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      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 <linux/if.h>
     22 #include <linux/if_tun.h>
     23 
     24 #define MAXMTU 1500
     25 #define PACKETLEN (MAXMTU+sizeof(struct tun_pi))
     26 #define CLATD_VERSION "1.3"
     27 
     28 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
     29 
     30 // how frequently (in seconds) to poll for an address change while traffic is passing
     31 #define INTERFACE_POLL_FREQUENCY 30
     32 
     33 // how frequently (in seconds) to poll for an address change while there is no traffic
     34 #define NO_TRAFFIC_INTERFACE_POLL_FREQUENCY 90
     35 
     36 struct tun_data {
     37   char device4[IFNAMSIZ];
     38   int read_fd6, write_fd6, fd4;
     39 };
     40 
     41 #endif /* __CLATD_H__ */
     42