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ip4r_funcs.h
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ip4r_funcs.h
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/* $Id$ */
static inline
uint32 hostmask(unsigned masklen)
{
return (masklen) ? ( (((uint32)(1U)) << (32-masklen)) - 1U ) : 0xFFFFFFFFU;
}
static inline
uint32 netmask(unsigned masklen)
{
return ~hostmask(masklen);
}
/* if LO and HI are ends of a CIDR prefix, return the mask length.
* If not, returns ~0.
*/
static inline
unsigned masklen(uint32 lo, uint32 hi)
{
uint32 d = (lo ^ hi) + 1;
/* at this point, d can be:
* 0 if A and B have all bits different
* 1 if A and B are equal
* 1 << (32-masklen)
* some other value if A and B are not ends of a CIDR range
* but in any case, after extracting the masklen, we have to
* recheck because some non-CIDR ranges will produce the same
* results.
*/
int fbit = ffs(d);
switch (fbit)
{
case 0: return (lo == 0 && hi == ~0) ? 0 : ~0;
case 1: return (lo == hi) ? 32 : ~0;
default:
if ( ((uint32)(1U) << (fbit-1)) == d )
{
uint32 mask = hostmask(33-fbit);
if ((lo & mask) == 0 && (hi & mask) == mask)
return 33-fbit;
}
return ~0;
}
}
static inline
bool ip4_valid_netmask(uint32 mask)
{
uint32 d = ~mask + 1;
/* at this point, d can be:
* 0 if mask was 0x00000000 (valid)
* 1 << (32-masklen) (valid)
* some other value (invalid)
*/
int fbit = ffs(d);
switch (fbit)
{
case 0:
return true;
default:
return ( ((uint32)(1U) << (fbit-1)) == d );
}
}
static inline
bool ip4r_from_cidr(IP4 prefix, unsigned masklen, IP4R *ipr)
{
uint32 mask = hostmask(masklen);
if (masklen > 32)
return FALSE;
if (prefix & mask)
return FALSE;
ipr->lower = prefix;
ipr->upper = prefix | mask;
return TRUE;
}
static inline
bool ip4r_from_inet(IP4 addr, unsigned masklen, IP4R *ipr)
{
uint32 mask = hostmask(masklen);
if (masklen > 32)
return FALSE;
ipr->lower = addr & ~mask;
ipr->upper = addr | mask;
return TRUE;
}
/* comparisons */
static inline
bool ip4_equal(IP4 a, IP4 b)
{
return (a == b);
}
static inline
bool ip4_lessthan(IP4 a, IP4 b)
{
return (a < b);
}
static inline
bool ip4_less_eq(IP4 a, IP4 b)
{
return (a <= b);
}
/* helpers for union/intersection for indexing */
static inline
IP4R *ip4r_union_internal(IP4R *a, IP4R *b, IP4R *result)
{
if (a->lower < b->lower)
result->lower = a->lower;
else
result->lower = b->lower;
if (a->upper > b->upper)
result->upper = a->upper;
else
result->upper = b->upper;
return result;
}
static inline
IP4R *ip4r_inter_internal(IP4R *a, IP4R *b, IP4R *result)
{
if (a->upper < b->lower || a->lower > b->upper)
{
/* disjoint */
result->lower = 1;
result->upper = 0; /* INVALID VALUE */
return NULL;
}
if (a->upper < b->upper)
result->upper = a->upper;
else
result->upper = b->upper;
if (a->lower > b->lower)
result->lower = a->lower;
else
result->lower = b->lower;
return result;
}
static inline
double ip4r_metric(IP4R *v)
{
if (!v)
return 0.0;
return ((v->upper - v->lower) + 1.0);
}
static inline
bool ip4r_equal(IP4R *a, IP4R *b)
{
return (a->lower == b->lower && a->upper == b->upper);
}
static inline
bool ip4r_lessthan(IP4R *a, IP4R *b)
{
return (a->lower == b->lower) ? (a->upper < b->upper) : (a->lower < b->lower);
}
static inline
bool ip4r_less_eq(IP4R *a, IP4R *b)
{
return (a->lower == b->lower) ? (a->upper <= b->upper) : (a->lower < b->lower);
}
static inline
bool ip4r_contains_internal(IP4R *left, IP4R *right, bool eqval)
{
if (ip4r_equal(left,right))
return eqval;
return ((left->lower <= right->lower) && (left->upper >= right->upper));
}
static inline
bool ip4r_overlaps_internal(IP4R *left, IP4R *right)
{
return (left->upper >= right->lower && left->lower <= right->upper);
}
static inline
bool ip4_contains_internal(IP4R *left, IP4 right)
{
return (left->lower <= right && left->upper >= right);
}
static inline
bool ip4r_left_internal(IP4R *left, IP4R *right)
{
return (left->upper < right->lower);
}
static inline
bool ip4r_extends_left_of_internal(IP4R *left, IP4R *right)
{
return (left->lower < right->lower);
}
static inline
bool ip4r_extends_right_of_internal(IP4R *left, IP4R *right)
{
return (left->upper > right->upper);
}
/* end */