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 routines used by clatd
17 */
18 #ifndef __CLATD_H__
19 #define __CLATD_H__
20
21 #include <stdlib.h>
22 #include <sys/uio.h>
23
24 struct tun_data;
25
26 #define MAXMTU 1500
27 #define PACKETLEN (MAXMTU + sizeof(struct tun_pi))
28 #define CLATD_VERSION "1.4"
29
30 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
31
32 // how frequently (in seconds) to poll for an address change while traffic is passing
33 #define INTERFACE_POLL_FREQUENCY 30
34
35 // how frequently (in seconds) to poll for an address change while there is no traffic
36 #define NO_TRAFFIC_INTERFACE_POLL_FREQUENCY 90
37
38 void stop_loop();
39 void configure_tun_ip(const struct tun_data *tunnel, const char *v4_addr, int mtu);
40 void set_capability(uint64_t target_cap);
41 void drop_root_but_keep_caps();
42 void open_sockets(struct tun_data *tunnel, uint32_t mark);
43 int ipv6_address_changed(const char *interface);
44 int configure_clat_ipv6_address(const struct tun_data *tunnel, const char *interface,
45 const char *src_addr);
46 int detect_mtu(const struct in6_addr *plat_subnet, uint32_t plat_suffix, uint32_t mark);
47 void configure_interface(const char *uplink_interface, const char *plat_prefix, const char *v4_addr,
48 const char *v6, struct tun_data *tunnel, uint32_t mark);
49 void event_loop(struct tun_data *tunnel);
50
51 /* function: parse_int
52 * parses a string as a decimal/hex/octal signed integer
53 * str - the string to parse
54 * out - the signed integer to write to, gets clobbered on failure
55 */
parse_int(const char * str,int * out)56 static inline int parse_int(const char *str, int *out) {
57 char *end_ptr;
58 *out = strtol(str, &end_ptr, 0);
59 return *str && !*end_ptr;
60 }
61
62 /* function: parse_unsigned
63 * parses a string as a decimal/hex/octal unsigned integer
64 * str - the string to parse
65 * out - the unsigned integer to write to, gets clobbered on failure
66 */
parse_unsigned(const char * str,unsigned * out)67 static inline int parse_unsigned(const char *str, unsigned *out) {
68 char *end_ptr;
69 *out = strtoul(str, &end_ptr, 0);
70 return *str && !*end_ptr;
71 }
72
73 #endif /* __CLATD_H__ */
74