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-rw-r--r--test/packetdrill/gre_packet.c56
1 files changed, 56 insertions, 0 deletions
diff --git a/test/packetdrill/gre_packet.c b/test/packetdrill/gre_packet.c
new file mode 100644
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--- /dev/null
+++ b/test/packetdrill/gre_packet.c
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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)
+ *
+ * Implementation for module for formatting GRE packets.
+ */
+
+#include "gre_packet.h"
+
+#include "ip_packet.h"
+#include "gre.h"
+
+int gre_header_append(struct packet *packet, const struct gre *gre, char **error)
+{
+ struct header *header;
+
+ header = packet_append_header(packet, HEADER_GRE, gre_len(gre));
+ if (header == NULL) {
+ asprintf(error, "too many headers");
+ return STATUS_ERR;
+ }
+
+ memcpy(header->h.gre, gre, gre_len(gre));
+
+ return STATUS_OK;
+}
+
+int gre_header_finish(struct packet *packet,
+ struct header *header, struct header *next_inner)
+{
+ struct gre *gre = header->h.gre;
+ int gre_bytes = gre_len(gre) + next_inner->total_bytes;
+
+ gre->proto = htons(header_type_info(next_inner->type)->eth_proto);
+
+ header->total_bytes = gre_bytes;
+
+ return STATUS_OK;
+}