGMT_AE))) {
+                LOG_ERR("Failed to add file descriptor to list.");
+                flow_dealloc(fd);
+                return -1;
+        }
+
+        return 0;
+}
+
+int fmgr_dt_flow(char * dst_name)
+{
+        LOG_MISSING;
+
+        return -1;
+}
+
+int fmgr_flow_alloc(pid_t         n_api,
+                    int           port_id,
+                    char *        dst_ap_name,
+                    char *        src_ae_name,
+                    enum qos_cube qos)
+{
+        LOG_MISSING;
+
+        return -1;
+}
+
+int fmgr_flow_alloc_resp(pid_t n_api,
+                         int   port_id,
+                         int   response)
+{
+        LOG_MISSING;
+
+        return -1;
+}
+
+int fmgr_flow_dealloc(int port_id)
+{
+        LOG_MISSING;
+
+        return -1;
+}
+
+int fmgr_flow_msg()
+{
+        LOG_MISSING;
+
+        return -1;
+}