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stuff

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This commit is contained in:
JackDoan
2026-04-20 11:57:48 -05:00
parent f34e8fe0e6
commit f4907b6634
3 changed files with 27 additions and 33 deletions
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31
tcp_coalesce.go
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@@ -1,6 +1,7 @@
package nebula
import (
"bytes"
"encoding/binary"
"io"
@@ -392,55 +393,43 @@ func headersMatch(a, b []byte, isV6 bool, ipHdrLen int) bool {
if isV6 {
// IPv6: bytes [0:4] = version/TC/flow-label, [6:8] = next_hdr/hop,
// [8:40] = src+dst. Skip [4:6] payload length.
if !bytesEq(a[0:4], b[0:4]) {
if !bytes.Equal(a[0:4], b[0:4]) {
return false
}
if !bytesEq(a[6:40], b[6:40]) {
if !bytes.Equal(a[6:40], b[6:40]) {
return false
}
} else {
// IPv4: [0:2] version/IHL/TOS, [6:10] flags/fragoff/TTL/proto,
// [12:20] src+dst. Skip [2:4] total len, [4:6] id, [10:12] csum.
if !bytesEq(a[0:2], b[0:2]) {
if !bytes.Equal(a[0:2], b[0:2]) {
return false
}
if !bytesEq(a[6:10], b[6:10]) {
if !bytes.Equal(a[6:10], b[6:10]) {
return false
}
if !bytesEq(a[12:20], b[12:20]) {
if !bytes.Equal(a[12:20], b[12:20]) {
return false
}
}
// TCP: compare [0:4] ports, [8:13] ack+dataoff, [14:16] window,
// [18:tcpHdrLen] options (incl. urgent).
tcp := ipHdrLen
if !bytesEq(a[tcp:tcp+4], b[tcp:tcp+4]) {
if !bytes.Equal(a[tcp:tcp+4], b[tcp:tcp+4]) {
return false
}
if !bytesEq(a[tcp+8:tcp+13], b[tcp+8:tcp+13]) {
if !bytes.Equal(a[tcp+8:tcp+13], b[tcp+8:tcp+13]) {
return false
}
if !bytesEq(a[tcp+14:tcp+16], b[tcp+14:tcp+16]) {
if !bytes.Equal(a[tcp+14:tcp+16], b[tcp+14:tcp+16]) {
return false
}
if !bytesEq(a[tcp+18:], b[tcp+18:]) {
if !bytes.Equal(a[tcp+18:], b[tcp+18:]) {
return false
}
return true
}
func bytesEq(a, b []byte) bool {
if len(a) != len(b) {
return false
}
for i := range a {
if a[i] != b[i] {
return false
}
}
return true
}
// ipv4HdrChecksum computes the IPv4 header checksum over hdr (which must
// already have its checksum field zeroed) and returns the folded/inverted
// 16-bit value to store.