rework NFCT to use a generic hashtable

This patch introduces a generic hashtable to store the nf_conntrack objects.
The objects are identified by the original and reply tuples instead of the
conntrack ID which is not dumped in the event message of linux kernel < 2.6.25.
This patch also fixes the NFCT_MSG_* by NFCT_T_* which is the appropriate
message type tag.

1 files changed, 48 insertions, 0 deletions

diff --git a/include/ulogd/hash.h b/include/ulogd/hash.h
new file mode 100644
index 0000000..45d2f48
--- /dev/null
+++ b/include/ulogd/hash.h
@@ -0,0 +1,48 @@
+#ifndef _NF_SET_HASH_H_
+#define _NF_SET_HASH_H_
+
+#include <unistd.h>
+#include "slist.h"
+#include <ulogd/linuxlist.h>
+
+#include <stdint.h>
+
+struct hashtable;
+struct hashtable_node;
+
+struct hashtable {
+	uint32_t hashsize;
+	uint32_t limit;
+	uint32_t count;
+	uint32_t initval;
+	uint32_t datasize;
+
+	uint32_t	(*hash)(const void *data, struct hashtable *table);
+	int		(*compare)(const void *data1, const void *data2);
+
+	struct slist_head 	members[0];
+};
+
+struct hashtable_node {
+	struct slist_head head;
+	char data[0];
+};
+
+struct hashtable_node *hashtable_alloc_node(int datasize, void *data);
+void hashtable_destroy_node(struct hashtable_node *h);
+
+struct hashtable *
+hashtable_create(int hashsize, int limit, int datasize,
+		 uint32_t (*hash)(const void *data, struct hashtable *table),
+		 int (*compare)(const void *data1, const void *data2));
+void hashtable_destroy(struct hashtable *h);
+
+void *hashtable_add(struct hashtable *table, void *data);
+void *hashtable_get(struct hashtable *table, const void *data);
+int hashtable_del(struct hashtable *table, void *data);
+int hashtable_flush(struct hashtable *table);
+int hashtable_iterate(struct hashtable *table, void *data,
+		      int (*iterate)(void *data1, void *data2));
+unsigned int hashtable_counter(const struct hashtable *table);
+
+#endif