soypat/lneto
1
0
Fork 0
mirror of https://github.com/soypat/lneto.git synced 2026-08-20 14:39:02 +00:00
Code Issues Packages Projects Releases 1 Wiki Activity

StackNode refactor: add offsetToIP argument to Encapsulate

Browse Source
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
Download Patch File Download Diff File Expand all files Collapse all files
internet/stack-ethernet.go
+8 -3
View File
@@ -92,9 +92,9 @@ DROP:
return lneto.ErrPacketDrop
}
func (ls *StackEthernet) Encapsulate(carrierData []byte, frameOffset int) (n int, err error) {
func (ls *StackEthernet) Encapsulate(carrierData []byte, offsetToIP, offsetToFrame int) (n int, err error) {
mtu := ls.mtu
dst := carrierData[frameOffset:]
dst := carrierData[offsetToFrame:]
if len(dst) < int(mtu) {
return 0, io.ErrShortBuffer
}
@@ -104,7 +104,12 @@ func (ls *StackEthernet) Encapsulate(carrierData []byte, frameOffset int) (n int
}
*efrm.DestinationHardwareAddr() = ls.gwmac
var h *node
h, n, err = ls.handlers.encapsulateAny(dst[:mtu], 14)
// Children (IP/ARP) start at offset 14 (after ethernet header).
// For IP: offsetToIP=14, offsetToFrame=14
// For ARP: offsetToIP=-1, offsetToFrame=14 (but ARP ignores offsetToIP)
// Clip carrierData to MTU to prevent writes beyond MTU limit.
mtuLimit := offsetToFrame + int(mtu)
h, n, err = ls.handlers.encapsulateAny(carrierData[:mtuLimit], offsetToFrame+14, offsetToFrame+14)
if n == 0 {
return n, err
}