[PATCH 6/6] ipv6: 64bit version of ipv6_prefix_equal().
From: YOSHIFUJI Hideaki <hidden>
Date: 2013-01-14 17:10:40
Subsystem:
networking [general], networking [ipv4/ipv6], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, David Ahern, Ido Schimmel, Linus Torvalds
Signed-off-by: YOSHIFUJI Hideaki <redacted> --- include/net/ipv6.h | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+)
diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index fe95053..3d32a8e 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h@@ -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;
--
1.7.9.5