babeld/util.h

   1 /*
   2 Copyright (c) 2007, 2008 by Juliusz Chroboczek
   3 Copyright 2011 by Matthieu Boutier and Juliusz Chroboczek
   4
   5 Permission is hereby granted, free of charge, to any person obtaining a copy
   6 of this software and associated documentation files (the "Software"), to deal
   7 in the Software without restriction, including without limitation the rights
   8 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   9 copies of the Software, and to permit persons to whom the Software is
  10 furnished to do so, subject to the following conditions:
  11
  12 The above copyright notice and this permission notice shall be included in
  13 all copies or substantial portions of the Software.
  14
  15 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  18 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  21 THE 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"
  30 #include "memory.h"
  31
  32 DECLARE_MGROUP(BABELD)
  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
  61 static inline int
  62 seqno_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
  70 static inline short
  71 seqno_minus(unsigned short s1, unsigned short s2)
  72 {
  73     return (short)((s1 - s2) & 0xFFFF);
  74 }
  75
  76 static inline unsigned short
  77 seqno_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). */
  84 static inline unsigned int
  85 time_us(const struct timeval t)
  86 {
  87     return (unsigned int) (t.tv_sec * 1000000 + t.tv_usec);
  88 }
  89
  90 int roughly(int value);
  91 void timeval_minus(struct timeval *d,
  92                    const struct timeval *s1, const struct timeval *s2);
  93 unsigned timeval_minus_msec(const struct timeval *s1, const struct timeval *s2)
  94     ATTRIBUTE ((pure));
  95 void timeval_add_msec(struct timeval *d, const struct timeval *s, int msecs);
  96 void set_timeout (struct timeval *timeout, int msecs);
  97 int timeval_compare(const struct timeval *s1, const struct timeval *s2)
  98     ATTRIBUTE ((pure));
  99 void timeval_min(struct timeval *d, const struct timeval *s);
 100 void timeval_min_sec(struct timeval *d, time_t secs);
 101 int parse_nat(const char *string) ATTRIBUTE ((pure));
 102 int parse_msec(const char *string) ATTRIBUTE ((pure));
 103 int in_prefix(const unsigned char *restrict address,
 104               const unsigned char *restrict prefix, unsigned char plen)
 105     ATTRIBUTE ((pure));
 106 unsigned char *mask_prefix(unsigned char *restrict ret,
 107                            const unsigned char *restrict prefix,
 108                            unsigned char plen);
 109 const char *format_address(const unsigned char *address);
 110 const char *format_prefix(const unsigned char *address, unsigned char prefix);
 111 const char *format_eui64(const unsigned char *eui);
 112 const char *format_thousands(unsigned int value);
 113 int parse_address(const char *address, unsigned char *addr_r, int *af_r);
 114 int parse_eui64(const char *eui, unsigned char *eui_r);
 115 int wait_for_fd(int direction, int fd, int msecs);
 116 int martian_prefix(const unsigned char *prefix, int plen) ATTRIBUTE ((pure));
 117 int linklocal(const unsigned char *address) ATTRIBUTE ((pure));
 118 int v4mapped(const unsigned char *address) ATTRIBUTE ((pure));
 119 void v4tov6(unsigned char *dst, const unsigned char *src);
 120 void inaddr_to_uchar(unsigned char *dest, const struct in_addr *src);
 121 void uchar_to_inaddr(struct in_addr *dest, const unsigned char *src);
 122 void in6addr_to_uchar(unsigned char *dest, const struct in6_addr *src);
 123 void uchar_to_in6addr(struct in6_addr *dest, const unsigned char *src);
 124 int daemonise(void);
 125 const unsigned char v4prefix[16];
 126
 127 /* If debugging is disabled, we want to avoid calling format_address
 128    for every omitted debugging message.  So debug is a macro.  But
 129    vararg macros are not portable. */
 130 #if defined NO_DEBUG
 131
 132 #if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
 133 #define debugf(...) do {} while(0)
 134 #elif defined __GNUC__
 135 #define debugf(_args...) do {} while(0)
 136 #else
 137 static inline void debugf(int level, const char *format, ...) { return; }
 138 #endif
 139
 140 #else /* NO_DEBUG */
 141
 142 /* some levels */
 143 #define BABEL_DEBUG_COMMON      (1 << 0)
 144 #define BABEL_DEBUG_KERNEL      (1 << 1)
 145 #define BABEL_DEBUG_FILTER      (1 << 2)
 146 #define BABEL_DEBUG_TIMEOUT     (1 << 3)
 147 #define BABEL_DEBUG_IF          (1 << 4)
 148 #define BABEL_DEBUG_ROUTE       (1 << 5)
 149 #define BABEL_DEBUG_ALL         (0xFFFF)
 150
 151 #if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
 152 #define debugf(level, ...) \
 153 do { \
 154 if(UNLIKELY(debug & level)) zlog_debug(__VA_ARGS__);     \
 155 } while(0)
 156 #elif defined __GNUC__
 157 #define debugf(level, _args...) \
 158 do { \
 159 if(UNLIKELY(debug & level)) zlog_debug(_args);   \
 160 } while(0)
 161 #else
 162 static inline void debugf(int level, const char *format, ...) { return; }
 163 #endif
 164
 165 #endif /* NO_DEBUG */
 166
 167 #endif /* BABEL_UTIL_H */