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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;
}
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