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1/*
2Copyright (c) 2007, 2008 by Juliusz Chroboczek
3Copyright 2011 by Matthieu Boutier and Juliusz Chroboczek
4
5Permission is hereby granted, free of charge, to any person obtaining a copy
6of this software and associated documentation files (the "Software"), to deal
7in the Software without restriction, including without limitation the rights
8to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9copies of the Software, and to permit persons to whom the Software is
10furnished to do so, subject to the following conditions:
11
12The above copyright notice and this permission notice shall be included in
13all copies or substantial portions of the Software.
14
15THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
21THE SOFTWARE.
22*/
23
24#ifndef BABEL_UTIL_H
25#define BABEL_UTIL_H
26
27#include "babeld.h"
28#include "babel_main.h"
29#include "log.h"
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30#include "memory.h"
31
bf8d3d6a 32DECLARE_MGROUP(BABELD);
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33
34#if defined(i386) || defined(__mc68020__) || defined(__x86_64__)
35#define DO_NTOHS(_d, _s) do{ _d = ntohs(*(const unsigned short*)(_s)); }while(0)
36#define DO_NTOHL(_d, _s) do{ _d = ntohl(*(const unsigned*)(_s)); } while(0)
37#define DO_HTONS(_d, _s) do{ *(unsigned short*)(_d) = htons(_s); } while(0)
38#define DO_HTONL(_d, _s) do{ *(unsigned*)(_d) = htonl(_s); } while(0)
39/* Some versions of gcc seem to be buggy, and ignore the packed attribute.
40 Disable this code until the issue is clarified. */
41/* #elif defined __GNUC__*/
42#else
43#define DO_NTOHS(_d, _s) \
44 do { short _dd; \
45 memcpy(&(_dd), (_s), 2); \
46 _d = ntohs(_dd); } while(0)
47#define DO_NTOHL(_d, _s) \
48 do { int _dd; \
49 memcpy(&(_dd), (_s), 4); \
50 _d = ntohl(_dd); } while(0)
51#define DO_HTONS(_d, _s) \
52 do { unsigned short _dd; \
53 _dd = htons(_s); \
54 memcpy((_d), &(_dd), 2); } while(0)
55#define DO_HTONL(_d, _s) \
56 do { unsigned _dd; \
57 _dd = htonl(_s); \
58 memcpy((_d), &(_dd), 4); } while(0)
59#endif
60
61static inline int
62seqno_compare(unsigned short s1, unsigned short s2)
63{
64 if(s1 == s2)
65 return 0;
66 else
67 return ((s2 - s1) & 0x8000) ? 1 : -1;
68}
69
70static inline short
71seqno_minus(unsigned short s1, unsigned short s2)
72{
73 return (short)((s1 - s2) & 0xFFFF);
74}
75
76static inline unsigned short
77seqno_plus(unsigned short s, int plus)
78{
79 return ((s + plus) & 0xFFFF);
80}
81
82/* Returns a time in microseconds on 32 bits (thus modulo 2^32,
83 i.e. about 4295 seconds). */
84static inline unsigned int
85time_us(const struct timeval t)
86{
87 return (unsigned int) (t.tv_sec * 1000000 + t.tv_usec);
88}
89
90int roughly(int value);
91void timeval_minus(struct timeval *d,
92 const struct timeval *s1, const struct timeval *s2);
93unsigned timeval_minus_msec(const struct timeval *s1, const struct timeval *s2)
94 ATTRIBUTE ((pure));
95void timeval_add_msec(struct timeval *d, const struct timeval *s, int msecs);
96void set_timeout (struct timeval *timeout, int msecs);
97int timeval_compare(const struct timeval *s1, const struct timeval *s2)
98 ATTRIBUTE ((pure));
99void timeval_min(struct timeval *d, const struct timeval *s);
100void timeval_min_sec(struct timeval *d, time_t secs);
101int parse_nat(const char *string) ATTRIBUTE ((pure));
102int parse_msec(const char *string) ATTRIBUTE ((pure));
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103unsigned char *mask_prefix(unsigned char *restrict ret,
104 const unsigned char *restrict prefix,
105 unsigned char plen);
106const char *format_address(const unsigned char *address);
107const char *format_prefix(const unsigned char *address, unsigned char prefix);
108const char *format_eui64(const unsigned char *eui);
109const char *format_thousands(unsigned int value);
110int parse_address(const char *address, unsigned char *addr_r, int *af_r);
111int parse_eui64(const char *eui, unsigned char *eui_r);
112int wait_for_fd(int direction, int fd, int msecs);
113int martian_prefix(const unsigned char *prefix, int plen) ATTRIBUTE ((pure));
114int linklocal(const unsigned char *address) ATTRIBUTE ((pure));
115int v4mapped(const unsigned char *address) ATTRIBUTE ((pure));
116void v4tov6(unsigned char *dst, const unsigned char *src);
117void inaddr_to_uchar(unsigned char *dest, const struct in_addr *src);
118void uchar_to_inaddr(struct in_addr *dest, const unsigned char *src);
119void in6addr_to_uchar(unsigned char *dest, const struct in6_addr *src);
120void uchar_to_in6addr(struct in6_addr *dest, const unsigned char *src);
121int daemonise(void);
b0ba81f8 122extern const unsigned char v4prefix[16];
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123
124/* If debugging is disabled, we want to avoid calling format_address
125 for every omitted debugging message. So debug is a macro. But
126 vararg macros are not portable. */
127#if defined NO_DEBUG
128
ca10883e 129#define debugf(...) do {} while(0)
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130
131#else /* NO_DEBUG */
132
133/* some levels */
134#define BABEL_DEBUG_COMMON (1 << 0)
135#define BABEL_DEBUG_KERNEL (1 << 1)
136#define BABEL_DEBUG_FILTER (1 << 2)
137#define BABEL_DEBUG_TIMEOUT (1 << 3)
138#define BABEL_DEBUG_IF (1 << 4)
139#define BABEL_DEBUG_ROUTE (1 << 5)
140#define BABEL_DEBUG_ALL (0xFFFF)
141
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142#define debugf(level, ...) \
143do { \
144if(UNLIKELY(debug & level)) zlog_debug(__VA_ARGS__); \
145} while(0)
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146
147#endif /* NO_DEBUG */
148
149#endif /* BABEL_UTIL_H */