clatd.h

/*
 * Copyright 2011 Daniel Drown
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * clatd.h - main system definitions
 */
#ifndef __CLATD_H__
#define __CLATD_H__

#include <sys/uio.h>

#define MAXMTU 1500
#define PACKETLEN (MAXMTU + sizeof(struct tun_pi))
#define CLATD_VERSION "1.4"

#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))

// how frequently (in seconds) to poll for an address change while traffic is passing
#define INTERFACE_POLL_FREQUENCY 30

// how frequently (in seconds) to poll for an address change while there is no traffic
#define NO_TRAFFIC_INTERFACE_POLL_FREQUENCY 90

// A clat_packet is an array of iovec structures representing a packet that we are translating.
// The CLAT_POS_XXX constants represent the array indices within the clat_packet that contain
// specific parts of the packet. The packet_* functions operate on all the packet segments past a
// given position.
typedef enum {
  CLAT_POS_TUNHDR,
  CLAT_POS_IPHDR,
  CLAT_POS_FRAGHDR,
  CLAT_POS_TRANSPORTHDR,
  CLAT_POS_ICMPERR_IPHDR,
  CLAT_POS_ICMPERR_FRAGHDR,
  CLAT_POS_ICMPERR_TRANSPORTHDR,
  CLAT_POS_PAYLOAD,
  CLAT_POS_MAX
} clat_packet_index;
typedef struct iovec clat_packet[CLAT_POS_MAX];

#endif /* __CLATD_H__ */