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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 MPLS packets.
*/
#include "mpls_packet.h"
#include "mpls.h"
int new_mpls_stack_entry(s64 label, s64 traffic_class,
bool is_stack_bottom, s64 ttl,
struct mpls *mpls, char **error)
{
if ((label < 0) || (label >= (1<<20))) {
asprintf(error, "MPLS label out of range for 20 bits");
return STATUS_ERR;
}
if ((traffic_class < 0) || (traffic_class >= (1<<3))) {
asprintf(error, "MPLS traffic_class out of range for 3 bits");
return STATUS_ERR;
}
if ((ttl < 0) || (ttl >= (1<<8))) {
asprintf(error, "MPLS ttl out of range for 8 bits");
return STATUS_ERR;
}
mpls_entry_set(label, traffic_class, is_stack_bottom, ttl, mpls);
return STATUS_OK;
}
int mpls_header_append(struct packet *packet, struct mpls_stack *mpls_stack,
char **error)
{
struct header *header;
int mpls_bytes = mpls_stack->length * sizeof(struct mpls);
header = packet_append_header(packet, HEADER_MPLS, mpls_bytes);
if (header == NULL) {
asprintf(error, "too many headers");
return STATUS_ERR;
}
memcpy(header->h.mpls, mpls_stack->entries, mpls_bytes);
return STATUS_OK;
}
int mpls_header_finish(struct packet *packet,
struct header *header, struct header *next_inner)
{
int mpls_bytes = header->header_bytes + next_inner->total_bytes;
header->total_bytes = mpls_bytes;
return STATUS_OK;
}
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