Merged in sandervrijders/ouroboros/be-pff (pull request #324)

lib, ipcpd: Add hashtable and PDU Forwarding Function

1 files changed, 151 insertions, 0 deletions

diff --git a/src/ipcpd/normal/pff.c b/src/ipcpd/normal/pff.c
new file mode 100644
index 00000000..99774ece
--- /dev/null
+++ b/src/ipcpd/normal/pff.c
@@ -0,0 +1,151 @@
+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * PDU Forwarding Function
+ *
+ *    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 "pff"
+
+#include <ouroboros/config.h>
+#include <ouroboros/logs.h>
+#include <ouroboros/hashtable.h>
+#include <ouroboros/errno.h>
+
+#include <assert.h>
+#include <pthread.h>
+
+#include "pff.h"
+
+struct pff {
+        struct htable * table;
+        pthread_mutex_t lock;
+};
+
+struct pff * pff_create(void)
+{
+        struct pff * tmp;
+
+        tmp = malloc(sizeof(*tmp));
+        if (tmp == NULL)
+                return NULL;
+
+        tmp->table = htable_create(PFT_SIZE, false);
+        if (tmp->table == NULL) {
+                free(tmp);
+                return NULL;
+        }
+
+        pthread_mutex_init(&tmp->lock, NULL);
+
+        return tmp;
+}
+
+int pff_destroy(struct pff * instance)
+{
+        assert(instance);
+
+        htable_destroy(instance->table);
+        pthread_mutex_destroy(&instance->lock);
+        free(instance);
+
+        return 0;
+}
+
+int pff_add(struct pff * instance, uint64_t addr, int fd)
+{
+        int * val;
+
+        assert(instance);
+
+        val = malloc(sizeof(*val));
+        if (val == NULL)
+                return -ENOMEM;
+        *val = fd;
+
+        pthread_mutex_lock(&instance->lock);
+        if (htable_insert(instance->table, addr, val)) {
+                pthread_mutex_unlock(&instance->lock);
+                free(val);
+                return -1;
+        }
+        pthread_mutex_unlock(&instance->lock);
+
+        return 0;
+}
+
+int pff_update(struct pff * instance, uint64_t addr, int fd)
+{
+        int * val;
+
+        assert(instance);
+
+        val = malloc(sizeof(*val));
+        if (val == NULL)
+                return -ENOMEM;
+        *val = fd;
+
+        pthread_mutex_lock(&instance->lock);
+        if (htable_delete(instance->table, addr)) {
+                pthread_mutex_unlock(&instance->lock);
+                free(val);
+                return -1;
+        }
+
+        if (htable_insert(instance->table, addr, val)) {
+                pthread_mutex_unlock(&instance->lock);
+                free(val);
+                return -1;
+        }
+        pthread_mutex_unlock(&instance->lock);
+
+        return 0;
+}
+
+int pff_remove(struct pff * instance, uint64_t addr)
+{
+        assert(instance);
+
+        pthread_mutex_lock(&instance->lock);
+        if (htable_delete(instance->table, addr)) {
+                pthread_mutex_unlock(&instance->lock);
+                return -1;
+        }
+        pthread_mutex_unlock(&instance->lock);
+
+        return 0;
+}
+
+int pff_nhop(struct pff * instance, uint64_t addr)
+{
+        int * j;
+        int   fd;
+
+        assert(instance);
+
+        pthread_mutex_lock(&instance->lock);
+        j = (int *) htable_lookup(instance->table, addr);
+        if (j == NULL) {
+                pthread_mutex_unlock(&instance->lock);
+                return -1;
+        }
+        fd = *j;
+        pthread_mutex_unlock(&instance->lock);
+
+        return fd;
+}