Bug #2735
Malformed RF RESource INDication
Start date:
12/11/2017
Due date:
% Done:
100%
Spec Reference:
Description
In wireshark 2.4.3 there's error when decoding RSL message:
Frame 90: 73 bytes on wire (584 bits), 73 bytes captured (584 bits) on interface 0
Linux cooked capture
Internet Protocol Version 4, Src: 10.9.1.105, Dst: 10.9.1.105
Transmission Control Protocol, Src Port: 40478, Dst Port: 3003, Seq: 105, Ack: 25, Len: 5
IPA protocol ip.access, type: RSL
Radio Signalling Link (RSL)
0001 000. = Message discriminator: TRX Management messages (8)
.... ...0 = T bit: Not considered transparent by BTS
.001 1001 = Message type: RF RESource INDication (0x19)
Resource Information IE
[Malformed Packet: RSL]
[Expert Info (Error/Malformed): Malformed Packet (Exception occurred)]
[Malformed Packet (Exception occurred)]
[Severity level: Error]
[Group: Malformed]
Found using latest OsmoBSC master and osmo-bts-virtual with attached configuration.
Related issues
History
#1 Updated by msuraev about 2 years ago
- Related to Bug #2711: wireshark claims SI 2ter is wrong added
#2 Updated by msuraev about 2 years ago
- Related to Bug #1635: RSL RELASE indication and other messages include L3 information added
#3 Updated by msuraev about 2 years ago
- Related to Bug #2336: RSL_IE_L3_INFO 16 bit length is wrong added
#4 Updated by pespin about 2 years ago
- Assignee set to pespin
#6 Updated by pespin about 2 years ago
At first glance, it seems it's not yet implemented:
/* 8.6.1 sending RF RESOURCE INDICATION */
int rsl_tx_rf_res(struct gsm_bts_trx *trx)
{
struct msgb *nmsg;
LOGP(DRSL, LOGL_INFO, "Tx RSL RF RESource INDication\n");
nmsg = rsl_msgb_alloc(sizeof(struct abis_rsl_common_hdr));
if (!nmsg)
return -ENOMEM;
// FIXME: add interference levels of TRX
rsl_trx_push_hdr(nmsg, RSL_MT_RF_RES_IND);
nmsg->trx = trx;
return abis_bts_rsl_sendmsg(nmsg);
}
At rx time:
static int abis_rsl_rx_trx(struct msgb *msg)
{
...
case RSL_MT_RF_RES_IND:
/* interference on idle channels of TRX */
//DEBUGP(DRSL, "%s RF Resource Indication\n", gsm_trx_name(sign_link->trx));
break;
...
We should at least fix the packet to contain a len=0 field at least.
#7 Updated by pespin about 2 years ago
- Status changed from New to Feedback
- % Done changed from 0 to 90
Fix provided in https://gerrit.osmocom.org/#/c/5273/
I'll create a new task to remember to implement the interference level information.
#8 Updated by pespin about 2 years ago
- Related to Feature #1569: Report RF interference levels as part of RF RESOURCE INDICATION added
#9 Updated by pespin about 2 years ago
- Status changed from Feedback to Resolved
- % Done changed from 90 to 100
#10 Updated by laforge almost 2 years ago
- Status changed from Resolved to Closed
