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StackNode refactor: add offsetToIP argument to Encapsulate

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This commit is contained in:
Patricio Whittingslow
2025-12-19 00:38:28 -03:00
parent eaa36a589a
commit 1554b89a08
22 changed files with 180 additions and 94 deletions
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internet/stack-ip.go
+5 -3
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@@ -140,8 +140,8 @@ func (sb *StackIP) Demux(carrierData []byte, offset int) error {
return err
}
func (sb *StackIP) Encapsulate(carrierData []byte, frameOffset int) (int, error) {
frame := carrierData[frameOffset:]
func (sb *StackIP) Encapsulate(carrierData []byte, offsetToIP, offsetToFrame int) (int, error) {
frame := carrierData[offsetToFrame:]
if len(frame) < 256 {
return 0, io.ErrShortBuffer
}
@@ -158,7 +158,9 @@ func (sb *StackIP) Encapsulate(carrierData []byte, frameOffset int) (int, error)
ifrm.SetTTL(64)
*ifrm.SourceAddr() = sb.ip
sb.ipID = id
node, n, err := sb.handlers.encapsulateAny(frame, headerlen)
// Children (TCP/UDP) start at offset headerlen (20 bytes after IP header start).
// offsetToIP is 0 relative to this slice (frame), children's frame starts at headerlen.
node, n, err := sb.handlers.encapsulateAny(carrierData, offsetToFrame, offsetToFrame+headerlen)
if n == 0 {
return n, err
}