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fix ethernet gateway addr not being set; add IPID field; hardware addr support of tap; better tap interface

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This commit is contained in:
soypat
2025-05-31 12:47:09 -03:00
parent 6c65764070
commit 0008791bd8
5 changed files with 187 additions and 43 deletions
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examples/stackbasic/main.go
+25 -24
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@@ -23,8 +23,6 @@ import (
)
const (
mtu = 2048
iface = "192.168.10.1/24"
stackIP = "192.168.10.2"
stackPort = 80
iss = 100
@@ -34,8 +32,10 @@ var stackHWAddr = [6]byte{0xc0, 0xff, 0xee, 0x00, 0xde, 0xad}
func main() {
ip := netip.MustParseAddr(stackIP)
iface := netip.MustParsePrefix(iface)
if !iface.Contains(ip) {
tap := ltesto.NewHTTPTapClient("http://127.0.0.1:7070")
ippfx := tap.IPPrefix()
if !ippfx.Contains(ip) {
log.Fatal("interface does not contain stack address")
}
addrPort := netip.AddrPortFrom(ip, stackPort)
@@ -44,26 +44,22 @@ func main() {
}))
slogger := logger{lg}
lStack, handler, err := NewEthernetTCPStack(stackHWAddr, addrPort, slogger)
gatewayMAC := tap.HardwareAddr6()
mtu := tap.MTU()
lStack, handler, err := NewEthernetTCPStack(stackHWAddr, gatewayMAC, addrPort, uint16(mtu), slogger)
if err != nil {
log.Fatal(err)
}
// h := &handler.H
// _ = h.AwaitingSynAck()
// _ = h.AwaitingSynResponse()
// _ = h.AwaitingSynSend()
// _ = h
err = handler.OpenListen(addrPort.Port(), iss)
if err != nil {
log.Fatal(err)
}
tap := ltesto.NewHTTPTapClient("http://127.0.0.1:7070")
defer tap.Close()
tap.ReadDiscard() // Discard all unread content.
fmt.Println("hosting server at ", addrPort.String())
var buf [mtu]byte
fmt.Println("hosting server at ", addrPort.String(), "over tap interface of mtu:", mtu, "prefix:", ippfx, "gateway:", net.HardwareAddr(gatewayMAC[:]).String())
buf := make([]byte, mtu)
var hdr httpraw.Header
for {
nread, err := tap.Read(buf[:])
@@ -114,12 +110,13 @@ func main() {
}
}
func NewEthernetTCPStack(mac [6]byte, ip netip.AddrPort, slogger logger) (*LinkStack, *internet.TCPConn, error) {
func NewEthernetTCPStack(ourMAC, gwMAC [6]byte, ip netip.AddrPort, mtu uint16, slogger logger) (*LinkStack, *internet.TCPConn, error) {
var err error
lStack := LinkStack{
logger: slogger,
mac: mac,
mac: ourMAC,
mtu: mtu,
gwmac: gwMAC,
}
var ipStack internet.StackBasic
@@ -161,7 +158,7 @@ func NewEthernetTCPStack(mac [6]byte, ip netip.AddrPort, slogger logger) (*LinkS
proto = ethernet.TypeIPv6
}
arphandler, err := arp.NewHandler(arp.HandlerConfig{
HardwareAddr: mac[:],
HardwareAddr: ourMAC[:],
ProtocolAddr: ip.Addr().AsSlice(),
MaxQueries: 4,
MaxPending: 4,
@@ -196,8 +193,9 @@ type handler struct {
type LinkStack struct {
handlers []handler
logger
mac [6]byte
mtu uint16
mac [6]byte
gwmac [6]byte
mtu uint16
}
func (ls *LinkStack) Register(h handler) error {
@@ -239,23 +237,26 @@ DROP:
}
func (ls *LinkStack) HandleEth(dst []byte) (n int, err error) {
if len(dst) < int(ls.mtu) {
mtu := ls.mtu
if len(dst) < int(mtu) {
return 0, io.ErrShortBuffer
}
efrm, err := ethernet.NewFrame(dst)
if err != nil {
return 0, err
}
copy(efrm.DestinationHardwareAddr()[:], ls.gwmac[:]) // default set the gateway.
for i := range ls.handlers {
h := &ls.handlers[i]
n, err = h.handle(dst[:ls.mtu], 14)
n, err = h.handle(dst[:mtu], 14)
if err != nil {
ls.error("handling", slog.String("proto", ethernet.Type(h.proto).String()), slog.String("err", err.Error()))
continue
}
if n > 0 {
// Found packet
efrm, _ := ethernet.NewFrame(dst[:14])
copy(efrm.DestinationHardwareAddr()[:], h.raddr)
*efrm.SourceHardwareAddr() = ls.mac
efrm.SetEtherType(ethernet.Type(h.proto))
return n + 14, nil
}
}