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937e75d8f1
This patch implements the IPv6 subset of the Babel routing protocol. Based on the patch from Toke Hoiland-Jorgensen, with some heavy modifications and bugfixes. Thanks to Toke Hoiland-Jorgensen for the original patch.
174 lines
3.6 KiB
C
174 lines
3.6 KiB
C
/*
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* BIRD Library
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*
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* (c) 1998--2004 Martin Mares <mj@ucw.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#ifndef _BIRD_BIRDLIB_H_
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#define _BIRD_BIRDLIB_H_
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#include "timer.h"
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#include "alloca.h"
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/* Ugly structure offset handling macros */
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#define OFFSETOF(s, i) ((size_t) &((s *)0)->i)
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#define SKIP_BACK(s, i, p) ((s *)((char *)p - OFFSETOF(s, i)))
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#define BIRD_ALIGN(s, a) (((s)+a-1)&~(a-1))
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/* Utility macros */
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#define MIN_(a,b) (((a)<(b))?(a):(b))
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#define MAX_(a,b) (((a)>(b))?(a):(b))
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#ifndef PARSER
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#undef MIN
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#undef MAX
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#define MIN(a,b) MIN_(a,b)
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#define MAX(a,b) MAX_(a,b)
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#endif
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#define U64(c) UINT64_C(c)
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#define ABS(a) ((a)>=0 ? (a) : -(a))
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#define DELTA(a,b) (((a)>=(b))?(a)-(b):(b)-(a))
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#define ARRAY_SIZE(a) (sizeof(a)/sizeof(*(a)))
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/* Bitfield macros */
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/* b is u32 array (or ptr), l is size of it in bits (multiple of 32), p is 0..(l-1) */
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#define BIT32_VAL(p) (((u32) 1) << ((p) % 32))
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#define BIT32_TEST(b,p) ((b)[(p)/32] & BIT32_VAL(p))
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#define BIT32_SET(b,p) ((b)[(p)/32] |= BIT32_VAL(p))
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#define BIT32_CLR(b,p) ((b)[(p)/32] &= ~BIT32_VAL(p))
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#define BIT32_ZERO(b,l) memset((b), 0, (l)/8)
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#ifndef NULL
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#define NULL ((void *) 0)
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#endif
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#ifndef IPV6
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#define IP_VERSION 4
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#else
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#define IP_VERSION 6
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#endif
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/* Macros for gcc attributes */
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#define NORET __attribute__((noreturn))
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#define UNUSED __attribute__((unused))
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#define PACKED __attribute__((packed))
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/* Microsecond time */
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typedef s64 btime;
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#define S_ *1000000
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#define MS_ *1000
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#define US_ *1
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#define TO_S /1000000
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#define TO_MS /1000
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#define TO_US /1
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#ifndef PARSER
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#define S S_
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#define MS MS_
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#define US US_
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#endif
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/* Rate limiting */
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struct tbf {
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bird_clock_t timestamp; /* Last update */
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u16 count; /* Available tokens */
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u16 burst; /* Max number of tokens */
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u16 rate; /* Rate of replenishment */
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u16 mark; /* Whether last op was limited */
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};
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/* Default TBF values for rate limiting log messages */
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#define TBF_DEFAULT_LOG_LIMITS { .rate = 1, .burst = 5 }
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void tbf_update(struct tbf *f);
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static inline int
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tbf_limit(struct tbf *f)
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{
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tbf_update(f);
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if (!f->count)
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{
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f->mark = 1;
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return 1;
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}
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f->count--;
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f->mark = 0;
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return 0;
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}
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/* Logging and dying */
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typedef struct buffer {
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byte *start;
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byte *pos;
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byte *end;
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} buffer;
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#define STACK_BUFFER_INIT(buf,size) \
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do { \
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buf.start = alloca(size); \
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buf.pos = buf.start; \
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buf.end = buf.start + size; \
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} while(0)
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#define LOG_BUFFER_INIT(buf) \
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STACK_BUFFER_INIT(buf, LOG_BUFFER_SIZE)
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#define LOG_BUFFER_SIZE 1024
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#define log log_msg
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void log_commit(int class, buffer *buf);
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void log_msg(const char *msg, ...);
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void log_rl(struct tbf *rl, const char *msg, ...);
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void die(const char *msg, ...) NORET;
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void bug(const char *msg, ...) NORET;
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#define L_DEBUG "\001" /* Debugging messages */
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#define L_TRACE "\002" /* Protocol tracing */
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#define L_INFO "\003" /* Informational messages */
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#define L_REMOTE "\004" /* Remote protocol errors */
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#define L_WARN "\005" /* Local warnings */
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#define L_ERR "\006" /* Local errors */
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#define L_AUTH "\007" /* Authorization failed etc. */
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#define L_FATAL "\010" /* Fatal errors */
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#define L_BUG "\011" /* BIRD bugs */
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void debug(const char *msg, ...); /* Printf to debug output */
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/* Debugging */
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#if defined(LOCAL_DEBUG) || defined(GLOBAL_DEBUG)
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#define DBG(x, y...) debug(x, ##y)
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#else
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#define DBG(x, y...) do { } while(0)
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#endif
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#ifdef DEBUGGING
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#define ASSERT(x) do { if (!(x)) bug("Assertion `%s' failed at %s:%d", #x, __FILE__, __LINE__); } while(0)
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#else
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#define ASSERT(x) do { } while(0)
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#endif
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/* Pseudorandom numbers */
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u32 random_u32(void);
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#endif
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