43 lines
802 B
Go
43 lines
802 B
Go
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package nettap
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import (
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"crypto/rand"
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"fmt"
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"net"
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"github.com/pkg/errors"
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)
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type TapNet struct {
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HostIP net.IP
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GuestIP net.IP
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HostCIDR string
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GuestCIDR string
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}
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func GenerateNet() (TapNet, error) {
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// This is a Linsk internal network IPv6 prefix.
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hostIP := []byte(net.ParseIP("fe8f:5980:3253:7df4:0f4b:6db1::"))
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_, err := rand.Read(hostIP[len(hostIP)-4:])
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if err != nil {
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return TapNet{}, errors.Wrap(err, "random read")
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}
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// Put the last bit to zero.
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hostIP[len(hostIP)-1] &= 0xfe
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guestIP := make([]byte, len(hostIP))
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copy(guestIP, hostIP)
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// Put the last bit to one.
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guestIP[len(hostIP)-1] |= 0x1
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return TapNet{
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HostIP: hostIP,
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GuestIP: guestIP,
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HostCIDR: fmt.Sprintf("%v/127", net.IP(hostIP)),
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GuestCIDR: fmt.Sprintf("%v/127", net.IP(guestIP)),
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}, nil
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}
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