Re: [libvirt] [PATCHv3 2/3] util: new virSocketAddrIsPrivate function

This new function returns true if the given address is in the range of any "private" or "local" networks as defined in RFC1918 (IPv4) or RFC3484/RFC4193 (IPv6), otherwise they return false. These ranges are: 192.168.0.0/16 172.16.0.0/16 10.0.0.0/24 FC00::/7 FEC0::/10 --- src/libvirt_private.syms | 1 + src/util/virsocketaddr.c | 34 +++++++++++++++++++++++++++++++++- src/util/virsocketaddr.h | 3 ++- 3 files changed, 36 insertions(+), 2 deletions(-) /* + * virSocketAddrIsPrivate: + * @s: the location of the IP address + * + * Return true if this address is in its family's defined + * "private/local" address space. For IPv4, private addresses are in + * the range of 192.168.0.0/16, 172.16.0.0/16, or 10.0.0.0/8. For + * IPv6, local addresses are in the range of FC00::/7. + * + * See RFC1918 and RFC4193 for details.

+ */ +bool +virSocketAddrIsPrivate(const virSocketAddrPtr addr) +{ + unsigned long val; + + switch (addr->data.stor.ss_family) { + case AF_INET: + val = ntohl(addr->data.inet4.sin_addr.s_addr); + + return ((val & 0xFFFF0000) == ((192L << 24) + (168 << 16)) || + (val & 0xFFFF0000) == ((172L << 24) + (16 << 16)) || + (val & 0xFF000000) == ((10L << 24))); + + case AF_INET6: + return ((addr->data.inet6.sin6_addr.s6_addr[0] & 0xFC) == 0xFC ||