From 9505d3c6deda0452c22ab2ed47bca74b98d87a17 Mon Sep 17 00:00:00 2001 From: Tom Gundersen Date: Fri, 16 May 2014 00:27:56 +0200 Subject: networkd: IP address equality --- src/network/networkd-address.c | 43 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) (limited to 'src/network/networkd-address.c') diff --git a/src/network/networkd-address.c b/src/network/networkd-address.c index 6977fe7947..34863b2f69 100644 --- a/src/network/networkd-address.c +++ b/src/network/networkd-address.c @@ -508,3 +508,46 @@ int config_parse_label(const char *unit, return 0; } + +bool address_equal(Address *a1, Address *a2) { + /* same object */ + if (a1 == a2) + return true; + + /* one, but not both, is NULL */ + if (!a1 || !a2) + return false; + + if (a1->family != a2->family) + return false; + + switch (a1->family) { + /* use the same notion of equality as the kernel does */ + case AF_UNSPEC: + return true; + + case AF_INET: + if (a1->prefixlen != a2->prefixlen) + return false; + else { + uint32_t b1, b2; + + b1 = be32toh(a1->in_addr.in.s_addr); + b2 = be32toh(a2->in_addr.in.s_addr); + + return (b1 >> (32 - a1->prefixlen)) == (b2 >> (32 - a1->prefixlen)); + } + + case AF_INET6: + { + uint64_t *b1, *b2; + + b1 = (uint64_t*)&a1->in_addr.in6; + b2 = (uint64_t*)&a2->in_addr.in6; + + return (((b1[0] ^ b2[0]) | (b1[1] ^ b2[1])) == 0UL); + } + default: + assert_not_reached("Invalid address family"); + } +} -- cgit v1.2.3-54-g00ecf