Re: [libvirt] [PATCHv3] Support for static routes on a virtual bridge

This patch adds support for adding a static route for a network. The "gateway" sub-element specifies the gateway's IP address. Both IPv4 and IPv6 static routes are supported although it is expected that this functionality will have more use with IPv6. This updates add the <route> element to define a static route. The gateway= subelement species the gateway address which is to receive the packets forwarded to the network specified on the <route> definition. Tests are done to validate that the input definitions are correct. For example, for a static route ip definition, the address must be a network address and not a host address. Additional checks are added to ensure that the specified gateway has a network defined on this bridge. Whan a static route is added to a bridge, there is a slight possibility that the gateway address will be incorrect. If this is handled as an error, that bridge becomes unusable and can only be recovered by rebooting. If the error is ignored, then that network can be destroyed and the network definition file edited to correct the problem. Unfortunately, the error message only appears in syslog. However, with the checks performed when the network definition file is parsed, it is unlikely that this condition will ever occur. The command used is of the following form: ip route add <address>/<prefix> via <gateway> dev <virbr-bridge> \ proto static metric 1