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ipv6: 64bit version of ipv6_prefix_equal().

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Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
YOSHIFUJI Hideaki / 吉藤英明 2013-01-14 07:10:38 +00:00 committed by David S. Miller
parent 2ef9733203
commit 38675170e4
1 changed files with 26 additions and 0 deletions
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26
include/net/ipv6.h
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@ -399,6 +399,31 @@ static inline bool ipv6_addr_equal(const struct in6_addr *a1,
#endif
}
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
const __be64 *a2,
unsigned int len)
{
if (len && ((*a1 ^ *a2) & cpu_to_be64(~0UL) << (64 - len)))
return false;
return true;
}
static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
const struct in6_addr *addr2,
unsigned int prefixlen)
{
const __be64 *a1 = (const __be64 *)addr1;
const __be64 *a2 = (const __be64 *)addr2;
if (prefixlen >= 64) {
if (a1[0] ^ a2[0])
return false;
return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
}
return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
}
#else
static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
const struct in6_addr *addr2,
unsigned int prefixlen)
@ -419,6 +444,7 @@ static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
return true;
}
#endif
struct inet_frag_queue;