forked from osmocom/wireshark
UMTS RLC: add expert info for unknown / missing UDP framing tags
Change-Id: I29dbeaf0d90bab4c10b4674bfa983f7f5f26027b Reviewed-on: https://code.wireshark.org/review/26909 Reviewed-by: Pascal Quantin <pascal.quantin@gmail.com>
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@ -144,6 +144,8 @@ static expert_field ei_rlc_header_only = EI_INIT;
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static expert_field ei_rlc_ciphered_data = EI_INIT;
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static expert_field ei_rlc_no_per_frame_data = EI_INIT;
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static expert_field ei_rlc_incomplete_sequence = EI_INIT;
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static expert_field ei_rlc_unknown_udp_framing_tag = EI_INIT;
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static expert_field ei_rlc_missing_udp_framing_tag = EI_INIT;
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static dissector_handle_t ip_handle;
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static dissector_handle_t rrc_handle;
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@ -2641,6 +2643,19 @@ dissect_rlc_dch_unknown(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, voi
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return tvb_captured_length(tvb);
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}
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static void
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report_heur_error(proto_tree *tree, packet_info *pinfo, expert_field *eiindex,
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tvbuff_t *tvb, gint start, gint length)
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{
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proto_item *ti;
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proto_tree *subtree;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "RLC");
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col_clear(pinfo->cinfo, COL_INFO);
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ti = proto_tree_add_item(tree, proto_umts_rlc, tvb, 0, -1, ENC_NA);
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subtree = proto_item_add_subtree(ti, ett_rlc);
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proto_tree_add_expert(subtree, pinfo, eiindex, tvb, start, length);
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}
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/* Heuristic dissector looks for supported framing protocol (see wiki page) */
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static gboolean
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@ -2739,13 +2754,15 @@ dissect_rlc_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data
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continue;
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default:
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/* It must be a recognised tag */
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return FALSE;
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report_heur_error(tree, pinfo, &ei_rlc_unknown_udp_framing_tag, tvb, offset-1, 1);
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return TRUE;
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}
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}
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if ((channelTypePresent == FALSE) && (rlcModePresent == FALSE)) {
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/* Conditional fields are missing */
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return FALSE;
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report_heur_error(tree, pinfo, &ei_rlc_missing_udp_framing_tag, tvb, 0, offset);
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return TRUE;
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}
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/* Store info in packet if needed */
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@ -3022,6 +3039,8 @@ proto_register_rlc(void)
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{ &ei_rlc_ciphered_data, { "rlc.ciphered_data", PI_UNDECODED, PI_WARN, "Cannot dissect RLC frame because it is ciphered", EXPFILL }},
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{ &ei_rlc_no_per_frame_data, { "rlc.no_per_frame_data", PI_PROTOCOL, PI_WARN, "Can't dissect RLC frame because no per-frame info was attached!", EXPFILL }},
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{ &ei_rlc_incomplete_sequence, { "rlc.incomplete_sequence", PI_MALFORMED, PI_ERROR, "Error: Incomplete sequence", EXPFILL }},
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{ &ei_rlc_unknown_udp_framing_tag, { "rlc.unknown_udp_framing_tag", PI_UNDECODED, PI_WARN, "Unknown UDP framing tag, aborting dissection", EXPFILL }},
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{ &ei_rlc_missing_udp_framing_tag, { "rlc.missing_udp_framing_tag", PI_UNDECODED, PI_WARN, "Missing UDP framing conditional tag, aborting dissection", EXPFILL }}
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};
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proto_umts_rlc = proto_register_protocol("Radio Link Control", "RLC", "rlc");
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