filter: CIDR-based filtering support

This patch adds CIDR-based filtering support. The current
implementation is O(n).

This patch also introduces the vector data type which is
used to store the IP address and the network mask.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/include/vector.h b/include/vector.h
new file mode 100644
index 0000000..5b05cba
--- /dev/null
+++ b/include/vector.h
@@ -0,0 +1,13 @@
+#ifndef _VECTOR_H_
+#define _VECTOR_H_
+
+#include <stdlib.h>
+
+struct vector;
+
+struct vector *vector_create(size_t size);
+void vector_destroy(struct vector *v);
+int vector_add(struct vector *v, void *data);
+int vector_iterate(struct vector *v, const void *data, int (*fcn)(const void *a, const void *b));
+
+#endif