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V2 Netbird integration - UDP MIMO/SIMO, ICMPv6, DHCPv6 implementations (#106)
* begin adding udp.MuxHandler * add udp MuxHandlerSIMO/MIMO * add tcp rx shutdown * icmpv6 client * icmpv6 Client shared NDP/Echo preparation * icmpv6 client ndp/echo split * icmpv6 client ndp/echo split done * icmpv6 adjustments * add dhcpv6 stubs * dhcpv4 preliminary revision * add dns.NextLabel * dns label name tweaks * dns begin work on TCP client * add dnstcp package * apply gofmt changes * add udp mux tests * clean up, remove StackBig for now * remove dnstcp so as to merged confident parts and we continue dnstcp work elsewhere
This commit is contained in:
Pat Whittingslow
GitHub
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package dhcpv6
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import (
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"encoding/binary"
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"github.com/soypat/lneto"
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)
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// ClientState transition table during request:
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//
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// StateInit -> | Send out Solicit | -> StateSoliciting
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// StateSoliciting -> | Accept Advertise | -> StateRequesting
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// StateRequesting -> | Receive Reply | -> StateBound
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//go:generate stringer -type=MsgType,ClientState,OptCode,StatusCode,DUIDType -linecomment -output stringers.go
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const (
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// ClientPort is the UDP port DHCPv6 clients listen on.
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ClientPort = 546
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// ServerPort is the UDP port DHCPv6 servers listen on.
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ServerPort = 547
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// OptionsOffset is the byte offset where DHCPv6 options begin in a client-server message.
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// Layout: MsgType(1) + TransactionID(3).
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OptionsOffset = 4
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)
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// MsgType is the DHCPv6 message type (RFC 8415 §7.3).
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type MsgType uint8
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const (
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MsgSolicit MsgType = 1 // solicit
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MsgAdvertise MsgType = 2 // advertise
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MsgRequest MsgType = 3 // request
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MsgConfirm MsgType = 4 // confirm
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MsgRenew MsgType = 5 // renew
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MsgRebind MsgType = 6 // rebind
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MsgReply MsgType = 7 // reply
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MsgRelease MsgType = 8 // release
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MsgDecline MsgType = 9 // decline
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MsgReconfigure MsgType = 10 // reconfigure
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MsgInformRequest MsgType = 11 // inform-request
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MsgRelayForw MsgType = 12 // relay-forw
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MsgRelayRepl MsgType = 13 // relay-repl
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)
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// ClientState is the DHCPv6 client DORA state machine state.
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type ClientState uint8
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const (
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_ ClientState = iota
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StateInit // init
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StateSoliciting // soliciting
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StateRequesting // requesting
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StateBound // bound
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StateRenewing // renewing
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StateRebinding // rebinding
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)
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// HasIP returns true if the state indicates the Client has an IPv6 address assigned.
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func (s ClientState) HasIP() bool {
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return s == StateBound || s == StateRenewing || s == StateRebinding
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}
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// OptCode is a DHCPv6 option code (RFC 8415 §21), encoded as a 2-byte big-endian value.
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type OptCode uint16
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const (
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OptClientID OptCode = 1 // client-id
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OptServerID OptCode = 2 // server-id
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OptIANA OptCode = 3 // ia-na
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OptIATA OptCode = 4 // ia-ta
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OptIAAddr OptCode = 5 // iaaddr
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OptORO OptCode = 6 // oro
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OptPreference OptCode = 7 // preference
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OptElapsedTime OptCode = 8 // elapsed-time
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OptRelayMsg OptCode = 9 // relay-msg
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OptAuth OptCode = 11 // auth
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OptUnicast OptCode = 12 // unicast
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OptStatusCode OptCode = 13 // status-code
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OptRapidCommit OptCode = 14 // rapid-commit
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OptUserClass OptCode = 15 // user-class
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OptVendorClass OptCode = 16 // vendor-class
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OptVendorOpts OptCode = 17 // vendor-opts
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OptInterfaceID OptCode = 18 // interface-id
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OptReconfMsg OptCode = 19 // reconf-msg
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OptReconfAccept OptCode = 20 // reconf-accept
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OptDNSServers OptCode = 23 // dns-servers
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OptDomainList OptCode = 24 // domain-list
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OptIAPD OptCode = 25 // ia-pd
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OptIAPrefix OptCode = 26 // iaprefix
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OptNTPServer OptCode = 56 // ntp-server
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)
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// DUIDType is the DHCP Unique Identifier type (RFC 8415 §11).
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type DUIDType uint16
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const (
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DUIDTypeLLT DUIDType = 1 // duid-llt
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DUIDTypeEN DUIDType = 2 // duid-en
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DUIDTypeLL DUIDType = 3 // duid-ll
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)
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// StatusCode is the DHCPv6 status code value (RFC 8415 §21.13).
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type StatusCode uint16
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const (
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StatusSuccess StatusCode = 0 // success
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StatusUnspecFail StatusCode = 1 // unspec-fail
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StatusNoAddrsAvail StatusCode = 2 // no-addrs-avail
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StatusNoBinding StatusCode = 3 // no-binding
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StatusNotOnLink StatusCode = 4 // not-on-link
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StatusUseMulticast StatusCode = 5 // use-multicast
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)
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// EncodeOption writes a DHCPv6 TLV option into dst.
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// Format: code(2) + length(2) + data.
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func EncodeOption(dst []byte, code OptCode, data ...byte) (int, error) {
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if len(data) > 0xffff {
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return 0, lneto.ErrInvalidLengthField
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} else if len(dst) < 4+len(data) {
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return 0, lneto.ErrShortBuffer
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}
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binary.BigEndian.PutUint16(dst[0:2], uint16(code))
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binary.BigEndian.PutUint16(dst[2:4], uint16(len(data)))
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copy(dst[4:], data)
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return 4 + len(data), nil
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}
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// EncodeOption16 encodes a single uint16 value as a DHCPv6 option.
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func EncodeOption16(dst []byte, code OptCode, v uint16) (int, error) {
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return EncodeOption(dst, code, byte(v>>8), byte(v))
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}
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// EncodeOption32 encodes a single uint32 value as a DHCPv6 option.
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func EncodeOption32(dst []byte, code OptCode, v uint32) (int, error) {
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return EncodeOption(dst, code, byte(v>>24), byte(v>>16), byte(v>>8), byte(v))
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}
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// EncodeOptionIANA encodes an IA_NA option (RFC 8415 §21.4).
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// Layout: code(2) + len(2) + IAID(4) + T1(4) + T2(4) + subOpts.
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func EncodeOptionIANA(dst []byte, iaid [4]byte, t1, t2 uint32, subOpts []byte) (int, error) {
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const fixedLen = 12 // IAID(4) + T1(4) + T2(4)
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dataLen := fixedLen + len(subOpts)
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if len(dst) < 4+dataLen {
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return 0, lneto.ErrShortBuffer
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}
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binary.BigEndian.PutUint16(dst[0:2], uint16(OptIANA))
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binary.BigEndian.PutUint16(dst[2:4], uint16(dataLen))
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copy(dst[4:8], iaid[:])
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binary.BigEndian.PutUint32(dst[8:12], t1)
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binary.BigEndian.PutUint32(dst[12:16], t2)
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copy(dst[16:], subOpts)
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return 4 + dataLen, nil
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}
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// EncodeOptionIAAddr encodes an IAADDR option (RFC 8415 §21.6).
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// Layout: code(2) + len(2) + addr(16) + preferred(4) + valid(4).
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func EncodeOptionIAAddr(dst []byte, addr [16]byte, preferred, valid uint32) (int, error) {
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const dataLen = 24 // addr(16) + preferred(4) + valid(4)
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if len(dst) < 4+dataLen {
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return 0, lneto.ErrShortBuffer
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}
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binary.BigEndian.PutUint16(dst[0:2], uint16(OptIAAddr))
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binary.BigEndian.PutUint16(dst[2:4], dataLen)
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copy(dst[4:20], addr[:])
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binary.BigEndian.PutUint32(dst[20:24], preferred)
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binary.BigEndian.PutUint32(dst[24:28], valid)
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return 4 + dataLen, nil
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}
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// AppendDUIDLL appends a DUID-LL (type 3) for an Ethernet MAC to dst.
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// Format: DUIDType(2) + hwtype=1(2) + mac(6).
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func AppendDUIDLL(dst []byte, mac [6]byte) []byte {
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return append(dst,
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byte(DUIDTypeLL>>8), byte(DUIDTypeLL), // type 3
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0, 1, // hardware type 1 = Ethernet
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mac[0], mac[1], mac[2], mac[3], mac[4], mac[5],
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)
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}
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