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b1f53d8d25
Recent merge of cert-v2 support introduced the ability to tunnel IPv6. However, FreeBSD's IPv6 tunneling does not work for 2 reasons: * The ifconfig commands did not work for IPv6 addresses * The tunnel device was not configured for link-layer mode, so it only supported IPv4 This PR improves FreeBSD tunneling support in 3 ways: * Use ioctl instead of exec'ing ifconfig to configure the interface, with additional logic to support IPv6 * Configure the tunnel in link-layer mode, allowing IPv6 traffic * Use readv() and writev() to communicate with the tunnel device, to avoid the need to copy the packet buffer