diff options
Diffstat (limited to 'test/packetimpact/testbench/layers.go')
| -rw-r--r-- | test/packetimpact/testbench/layers.go | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/test/packetimpact/testbench/layers.go b/test/packetimpact/testbench/layers.go index 49370377d..1b0e5b8fc 100644 --- a/test/packetimpact/testbench/layers.go +++ b/test/packetimpact/testbench/layers.go @@ -689,6 +689,7 @@ type TCP struct { WindowSize *uint16 Checksum *uint16 UrgentPointer *uint16 + Options []byte } func (l *TCP) String() string { @@ -697,7 +698,7 @@ func (l *TCP) String() string { // ToBytes implements Layer.ToBytes. func (l *TCP) ToBytes() ([]byte, error) { - b := make([]byte, header.TCPMinimumSize) + b := make([]byte, l.length()) h := header.TCP(b) if l.SrcPort != nil { h.SetSourcePort(*l.SrcPort) @@ -727,6 +728,8 @@ func (l *TCP) ToBytes() ([]byte, error) { if l.UrgentPointer != nil { h.SetUrgentPoiner(*l.UrgentPointer) } + copy(b[header.TCPMinimumSize:], l.Options) + header.AddTCPOptionPadding(b[header.TCPMinimumSize:], len(l.Options)) if l.Checksum != nil { h.SetChecksum(*l.Checksum) return h, nil @@ -811,6 +814,7 @@ func parseTCP(b []byte) (Layer, layerParser) { WindowSize: Uint16(h.WindowSize()), Checksum: Uint16(h.Checksum()), UrgentPointer: Uint16(h.UrgentPointer()), + Options: b[header.TCPMinimumSize:h.DataOffset()], } return &tcp, parsePayload } @@ -821,7 +825,12 @@ func (l *TCP) match(other Layer) bool { func (l *TCP) length() int { if l.DataOffset == nil { - return header.TCPMinimumSize + // TCP header including the options must end on a 32-bit + // boundary; the user could potentially give us a slice + // whose length is not a multiple of 4 bytes, so we have + // to do the alignment here. + optlen := (len(l.Options) + 3) & ^3 + return header.TCPMinimumSize + optlen } return int(*l.DataOffset) } |