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helpers.go
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helpers.go
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package nfqueue
import (
"encoding/binary"
"unsafe"
"go.aporeto.io/netlink-go/common"
)
//GetPacketInfo -- Extract packet info from netlink response
//Returns mark,packetid and packet payload
//Mark is uint32
func GetPacketInfo(attr map[int]*common.NfAttrResponsePayload) (int, int, []byte) {
var packetID, mark int
if nfqaPacketHdr, ok := attr[int(NfqaPacketHdr)]; ok {
packetID = int(native.Uint32(nfqaPacketHdr.GetNetlinkData()))
}
if nfqaMark, ok := attr[int(NfqaMark)]; ok {
mark = int(binary.BigEndian.Uint32(nfqaMark.GetNetlinkData()))
}
if nfqaPayload, ok := attr[int(NfqaPayload)]; ok {
return packetID, mark, nfqaPayload.GetNetlinkData()
}
return packetID, mark, []byte{}
}
//ToWireFormat -- Convert NfqMsgVerdictHdr to byte slice
func (r *NfqMsgVerdictHdr) ToWireFormat() []byte {
buf := make([]byte, SizeofNfqMsgVerdictHdr)
binary.BigEndian.PutUint32(buf, r.verdict)
native.PutUint32(buf[4:], r.id)
return buf
}
//ToWireFormatBuf -- Convert structure to []byte and copy the []byte to passed buffer
func (r *NfqMsgVerdictHdr) ToWireFormatBuf(buf []byte) int {
binary.BigEndian.PutUint32(buf, r.verdict)
native.PutUint32(buf[4:], r.id)
return int(r.Length())
}
//Length -- return length of struct
func (r *NfqMsgVerdictHdr) Length() uint32 {
return SizeofNfqMsgVerdictHdr
}
//ToWireFormat -- Convert NfqMsgMarkHdr to byte slice
func (r *NfqMsgMarkHdr) ToWireFormat() []byte {
buf := make([]byte, 4)
binary.BigEndian.PutUint32(buf, r.mark)
return buf
}
//ToWireFormatBuf -- Convert struct to []byte and copy it passed buf
func (r *NfqMsgMarkHdr) ToWireFormatBuf(buf []byte) int {
binary.BigEndian.PutUint32(buf, r.mark)
return int(r.Length())
}
//Length -- Return length of struct
func (r *NfqMsgMarkHdr) Length() uint32 {
return uint32(unsafe.Sizeof(NfqMsgMarkHdr{}))
}
//ToWireFormat -- Convert NfqMsgConfigCommand to byte slice
func (r *NfqMsgConfigCommand) ToWireFormat() []byte {
buf := make([]byte, SizeofMsgConfigCommand)
buf[0] = byte(r.Command)
buf[1] = r._pad
binary.BigEndian.PutUint16(buf[2:], r.pf)
return buf
}
//Length -- Return length of struct
func (r *NfqMsgConfigCommand) Length() uint32 {
return uint32(unsafe.Sizeof(NfqMsgConfigCommand{}))
}
//ToWireFormat -- Convert NfqMsgConfigParams to byte slice
func (r *NfqMsgConfigParams) ToWireFormat() []byte {
buf := make([]byte, SizeOfNfqMsgConfigParams)
binary.BigEndian.PutUint32(buf, r.copyRange)
buf[4] = byte(r.copyMode)
return buf
}
//Length -- Return length of struct
func (r *NfqMsgConfigParams) Length() uint32 {
return uint32(unsafe.Sizeof(NfqMsgConfigParams{}))
}
//ToWireFormat -- Convert NfqMsgConfigQueueLen to byte slice
func (r *NfqMsgConfigQueueLen) ToWireFormat() []byte {
buf := make([]byte, SizeOfNfqMsgConfigQueueLen)
binary.BigEndian.PutUint32(buf, r.queueLen)
return buf
}
//Length -- Return length of struct
func (r *NfqMsgConfigQueueLen) Length() uint32 {
return uint32(unsafe.Sizeof(NfqMsgConfigQueueLen{}))
}
//ParseNfAttrResponse -- Parse the Nfattrresponse payload
// func ParseNfAttrResponse(element *NfAttrResponsePayload) (uint16, uint16, []byte) {
// return element.attr.nfaLen, element.attr.nfaType, element.data
// }
//QueueID return queueid
func QueueID(msg *common.NfqGenMsg) uint16 {
return msg.GetNfgenResID()
}