netfilter_abi_autogen_unsafe.go

// Automatically generated marshal implementation. See tools/go_marshal.

package netfilter

import (
	"io"
	"reflect"
	"runtime"
	"unsafe"

	"github.com/ttpreport/gvisor-ligolo/pkg/abi/linux"
	"github.com/ttpreport/gvisor-ligolo/pkg/gohacks"
	"github.com/ttpreport/gvisor-ligolo/pkg/hostarch"
	"github.com/ttpreport/gvisor-ligolo/pkg/marshal"
)

// Marshallable types used by this file.
var _ marshal.Marshallable = (*linux.NFNATRange)(nil)
var _ marshal.Marshallable = (*linux.XTEntryTarget)(nil)
var _ marshal.Marshallable = (*nfNATTarget)(nil)

// SizeBytes implements marshal.Marshallable.SizeBytes.
func (n *nfNATTarget) SizeBytes() int {
	return 0 +
		(*linux.XTEntryTarget)(nil).SizeBytes() +
		(*linux.NFNATRange)(nil).SizeBytes()
}

// MarshalBytes implements marshal.Marshallable.MarshalBytes.
func (n *nfNATTarget) MarshalBytes(dst []byte) []byte {
	dst = n.Target.MarshalUnsafe(dst)
	dst = n.Range.MarshalUnsafe(dst)
	return dst
}

// UnmarshalBytes implements marshal.Marshallable.UnmarshalBytes.
func (n *nfNATTarget) UnmarshalBytes(src []byte) []byte {
	src = n.Target.UnmarshalUnsafe(src)
	src = n.Range.UnmarshalUnsafe(src)
	return src
}

// Packed implements marshal.Marshallable.Packed.
//
//go:nosplit
func (n *nfNATTarget) Packed() bool {
	return n.Range.Packed() && n.Target.Packed()
}

// MarshalUnsafe implements marshal.Marshallable.MarshalUnsafe.
func (n *nfNATTarget) MarshalUnsafe(dst []byte) []byte {
	if n.Range.Packed() && n.Target.Packed() {
		size := n.SizeBytes()
		gohacks.Memmove(unsafe.Pointer(&dst[0]), unsafe.Pointer(n), uintptr(size))
		return dst[size:]
	}
	// Type nfNATTarget doesn't have a packed layout in memory, fallback to MarshalBytes.
	return n.MarshalBytes(dst)
}

// UnmarshalUnsafe implements marshal.Marshallable.UnmarshalUnsafe.
func (n *nfNATTarget) UnmarshalUnsafe(src []byte) []byte {
	if n.Range.Packed() && n.Target.Packed() {
		size := n.SizeBytes()
		gohacks.Memmove(unsafe.Pointer(n), unsafe.Pointer(&src[0]), uintptr(size))
		return src[size:]
	}
	// Type nfNATTarget doesn't have a packed layout in memory, fallback to UnmarshalBytes.
	return n.UnmarshalBytes(src)
}

// CopyOutN implements marshal.Marshallable.CopyOutN.
func (n *nfNATTarget) CopyOutN(cc marshal.CopyContext, addr hostarch.Addr, limit int) (int, error) {
	if !n.Range.Packed() && n.Target.Packed() {
		// Type nfNATTarget doesn't have a packed layout in memory, fall back to MarshalBytes.
		buf := cc.CopyScratchBuffer(n.SizeBytes()) // escapes: okay.
		n.MarshalBytes(buf)                        // escapes: fallback.
		return cc.CopyOutBytes(addr, buf[:limit])  // escapes: okay.
	}

	// Construct a slice backed by dst's underlying memory.
	var buf []byte
	hdr := (*reflect.SliceHeader)(unsafe.Pointer(&buf))
	hdr.Data = uintptr(gohacks.Noescape(unsafe.Pointer(n)))
	hdr.Len = n.SizeBytes()
	hdr.Cap = n.SizeBytes()

	length, err := cc.CopyOutBytes(addr, buf[:limit]) // escapes: okay.
	// Since we bypassed the compiler's escape analysis, indicate that n
	// must live until the use above.
	runtime.KeepAlive(n) // escapes: replaced by intrinsic.
	return length, err
}

// CopyOut implements marshal.Marshallable.CopyOut.
func (n *nfNATTarget) CopyOut(cc marshal.CopyContext, addr hostarch.Addr) (int, error) {
	return n.CopyOutN(cc, addr, n.SizeBytes())
}

// CopyIn implements marshal.Marshallable.CopyIn.
func (n *nfNATTarget) CopyIn(cc marshal.CopyContext, addr hostarch.Addr) (int, error) {
	if !n.Range.Packed() && n.Target.Packed() {
		// Type nfNATTarget doesn't have a packed layout in memory, fall back to UnmarshalBytes.
		buf := cc.CopyScratchBuffer(n.SizeBytes()) // escapes: okay.
		length, err := cc.CopyInBytes(addr, buf)   // escapes: okay.
		// Unmarshal unconditionally. If we had a short copy-in, this results in a
		// partially unmarshalled struct.
		n.UnmarshalBytes(buf) // escapes: fallback.
		return length, err
	}

	// Construct a slice backed by dst's underlying memory.
	var buf []byte
	hdr := (*reflect.SliceHeader)(unsafe.Pointer(&buf))
	hdr.Data = uintptr(gohacks.Noescape(unsafe.Pointer(n)))
	hdr.Len = n.SizeBytes()
	hdr.Cap = n.SizeBytes()

	length, err := cc.CopyInBytes(addr, buf) // escapes: okay.
	// Since we bypassed the compiler's escape analysis, indicate that n
	// must live until the use above.
	runtime.KeepAlive(n) // escapes: replaced by intrinsic.
	return length, err
}

// WriteTo implements io.WriterTo.WriteTo.
func (n *nfNATTarget) WriteTo(writer io.Writer) (int64, error) {
	if !n.Range.Packed() && n.Target.Packed() {
		// Type nfNATTarget doesn't have a packed layout in memory, fall back to MarshalBytes.
		buf := make([]byte, n.SizeBytes())
		n.MarshalBytes(buf)
		length, err := writer.Write(buf)
		return int64(length), err
	}

	// Construct a slice backed by dst's underlying memory.
	var buf []byte
	hdr := (*reflect.SliceHeader)(unsafe.Pointer(&buf))
	hdr.Data = uintptr(gohacks.Noescape(unsafe.Pointer(n)))
	hdr.Len = n.SizeBytes()
	hdr.Cap = n.SizeBytes()

	length, err := writer.Write(buf)
	// Since we bypassed the compiler's escape analysis, indicate that n
	// must live until the use above.
	runtime.KeepAlive(n) // escapes: replaced by intrinsic.
	return int64(length), err
}