Re: [libvirt] [PATCHv2 02/13] New virNetworkDef utility functions

Later patches will add the possibility to define a network's netmask as a prefix (0-32, or 0-128 in the case of IPv6). To make it easier to deal with definition of both kinds (prefix or netmask), add two new functions: virNetworkDefNetmask: return a copy of the netmask into a virSocketAddr. If no netmask was specified in the XML, create a default netmask based on the network class of the virNetworkDef's IP address. virNetworkDefPrefix: return the netmask as numeric prefix (or the default prefix for the network class of the virNetworkDef's IP address, if no netmask was specified in the XML)

+int virNetworkDefPrefix(const virNetworkDefPtr def) +{ + if (VIR_SOCKET_HAS_ADDR(&def->netmask)) { + return virSocketGetNumNetmaskBits(&def->netmask); + } else if (VIR_SOCKET_IS_FAMILY(&def->ipAddress, AF_INET)) { + /* Return the natural prefix for the network's ip address. + * On Linux we could use the IN_CLASSx() macros, but those + * aren't guaranteed on all platforms, so we just deal with + * the bits ourselves. + */ + const unsigned char *octets + = (const unsigned char *)(&def->ipAddress.data.inet4.sin_addr.s_addr);