func NewIngressChain(chain [4]int) (*IngressChain, error) {
cflags := []string{
fmt.Sprintf("-DCHAIN_VALUE0=%#x", chain[0]),
fmt.Sprintf("-DCHAIN_VALUE1=%#x", chain[1]),
fmt.Sprintf("-DCHAIN_VALUE2=%#x", chain[2]),
fmt.Sprintf("-DCHAIN_VALUE3=%#x", chain[3]),
}
//Debug.Printf("netdev: %v\n", cflags)
bpf := bpf.NewBpfModule(bpf.NetdevRxC, cflags)
if bpf == nil {
return nil, fmt.Errorf("NewIngressChain bpf compile failed")
}
defer bpf.Close()
fd, err := bpf.LoadNet("ingress")
if err != nil {
return nil, err
}
fd2, err := syscall.Dup(fd)
if err != nil {
return nil, err
}
return &IngressChain{fd: fd2}, nil
}
func (ifc *ExtInterface) FD() int {
if ifc.NodeBase.FD() >= 0 {
return ifc.NodeBase.FD()
}
cflags := []string{
fmt.Sprintf("-DINTERFACE_ID=%d", ifc.link.Attrs().Index),
}
bpf := bpf.NewBpfModule(bpf.NetdevTxC, cflags)
if bpf == nil {
panic(fmt.Errorf("Failed to compile bpf module for %s egress", ifc.Path()))
}
// free the llvm memory, just keep the fd
defer bpf.Close()
fd, err := bpf.LoadNet("egress")
if err != nil {
panic(err)
}
fd2, err := syscall.Dup(fd)
if err != nil {
panic(err)
}
ifc.NodeBase.SetFD(fd2)
return ifc.NodeBase.FD()
}