1/*
2 * Copyright 2011 Daniel Drown
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 *
16 * clatd.h - main system definitions
17 */
18#ifndef __CLATD_H__
19#define __CLATD_H__
20
21#include <sys/uio.h>
22
23#define MAXMTU 1500
24#define PACKETLEN (MAXMTU+sizeof(struct tun_pi))
25#define CLATD_VERSION "1.4"
26
27#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
28
29// how frequently (in seconds) to poll for an address change while traffic is passing
30#define INTERFACE_POLL_FREQUENCY 30
31
32// how frequently (in seconds) to poll for an address change while there is no traffic
33#define NO_TRAFFIC_INTERFACE_POLL_FREQUENCY 90
34
35// A clat_packet is an array of iovec structures representing a packet that we are translating.
36// The CLAT_POS_XXX constants represent the array indices within the clat_packet that contain
37// specific parts of the packet. The packet_* functions operate on all the packet segments past a
38// given position.
39typedef enum {
40    CLAT_POS_TUNHDR, CLAT_POS_IPHDR, CLAT_POS_FRAGHDR, CLAT_POS_TRANSPORTHDR,
41    CLAT_POS_ICMPERR_IPHDR, CLAT_POS_ICMPERR_FRAGHDR, CLAT_POS_ICMPERR_TRANSPORTHDR,
42    CLAT_POS_PAYLOAD, CLAT_POS_MAX
43} clat_packet_index;
44typedef struct iovec clat_packet[CLAT_POS_MAX];
45
46#endif /* __CLATD_H__ */
47