diff options
Diffstat (limited to 'epan')
| -rw-r--r-- | epan/dissectors/packet-gprs-llc.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/epan/dissectors/packet-gprs-llc.c b/epan/dissectors/packet-gprs-llc.c index fd159021a3..6fe1fd0984 100644 --- a/epan/dissectors/packet-gprs-llc.c +++ b/epan/dissectors/packet-gprs-llc.c @@ -95,6 +95,7 @@ static int hf_llcgprs_tom_rl = -1; static int hf_llcgprs_tom_pd = -1; static int hf_llcgprs_tom_header = -1; static int hf_llcgprs_tom_data = -1; +static int hf_llcgprs_dummy_ui = -1; /* Unnumbered Commands and Responses (U Frames) */ #define U_DM 0x01 @@ -451,6 +452,8 @@ llc_gprs_dissect_xid(tvbuff_t *tvb, packet_info *pinfo, proto_item *llcgprs_tree } } +/* shortest dummy UI command as per TS 44.064 Section 6.4.2.2 */ +static const guint8 dummy_ui_cmd[] = { 0x43, 0xc0, 0x01, 0x2b, 0x2b, 0x2b }; static int dissect_llcgprs(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) @@ -474,6 +477,12 @@ dissect_llcgprs(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data proto_tree *uinfo_tree = NULL; gboolean ciphered_ui_frame = FALSE; + if (!tvb_memeql(tvb, 0, dummy_ui_cmd, sizeof(dummy_ui_cmd))) { + proto_tree_add_boolean(tree, hf_llcgprs_dummy_ui, tvb, offset, + tvb_captured_length(tvb), TRUE); + return tvb_captured_length(tvb); + } + col_set_str(pinfo->cinfo, COL_PROTOCOL, "GPRS-LLC"); /* llc_data_length includes the header and the payload */ @@ -1305,6 +1314,10 @@ proto_register_llcgprs(void) { &hf_llcgprs_tom_data, { "TOM Message Capsule Byte", "llcgprs.tomdata", FT_UINT8, BASE_HEX, NULL, 0xFF, "tdb", HFILL }}, + + { &hf_llcgprs_dummy_ui, + { "Dummy UI Command", "llcgprs.dummy_ui", FT_BOOLEAN, BASE_NONE, + NULL, 0x00, NULL, HFILL }}, }; /* Setup protocol subtree array */ |