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faster implementation of addr_in_subnet()

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This commit is contained in:
Andreas Steffen
2008-10-09 05:44:00 +00:00
parent bb2059c60a
commit 03d5f41137
1 changed files with 15 additions and 14 deletions
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src/charon/plugins/kernel_netlink/kernel_netlink_net.c
+15 -14
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@@ -696,28 +696,29 @@ static int get_interface_index(private_kernel_netlink_net_t *this, char* name)
*/
static bool addr_in_subnet(chunk_t addr, chunk_t net, int net_len)
{
int bit, byte;
static const u_char mask[] = { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe };
int byte = 0;
if (addr.len != net.len)
if (addr.len != net.len || net_len > 8 * net.len )
{
return FALSE;
}
/* scan through all bits, beginning at the front */
for (byte = 0; byte < addr.len; byte++)
{
for (bit = 0; bit < 8; bit++)
{
u_char bitpos = 1 << (7-bit);
/* check if bits are equal (or we reached the end of the net) */
if (bit + byte * 8 >= net_len)
{
return TRUE;
}
if ((bitpos & addr.ptr[byte]) != (bitpos & net.ptr[byte]))
/* scan through all bytes in network order */
while (net_len > 0)
{
if (net_len < 8)
{
return (mask[net_len] & addr.ptr[byte]) == (mask[net_len] & net.ptr[byte]);
}
else
{
if (addr.ptr[byte] != net.ptr[byte])
{
return FALSE;
}
byte++;
net_len -= 8;
}
}
return TRUE;