1 files changed, 69 insertions, 0 deletions
diff --git a/test/packetdrill/ip_prefix.h b/test/packetdrill/ip_prefix.h
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+++ b/test/packetdrill/ip_prefix.h
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+/*
+ * Copyright 2013 Google Inc.
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+/*
+ * Author: ncardwell@google.com (Neal Cardwell)
+ *
+ * Types and operations for IPv4 and IPv6 address prefixes.
+ */
+
+#ifndef __IP_PREFIX_H__
+#define __IP_PREFIX_H__
+
+#include "types.h"
+
+#include "ip_address.h"
+
+/* IPv4 or IPv6 address prefix. */
+struct ip_prefix {
+	struct ip_address ip;
+	int prefix_len;			/* prefix length in bits */
+};
+
+static inline void ip_prefix_reset(struct ip_prefix *prefix)
+{
+	memset(prefix, 0, sizeof(*prefix));
+}
+
+/* Parse a human-readable IPv4 prefix and return it. Print an error
+ * to stderr and exit if there is an error parsing the prefix.
+ */
+extern struct ip_prefix ipv4_prefix_parse(const char *prefix_string);
+
+/* Parse a human-readable IPv6 prefix and return it. Print an error
+ * to stderr and exit if there is an error parsing the prefix.
+ */
+extern struct ip_prefix ipv6_prefix_parse(const char *prefix_string);
+
+/* Fill in the given prefix using the first 'prefix_len' bits of the
+ * given IP address, zeroing out bits beyond the prefix length.
+ */
+extern struct ip_prefix ip_to_prefix(const struct ip_address *ip,
+				     int prefix_len);
+
+/* Zero the bits beyond the prefix length. */
+void ip_prefix_normalize(struct ip_prefix *prefix);
+
+/* Print a human-readable representation of the given IP prefix in the
+ * given buffer, which must be at least ADDR_STR_LEN bytes long.
+ * Returns a pointer to the given buffer.
+ */
+extern const char *ip_prefix_to_string(struct ip_prefix *prefix,
+				       char *buffer);
+
+#endif /* __IP_PREFIX_H__ */