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lib: optimize apply_mask_ipv6()

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This commit is contained in:
Denis Ovsienko 2011-10-18 22:02:52 +04:00
parent caff7905e2
commit 32ca973920
1 changed files with 7 additions and 17 deletions
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24
lib/prefix.c
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@ -660,23 +660,13 @@ masklen2ip6 (const int masklen, struct in6_addr *netmask)
void
apply_mask_ipv6 (struct prefix_ipv6 *p)
{
u_char *pnt;
int index;
int offset;
index = p->prefixlen / 8;
if (index < 16)
{
pnt = (u_char *) &p->prefix;
offset = p->prefixlen % 8;
pnt[index] &= maskbit[offset];
index++;
while (index < 16)
pnt[index++] = 0;
}
assert (p->prefixlen >= 0 && p->prefixlen <= IPV6_MAX_BITLEN);
u_int32_t *addr_word = (u_int32_t *) &p->prefix;
u_int32_t *mask_word = (u_int32_t *) (maskbytes6 + p->prefixlen);
*addr_word++ &= *mask_word++;
*addr_word++ &= *mask_word++;
*addr_word++ &= *mask_word++;
*addr_word &= *mask_word;
}
void