common

package
v0.0.2 Latest Latest
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 Go to latest Published: Jul 21, 2017 License: Apache-2.0 Imports: 6 Imported by: 16

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Constants

View Source 
const (
	// ConntrackTable Conntrack table
	// https://github.com/torvalds/linux/blob/master/include/uapi/linux/netfilter/nfnetlink.h -> #define NFNL_SUBSYS_CTNETLINK		 1
	ConntrackTable = 1
	// ConntrackExpectTable Conntrack expect table
	// https://github.com/torvalds/linux/blob/master/include/uapi/linux/netfilter/nfnetlink.h -> #define NFNL_SUBSYS_CTNETLINK_EXP 2
	ConntrackExpectTable = 2
)
View Source 
const (
	//NFQUEUESUBSYSID The netlink subsystem id for nfqueue
	NFQUEUESUBSYSID = 0x3
	//SOCKFAMILY  constant for AF_NETLINK
	SOCKFAMILY = syscall.AF_NETLINK
	//SolNetlink  costant for SOL_NETLINK
	SolNetlink = 270 /* syscall.SOL_NETLINK not defined */

	//NfqnlMsgPacket  packet from kernel to userspace
	NfqnlMsgPacket msgTypes = (NFQUEUESUBSYSID << 8) | 0
	//NfqnlMsgVerdict verdict from userspace to kernel
	NfqnlMsgVerdict msgTypes = (NFQUEUESUBSYSID << 8) | 1
	//NfqnlMsgConfig connect to a particular queue
	NfqnlMsgConfig msgTypes = (NFQUEUESUBSYSID << 8) | 2
	//NfqnlMsgVerdictBatch batch verdict from userspace to kernel
	NfqnlMsgVerdictBatch msgTypes = (NFQUEUESUBSYSID << 8) | 3

	//NFCTNL - Netfilter Conntrack Netink message types
	NfnlConntrackTable msgTypes = (ConntrackTable << 8) | IPCTNL_MSG_CT_NEW

	/*NlmFRequest -- It is request message. 	*/
	NlmFRequest NlmFlags = 0x1
	/*NlmFMulti -- Multipart message, terminated by NlMsgDone */
	NlmFMulti NlmFlags = 0x2
	/*NlmFAck -- Reply with ack, with zero or error code */
	NlmFAck NlmFlags = 0x4
	/*NlmFEcho -- Echo this request 		*/
	NlmFEcho NlmFlags = 0x8
	/*NlmFDumpintr --  Dump was inconsistent due to sequence change */
	NlmFDumpintr NlmFlags = 0x10
	/*NlmFDumpFiltered -- Dump was filtered as requested */
	NlmFDumpFiltered NlmFlags = 0x20

	//NfnlBuffSize -- Buffer size of socket
	NfnlBuffSize uint32 = (75 * 1024)
	//NFNetlinkV0 - netlink v0
	NFNetlinkV0 uint8 = 0
	//SizeofMsgConfigCommand -- Sizeof config command struct
	SizeofMsgConfigCommand = 0x4
	//SizeofNfGenMsg -- Sizeof nfgen msg struct
	SizeofNfGenMsg uint32 = 0x4
	//SizeofNfAttr -- Sizeof nfattr struct
	// This does not account for the size of the byte slice at the end
	SizeofNfAttr uint16 = 0x4
	//SizeOfNfqMsgConfigParams -- Sizeof NfqMsgConfigParams
	SizeOfNfqMsgConfigParams uint32 = uint32(unsafe.Sizeof(NfqMsgConfigParams{}))
	//SizeOfNfqMsgConfigQueueLen -- Sizeof NfqMsgConfigQueueLen
	SizeOfNfqMsgConfigQueueLen uint32 = uint32(unsafe.Sizeof(NfqMsgConfigQueueLen{}))
	//SizeofNfqMsgVerdictHdr -- Sizeof verdict hdr struct
	SizeofNfqMsgVerdictHdr uint32 = 0x8
	//SizeofNfqMsgMarkHdr -- sizeof mark hdr
	SizeofNfqMsgMarkHdr = 0x4
	//APUNSPEC -- PF_UNSPEC/AF_UNSPEC
	APUNSPEC uint8 = syscall.AF_UNSPEC

	//NlMsgNoop -- do nothing
	NlMsgNoop = 0x1 /* nothing.		*/
	//NlMsgError -- error message from netlink
	NlMsgError = 0x2 /* error		*/
	//NlMsgDone -- Multi part message done
	NlMsgDone = 0x3 /* end of a dump	*/
	//NlMsgOverrun -- Overrun of buffer
	NlMsgOverrun = 0x4 /* data lost		*/

	SizeOfValue8 uint8 = uint8(unsafe.Sizeof(NfValue8{}))

	SizeOfValue16 uint16 = uint16(unsafe.Sizeof(NfValue16{}))

	SizeOfValue32 uint32 = uint32(unsafe.Sizeof(NfValue32{}))
)
View Source 
const (
	IPCTNL_MSG_CT_NEW    = 0
	IPCTNL_MSG_CT_GET    = 1
	IPCTNL_MSG_CT_DELETE = 2
)

https://github.com/torvalds/linux/blob/master/include/uapi/linux/netfilter/nfnetlink_conntrack.h

View Source 
const (
	TCP_PROTO = 6
	UDP_PROTO = 17
)

For generic use

Variables

This section is empty.

Functions

func BuildNlMsgHeader 

func BuildNlMsgHeader(msgType msgTypes, msgFlags NlmFlags, len uint32) *syscall.NlMsghdr

BuildNlMsgHeader -- Build syscall.NlMsgHdr structure msgType: The message type to be send | SUBSYSID - 3 for us Len: Len of the payload including the sizeof nlmsghdr msgFlags: Request Flags

func GetNetlinkDataArray 

func GetNetlinkDataArray(index int, d *NfAttrSlice) []byte

func IP2int 

func IP2int(ip net.IP) uint32

IP2int converts net.IP to uint32

func Int2ip 

func Int2ip(nn uint32) net.IP

To convert uint32 to net.IP

func NativeEndian 

func NativeEndian() binary.ByteOrder

func NetlinkErrMessagetoStruct 

func NetlinkErrMessagetoStruct(buf []byte) (*syscall.NlMsghdr, *syscall.NlMsgerr)

NetlinkErrMessagetoStruct -- parse byte slice and return syscall.NlMsgerr

func NetlinkMessageToStruct 

func NetlinkMessageToStruct(buf []byte) (*syscall.NlMsghdr, []byte, error)

NetlinkMessageToStruct -- Convert netlink message byte slice to struct and payload

func NfaAlign 

func NfaAlign(len uint16) uint16

NfaAlign -- Align to 4 byte boundary

func NfaAlign32 

func NfaAlign32(len uint32) uint32

NfaAlign32 -- Align to 4 byte boundary

func NfaLength 

func NfaLength(len uint16) uint16

NfaLength -- adjust length to end on 4 byte multiple

func NlMsgAlign 

func NlMsgAlign(len uint32) uint32

NlMsgAlign -- Align to 4 byte boundary

func NlMsgLength 

func NlMsgLength(len uint32) uint32

NlMsgLength -- adjust length to end on 4 byte multiple

func NlMsgSpace 

func NlMsgSpace(len uint32) uint32

NlMsgSpace -- Space required to hold this message

func NlMsgSubsysID 

func NlMsgSubsysID(h *syscall.NlMsghdr) uint16

NlMsgSubsysID returns the subsystem id -- 3 for queue

func NlMsgType 

func NlMsgType(h *syscall.NlMsghdr) uint16

NlMsgType Returns the Messagetype

func SerializeNlMsgHdr 

func SerializeNlMsgHdr(hdr *syscall.NlMsghdr) []byte

SerializeNlMsgHdr -- Serialize syscall.NlMsgHdr to byte slice

func SerializeNlMsgHdrBuf 

func SerializeNlMsgHdrBuf(hdr *syscall.NlMsghdr, buf []byte) int

SerializeNlMsgHdrBuf -- Serialize into passed buffer and returns number of bytes copied

Types

type NfAttr 

type NfAttr struct {
	// contains filtered or unexported fields
}

NfAttr -- attr struct header nfaLen -- sizeof struct + payload nfaType -- nfaType

func BuildNfAttrMsg 

func BuildNfAttrMsg(attrType uint16, n *syscall.NlMsghdr, dataLen uint32) *NfAttr

BuildNfAttrMsg -- Build nfattr message length -- length of the attr payload -- unused attrType -- Type of attr being added data --- The actual data being added. We only use this to figure out the size of payload. The payload needs to be appended separately n -- syscall.NlMsgHdr adjust length after building the nfattr

func BuildNfAttrWithPaddingMsg 

func BuildNfAttrWithPaddingMsg(attrType uint16, dataLen int) *NfAttr

BuildNfAttrWithPaddingMsg -- Build nfattrWithPadding message attrType -- Type of attr which needs padding dataLen -- Length of the attribute

func BuildNfNestedAttrMsg 

func BuildNfNestedAttrMsg(attrType uint16, dataLen int) *NfAttr

BuildNfAttrMsg -- Build nfattr message attrType -- Type of attr being added dataLEn -- Length of the attribute

func (*NfAttr) GetNfaLen 

func (r *NfAttr) GetNfaLen() uint16

func (*NfAttr) GetNfaType 

func (r *NfAttr) GetNfaType() uint16

func (*NfAttr) Length 

func (r *NfAttr) Length() uint32

Length -- Return length of struct

func (*NfAttr) SetNfaLen 

func (r *NfAttr) SetNfaLen(l uint16)

func (*NfAttr) SetNfaType 

func (r *NfAttr) SetNfaType(t uint16)

func (*NfAttr) ToWireFormat 

func (r *NfAttr) ToWireFormat() []byte

ToWireFormat -- Convert NfAttr to byte slice

func (*NfAttr) ToWireFormatBuf 

func (r *NfAttr) ToWireFormatBuf(buf []byte) int

ToWireFormatBuf -- Convert struct to []byte and copy it to passed buffer

type NfAttrResponsePayload 

type NfAttrResponsePayload struct {
	// contains filtered or unexported fields
}

NfAttrResponsePayload -- Response of attr from netlink attr -- NfAttr data -- payload for response

func SetNetlinkData 

func SetNetlinkData(b uint32) *NfAttrResponsePayload

func (*NfAttrResponsePayload) GetNetlinkData 

func (d *NfAttrResponsePayload) GetNetlinkData() []byte

type NfAttrSlice 

type NfAttrSlice [nfqaMax]NfAttrResponsePayload

NfAttrSlice is an array of attributes

func NetlinkMessageToNfAttrStruct 

func NetlinkMessageToNfAttrStruct(buf []byte, hdr *NfAttrSlice) (*NfAttrSlice, []byte, error)

NetlinkMessageToNfAttrStruct -- Convert byte slice representing nfattr to nfattr struct slice

type NfValue16 

type NfValue16 struct {
	// contains filtered or unexported fields
}

NfValue16 -- uint16 type attribute structure value -- the value for a uint16 type attribute

func (*NfValue16) Get16Value 

func (r *NfValue16) Get16Value() uint16

func (*NfValue16) Length 

func (r *NfValue16) Length() uint16

Length -- Return length of struct

func (*NfValue16) Set16Value 

func (r *NfValue16) Set16Value(v uint16)

func (*NfValue16) ToWireFormat 

func (r *NfValue16) ToWireFormat() []byte

ToWireFormat -- Convert NfValue16 to byte slice

type NfValue32 

type NfValue32 struct {
	// contains filtered or unexported fields
}

NfValue32 -- uint32 type attribute structure value -- the value for a uint32 type attribute

func (*NfValue32) Get32Value 

func (r *NfValue32) Get32Value() uint32

func (*NfValue32) Length 

func (r *NfValue32) Length() uint32

Length -- Return length of struct

func (*NfValue32) Set32Value 

func (r *NfValue32) Set32Value(v uint32)

func (*NfValue32) ToWireFormat 

func (r *NfValue32) ToWireFormat() []byte

ToWireFormat -- Convert NfValue32 to byte slice

type NfValue8 

type NfValue8 struct {
	// contains filtered or unexported fields
}

NfValue8 -- uint8 type attribute structure value -- the value for a uint8 type attribute

func (*NfValue8) Get8Value 

func (r *NfValue8) Get8Value() uint8

func (*NfValue8) Length 

func (r *NfValue8) Length() uint8

Length -- Return length of struct

func (*NfValue8) Set8Value 

func (r *NfValue8) Set8Value(v uint8)

func (*NfValue8) ToWireFormat 

func (r *NfValue8) ToWireFormat() []byte

ToWireFormat -- Convert NfValue8 to byte slice

type NfqGenMsg 

type NfqGenMsg struct {
	// contains filtered or unexported fields
}

NfqGenMsg -- the nfgen msg structure nfGenFamily -- Family version -- netlink version resId -- queueNum in big endian format

func BuildNfgenMsg 

func BuildNfgenMsg(family int, version uint8, resID uint16, n *syscall.NlMsghdr) *NfqGenMsg

BuildNfgenMsg -- Build nfgen msg strcuure family -- SOCK FAMILY Version -- Version resId -- queuenum n - syscall.NlMsghdr to adjust length after adding nfgen

func NetlinkMessageToNfGenStruct 

func NetlinkMessageToNfGenStruct(buf []byte) (*NfqGenMsg, []byte, error)

NetlinkMessageToNfGenStruct -- Convert netlink byte slice to nfqgen msg structure

func (*NfqGenMsg) GetNfgenFamily 

func (nfg *NfqGenMsg) GetNfgenFamily() uint8

func (*NfqGenMsg) GetNfgenResID 

func (nfg *NfqGenMsg) GetNfgenResID() uint16

func (*NfqGenMsg) GetNfgenVersion 

func (nfg *NfqGenMsg) GetNfgenVersion() uint8

func (*NfqGenMsg) Length 

func (r *NfqGenMsg) Length() uint32

Length -- Return length of struct

func (*NfqGenMsg) ToWireFormat 

func (r *NfqGenMsg) ToWireFormat() []byte

ToWireFormat -- Convert NfqGenMsg to byte slice

func (*NfqGenMsg) ToWireFormatBuf 

func (r *NfqGenMsg) ToWireFormatBuf(buf []byte) int

ToWireFormatBuf -- Convert struct to []byte and copy it to passed buffer

type NfqMsgConfigCommand 

type NfqMsgConfigCommand struct {
	Command nfqConfigCommands
	// contains filtered or unexported fields
}

NfqMsgConfigCommand -- config command Command -- the config command pf -- family

type NfqMsgConfigParams 

type NfqMsgConfigParams struct {
	// contains filtered or unexported fields
}

NfqMsgConfigParams -- Config params copyRange -- Range of bytes to copy copyMode -- copyMode meta/none/packet

type NfqMsgConfigQueueLen 

type NfqMsgConfigQueueLen struct {
	// contains filtered or unexported fields
}

NfqMsgConfigQueueLen -- Queue length queueLen -- The length of queue

type NfqMsgMarkHdr 

type NfqMsgMarkHdr struct {
	// contains filtered or unexported fields
}

NfqMsgMarkHdr -- Mark Payload mark -- markval

type NfqMsgVerdictHdr 

type NfqMsgVerdictHdr struct {
	// contains filtered or unexported fields
}

NfqMsgVerdictHdr -- Verdict Hdr struct verdict -- accept/drop id -- packetid

type NfqNetlinkRequest 

type NfqNetlinkRequest struct {
	syscall.NlMsghdr
	Data []byte
}

NfqNetlinkRequest -- netlink request to send NlMsgHdr fields serialized data of structure passed to netlink

type NlmFlags 

type NlmFlags uint32

NlmFlags -- The flags passed to NlMsgHdr

type SockHandles 

type SockHandles struct {
	Syscalls syscallwrappers.Syscalls
	// contains filtered or unexported fields
}

NfqSockHandle -- Sock handle of netlink socket fd -- fd of socket rcvbufSize -- rcv buffer Size lsa -- local address

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