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package xt
import (
"github.com/google/nftables/alignedbuff"
)
// Rev. 0, see https://elixir.bootlin.com/linux/v5.17.7/source/include/uapi/linux/netfilter/xt_addrtype.h#L38
type AddrType struct {
Source uint16
Dest uint16
InvertSource bool
InvertDest bool
}
type AddrTypeFlags uint32
const (
AddrTypeUnspec AddrTypeFlags = 1 << iota
AddrTypeUnicast
AddrTypeLocal
AddrTypeBroadcast
AddrTypeAnycast
AddrTypeMulticast
AddrTypeBlackhole
AddrTypeUnreachable
AddrTypeProhibit
AddrTypeThrow
AddrTypeNat
AddrTypeXresolve
)
// See https://elixir.bootlin.com/linux/v5.17.7/source/include/uapi/linux/netfilter/xt_addrtype.h#L31
type AddrTypeV1 struct {
Source uint16
Dest uint16
Flags AddrTypeFlags
}
func (x *AddrType) marshal(fam TableFamily, rev uint32) ([]byte, error) {
ab := alignedbuff.New()
ab.PutUint16(x.Source)
ab.PutUint16(x.Dest)
putBool32(&ab, x.InvertSource)
putBool32(&ab, x.InvertDest)
return ab.Data(), nil
}
func (x *AddrType) unmarshal(fam TableFamily, rev uint32, data []byte) error {
ab := alignedbuff.NewWithData(data)
var err error
if x.Source, err = ab.Uint16(); err != nil {
return nil
}
if x.Dest, err = ab.Uint16(); err != nil {
return nil
}
if x.InvertSource, err = bool32(&ab); err != nil {
return nil
}
if x.InvertDest, err = bool32(&ab); err != nil {
return nil
}
return nil
}
func (x *AddrTypeV1) marshal(fam TableFamily, rev uint32) ([]byte, error) {
ab := alignedbuff.New()
ab.PutUint16(x.Source)
ab.PutUint16(x.Dest)
ab.PutUint32(uint32(x.Flags))
return ab.Data(), nil
}
func (x *AddrTypeV1) unmarshal(fam TableFamily, rev uint32, data []byte) error {
ab := alignedbuff.NewWithData(data)
var err error
if x.Source, err = ab.Uint16(); err != nil {
return nil
}
if x.Dest, err = ab.Uint16(); err != nil {
return nil
}
var flags uint32
if flags, err = ab.Uint32(); err != nil {
return nil
}
x.Flags = AddrTypeFlags(flags)
return nil
}
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