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feature: ipv4 broadcast support and bugfix for reset connection reset of IPv4+IPv6 stacks (#139)

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* feature: ipv4 broadcast support

* stackip4 method receiver varname
This commit is contained in:
Pat Whittingslow
2026-06-24 16:54:41 -03:00
committed by GitHub
parent ef279863a9
commit a42f0b404c
4 changed files with 51 additions and 25 deletions
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internet/stack-ip4.go
+23 -12
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@@ -22,34 +22,35 @@ type StackIPv4 struct {
}
func (stackip4 *StackIPv4) Reset(vld *lneto.Validator, maxNodes int) error {
stackip4.connID++
stackip4.reset4(vld, maxNodes)
return nil
}
func (stackip *StackIPv4) ConnectionID() *uint64 {
return &stackip.connID
func (stackip4 *StackIPv4) ConnectionID() *uint64 {
return &stackip4.connID
}
func (stackip *StackIPv4) Protocol() uint64 {
func (stackip4 *StackIPv4) Protocol() uint64 {
return uint64(ethernet.TypeIPv4)
}
func (stackip *StackIPv4) LocalPort() uint16 { return 0 }
func (stackip4 *StackIPv4) LocalPort() uint16 { return 0 }
func (stackip *StackIPv4) SetLogger(logger *slog.Logger) {
stackip.stackip4.handlers.log = logger
func (stackip4 *StackIPv4) SetLogger(logger *slog.Logger) {
stackip4.stackip4.handlers.log = logger
}
func (stackip *StackIPv4) Demux(carrierData []byte, offset int) error {
func (stackip4 *StackIPv4) Demux(carrierData []byte, offset int) error {
debugLog("ip:demux")
return stackip.stackip4.demux4(carrierData, offset)
return stackip4.stackip4.demux4(carrierData, offset)
}
func (stackip *StackIPv4) Encapsulate(carrierData []byte, offsetToIP, offsetToFrame int) (n int, err error) {
func (stackip4 *StackIPv4) Encapsulate(carrierData []byte, offsetToIP, offsetToFrame int) (n int, err error) {
if offsetToFrame != offsetToIP {
return 0, lneto.ErrBug
}
return stackip.stackip4.encapsulate4(carrierData, offsetToIP)
return stackip4.stackip4.encapsulate4(carrierData, offsetToIP)
}
type stackip4 struct {
@@ -58,6 +59,7 @@ type stackip4 struct {
ipID uint16
ip4 [4]byte
acceptMulticast bool
acceptBroadcast bool
}
func (si4 *stackip4) reset4(vld *lneto.Validator, maxNodes int) {
@@ -86,6 +88,10 @@ func (si4 *stackip4) IsRegistered4(proto lneto.IPProto) bool {
func (si4 *stackip4) SetAcceptMulticast4(accept bool) {
si4.acceptMulticast = accept
}
func (si4 *stackip4) SetAcceptBroadcast4(accept bool) {
si4.acceptBroadcast = accept
}
func (si4 *stackip4) Addr4() [4]byte { return si4.ip4 }
func (si4 *stackip4) SetAddr4(ip4 [4]byte) {
si4.ip4 = ip4
@@ -100,8 +106,13 @@ func (si4 *stackip4) demux4(carrierData []byte, offset int) error {
return err
}
dst := ifrm.DestinationAddr()
if si4.ip4 != ([4]byte{}) && *dst != si4.ip4 {
if !si4.acceptMulticast || !internal.IsMulticastIPAddr(dst[:]) {
if si4.ip4 != ([4]byte{}) && *dst != si4.ip4 { // Accept all packets when IP zeroed.
switch {
case si4.acceptMulticast && ipv4.IsMulticast(*dst):
// accept multicast.
case si4.acceptBroadcast && ipv4.IsBroadcast(*dst):
// accept broadcast.
default:
si4.handlers.debug("ip:not-for-us")
return lneto.ErrPacketDrop // Not meant for us.
}