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GTP: Don't include padding in the RAC in ULI 

From 3GPP TS 29.06 V 17.1.0 7.7.51:
The routing area code consists of 2 octets and is found in octet 10
and octet 11. Only the first octet (10) contains the RAC and the
second octet (11) is coded as "11111111".

Don't include the spare octet 11 in the RAC field. The RAC is only
one octet.
This commit is contained in:
John Thacker 2022-01-21 08:49:36 -05:00
parent 56f1ee5c3a
commit b2f78b47b4
1 changed files with 6 additions and 2 deletions
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8
epan/dissectors/packet-gtp.c
View File

@ -6755,12 +6755,16 @@ dissect_gtp_uli(tvbuff_t * tvb, int offset, packet_info * pinfo, proto_tree * tr
* Area Identification (RAI) of where the user currently is
* registered. RAI is defined in sub-clause 4.2 of 3GPP TS 23.003
* [2].
*
* The routing area code consists of 2 octets and is found in octet
* 10 and octet 11. Only the first octet (10) contains the RAC and
* the second octet (11) is coded as "11111111".
*/
dissect_e212_mcc_mnc(tvb, pinfo, tree, offset, E212_RAI, TRUE);
offset+=3;
proto_tree_add_item(tree, hf_gtp_lac, tvb, offset, 2, ENC_BIG_ENDIAN);
offset+=2;
proto_tree_add_item(tree, hf_gtp_rai_rac, tvb, offset, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(tree, hf_gtp_rai_rac, tvb, offset, 1, ENC_BIG_ENDIAN);
break;
default:
expert_add_info(pinfo, ti, &ei_gtp_ext_geo_loc_type);
@ -10780,7 +10784,7 @@ proto_register_gtp(void)
},
{&hf_gtp_rai_rac,
{ "Routing Area Code (RAC)", "gtp.rai_rac",
FT_UINT16, BASE_DEC, NULL, 0,
FT_UINT8, BASE_DEC, NULL, 0,
NULL, HFILL}
},
{&hf_gtp_lac,