|
|
|---|
| 322 |
p->AddHeader (llc); |
322 |
p->AddHeader (llc); |
| 323 |
// |
323 |
// |
|
|
324 |
// This corresponds to the length interpretation of the lengthType field, |
| 325 |
// but with an LLC/SNAP header added to the payload as in IEEE 802.2 |
| 326 |
// |
| 327 |
lengthType = p->GetSize (); |
| 328 |
|
| 329 |
// |
| 324 |
// All Ethernet frames must carry a minimum payload of 46 bytes. The |
330 |
// All Ethernet frames must carry a minimum payload of 46 bytes. The |
| 325 |
// LLC SNAP header counts as part of this payload. We need to padd out |
331 |
// LLC SNAP header counts as part of this payload. We need to padd out |
| 326 |
// if we don't have enough bytes. These must be real bytes since they |
332 |
// if we don't have enough bytes. These must be real bytes since they |
|
|
|---|
| 335 |
p->AddAtEnd (padd); |
341 |
p->AddAtEnd (padd); |
| 336 |
} |
342 |
} |
| 337 |
// |
343 |
NS_ASSERT_MSG (p->GetSize () <= GetMtu (), |
| 338 |
// This corresponds to the length interpretation of the lengthType field, |
|
|
| 339 |
// but with an LLC/SNAP header added to the payload as in IEEE 802.2 |
| 340 |
// |
| 341 |
lengthType = p->GetSize (); |
| 342 |
NS_ASSERT_MSG (lengthType <= GetMtu (), |
| 343 |
"CsmaNetDevice::AddHeader(): 802.3 Length/Type field with LLC/SNAP: " |
344 |
"CsmaNetDevice::AddHeader(): 802.3 Length/Type field with LLC/SNAP: " |
| 344 |
"length interpretation must not exceed device frame size minus overhead"); |
345 |
"length interpretation must not exceed device frame size minus overhead"); |
| 345 |
} |
346 |
} |
|
|
|---|
| 721 |
// |
722 |
// |
| 722 |
if (header.GetLengthType () <= 1500) |
723 |
if (header.GetLengthType () <= 1500) |
| 723 |
{ |
724 |
{ |
|
|
725 |
NS_ASSERT (packet->GetSize () >= header.GetLengthType ()); |
| 726 |
uint32_t padlen = packet->GetSize () - header.GetLengthType (); |
| 727 |
NS_ASSERT (padlen <= 46); |
| 728 |
if (padlen > 0) |
| 729 |
{ |
| 730 |
packet->RemoveAtEnd (padlen); |
| 731 |
} |
| 732 |
|
| 724 |
LlcSnapHeader llc; |
733 |
LlcSnapHeader llc; |
| 725 |
packet->RemoveHeader (llc); |
734 |
packet->RemoveHeader (llc); |
| 726 |
protocol = llc.GetType (); |
735 |
protocol = llc.GetType (); |