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.
39 typedef 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;
44 typedef struct iovec clat_packet[CLAT_POS_MAX];
45 
46 #endif /* __CLATD_H__ */
47