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-rw-r--r--src/gprs/gprs_gb_parse.c645
1 files changed, 0 insertions, 645 deletions
diff --git a/src/gprs/gprs_gb_parse.c b/src/gprs/gprs_gb_parse.c
deleted file mode 100644
index e5de4d4c7..000000000
--- a/src/gprs/gprs_gb_parse.c
+++ /dev/null
@@ -1,645 +0,0 @@
-/* GPRS Gb message parser */
-
-/* (C) 2014 by On-Waves
- * All Rights Reserved
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as published by
- * the Free Software Foundation; either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- *
- */
-
-#include <osmocom/gsm/gsm48.h>
-#include <osmocom/gsm/protocol/gsm_04_08_gprs.h>
-
-#include <osmocom/sgsn/gprs_gb_parse.h>
-
-#include <osmocom/sgsn/gprs_utils.h>
-
-#include <osmocom/sgsn/debug.h>
-
-#include <osmocom/gprs/gprs_bssgp.h>
-
-static int gprs_gb_parse_gmm_attach_req(uint8_t *data, size_t data_len,
- struct gprs_gb_parse_context *parse_ctx)
-{
- uint8_t *value;
- size_t value_len;
-
- parse_ctx->llc_msg_name = "ATTACH_REQ";
-
- /* Skip MS network capability */
- if (osmo_shift_lv(&data, &data_len, NULL, &value_len) <= 0 ||
- value_len < 1 || value_len > 8)
- /* invalid */
- return 0;
-
- /* Skip Attach type */
- /* Skip Ciphering key sequence number */
- /* Skip DRX parameter */
- if (osmo_shift_v_fixed(&data, &data_len, 3, NULL) < 3)
- return 0;
-
- /* Get Mobile identity */
- if (osmo_shift_lv(&data, &data_len, &value, &value_len) <= 0 ||
- value_len < 5 || value_len > 8)
- /* invalid */
- return 0;
-
- if (gprs_is_mi_tmsi(value, value_len)) {
- parse_ctx->ptmsi_enc = value + 1;
- } else if (gprs_is_mi_imsi(value, value_len)) {
- parse_ctx->imsi = value;
- parse_ctx->imsi_len = value_len;
- }
-
- if (osmo_shift_v_fixed(&data, &data_len, 6, &value) <= 0)
- return 0;
-
- parse_ctx->old_raid_enc = value;
-
- return 1;
-}
-
-static int gprs_gb_parse_gmm_attach_ack(uint8_t *data, size_t data_len,
- struct gprs_gb_parse_context *parse_ctx)
-{
- uint8_t *value;
- size_t value_len;
-
- parse_ctx->llc_msg_name = "ATTACH_ACK";
-
- /* Skip Attach result */
- /* Skip Force to standby */
- /* Skip Periodic RA update timer */
- /* Skip Radio priority for SMS */
- /* Skip Spare half octet */
- if (osmo_shift_v_fixed(&data, &data_len, 3, NULL) < 3)
- return 0;
-
- if (osmo_shift_v_fixed(&data, &data_len, 6, &value) <= 0)
- return 0;
-
- parse_ctx->raid_enc = value;
-
- /* Skip P-TMSI signature (P-TMSI signature, opt, TV, length 4) */
- osmo_match_shift_tv_fixed(&data, &data_len, GSM48_IE_GMM_PTMSI_SIG, 3, NULL);
-
- /* Skip Negotiated READY timer value (GPRS timer, opt, TV, length 2) */
- osmo_match_shift_tv_fixed(&data, &data_len, GSM48_IE_GMM_TIMER_READY, 1, NULL);
-
- /* Allocated P-TMSI (Mobile identity, opt, TLV, length 7) */
- if (osmo_match_shift_tlv(&data, &data_len, GSM48_IE_GMM_ALLOC_PTMSI,
- &value, &value_len) > 0 &&
- gprs_is_mi_tmsi(value, value_len))
- parse_ctx->new_ptmsi_enc = value + 1;
- return 1;
-}
-
-static int gprs_gb_parse_gmm_attach_rej(uint8_t *data, size_t data_len,
- struct gprs_gb_parse_context *parse_ctx)
-{
- uint8_t *value;
-
- parse_ctx->llc_msg_name = "ATTACH_REJ";
-
- /* GMM cause */
- if (osmo_shift_v_fixed(&data, &data_len, 1, &value) <= 0)
- return 0;
-
- parse_ctx->invalidate_tlli = 1;
-
- return 1;
-}
-
-
-static int gprs_gb_parse_gmm_detach_req(uint8_t *data, size_t data_len,
- struct gprs_gb_parse_context *parse_ctx)
-{
- uint8_t *value;
- size_t value_len;
- int detach_type;
- int power_off;
-
- parse_ctx->llc_msg_name = "DETACH_REQ";
-
- /* Skip spare half octet */
- /* Get Detach type */
- if (osmo_shift_v_fixed(&data, &data_len, 1, &value) <= 0)
- /* invalid */
- return 0;
-
- detach_type = *value & 0x07;
- power_off = *value & 0x08 ? 1 : 0;
-
- if (parse_ctx->to_bss) {
- /* Network originated */
- if (detach_type == GPRS_DET_T_MT_REATT_REQ)
- parse_ctx->await_reattach = 1;
- } else {
- /* Mobile originated */
-
- if (power_off)
- parse_ctx->invalidate_tlli = 1;
-
- /* Get P-TMSI (Mobile identity), see GSM 24.008, 9.4.5.2 */
- if (osmo_match_shift_tlv(&data, &data_len,
- GSM48_IE_GMM_ALLOC_PTMSI, &value, &value_len) > 0)
- {
- if (gprs_is_mi_tmsi(value, value_len))
- parse_ctx->ptmsi_enc = value + 1;
- }
- }
-
- return 1;
-}
-
-static int gprs_gb_parse_gmm_ra_upd_req(uint8_t *data, size_t data_len,
- struct gprs_gb_parse_context *parse_ctx)
-{
- uint8_t *value;
-
- parse_ctx->llc_msg_name = "RA_UPD_REQ";
-
- /* Skip Update type */
- /* Skip GPRS ciphering key sequence number */
- if (osmo_shift_v_fixed(&data, &data_len, 1, NULL) < 1)
- return 0;
-
- if (osmo_shift_v_fixed(&data, &data_len, 6, &value) <= 0)
- return 0;
-
- parse_ctx->old_raid_enc = value;
-
- return 1;
-}
-
-static int gprs_gb_parse_gmm_ra_upd_rej(uint8_t *data, size_t data_len,
- struct gprs_gb_parse_context *parse_ctx)
-{
- uint8_t *value;
- uint8_t cause;
- int force_standby;
-
- parse_ctx->llc_msg_name = "RA_UPD_REJ";
-
- /* GMM cause */
- if (osmo_shift_v_fixed(&data, &data_len, 1, &value) <= 0)
- return 0;
-
- cause = value[0];
-
- /* Force to standby, 1/2 */
- /* spare bits, 1/2 */
- if (osmo_shift_v_fixed(&data, &data_len, 1, &value) <= 0)
- return 0;
-
- force_standby = (value[0] & 0x07) == 0x01;
-
- if (cause == GMM_CAUSE_IMPL_DETACHED && !force_standby)
- parse_ctx->await_reattach = 1;
-
- parse_ctx->invalidate_tlli = 1;
-
- return 1;
-}
-
-static int gprs_gb_parse_gmm_ra_upd_ack(uint8_t *data, size_t data_len,
- struct gprs_gb_parse_context *parse_ctx)
-{
- uint8_t *value;
- size_t value_len;
-
- parse_ctx->llc_msg_name = "RA_UPD_ACK";
-
- /* Skip Force to standby */
- /* Skip Update result */
- /* Skip Periodic RA update timer */
- if (osmo_shift_v_fixed(&data, &data_len, 2, NULL) < 2)
- return 0;
-
- if (osmo_shift_v_fixed(&data, &data_len, 6, &value) <= 0)
- return 0;
-
- parse_ctx->raid_enc = value;
-
- /* Skip P-TMSI signature (P-TMSI signature, opt, TV, length 4) */
- osmo_match_shift_tv_fixed(&data, &data_len, GSM48_IE_GMM_PTMSI_SIG, 3, NULL);
-
- /* Allocated P-TMSI (Mobile identity, opt, TLV, length 7) */
- if (osmo_match_shift_tlv(&data, &data_len, GSM48_IE_GMM_ALLOC_PTMSI,
- &value, &value_len) > 0 &&
- gprs_is_mi_tmsi(value, value_len))
- parse_ctx->new_ptmsi_enc = value + 1;
-
- return 1;
-}
-
-static int gprs_gb_parse_gmm_ptmsi_reall_cmd(uint8_t *data, size_t data_len,
- struct gprs_gb_parse_context *parse_ctx)
-{
- uint8_t *value;
- size_t value_len;
-
- parse_ctx->llc_msg_name = "PTMSI_REALL_CMD";
-
- LOGP(DLLC, LOGL_NOTICE,
- "Got P-TMSI Reallocation Command which is not covered by unit tests yet.\n");
-
- /* Allocated P-TMSI */
- if (osmo_shift_lv(&data, &data_len, &value, &value_len) > 0 &&
- gprs_is_mi_tmsi(value, value_len))
- parse_ctx->new_ptmsi_enc = value + 1;
-
- if (osmo_shift_v_fixed(&data, &data_len, 6, &value) <= 0)
- return 0;
-
- parse_ctx->raid_enc = value;
-
- return 1;
-}
-
-static int gprs_gb_parse_gmm_id_resp(uint8_t *data, size_t data_len,
- struct gprs_gb_parse_context *parse_ctx)
-{
- uint8_t *value;
- size_t value_len;
-
- parse_ctx->llc_msg_name = "ID_RESP";
-
- /* Mobile identity, Mobile identity 10.5.1.4, M LV 2-10 */
- if (osmo_shift_lv(&data, &data_len, &value, &value_len) <= 0 ||
- value_len < 1 || value_len > 9)
- /* invalid */
- return 0;
-
- if (gprs_is_mi_tmsi(value, value_len)) {
- parse_ctx->ptmsi_enc = value + 1;
- } else if (gprs_is_mi_imsi(value, value_len)) {
- parse_ctx->imsi = value;
- parse_ctx->imsi_len = value_len;
- }
-
- return 1;
-}
-
-static int gprs_gb_parse_gsm_act_pdp_req(uint8_t *data, size_t data_len,
- struct gprs_gb_parse_context *parse_ctx)
-{
- ssize_t old_len;
- uint8_t *value;
- size_t value_len;
-
- parse_ctx->llc_msg_name = "ACT_PDP_REQ";
-
- /* Skip Requested NSAPI */
- /* Skip Requested LLC SAPI */
- if (osmo_shift_v_fixed(&data, &data_len, 2, NULL) < 2)
- return 0;
-
- /* Skip Requested QoS (support 04.08 and 24.008) */
- if (osmo_shift_lv(&data, &data_len, NULL, &value_len) <= 0 ||
- value_len < 4 || value_len > 14)
- /* invalid */
- return 0;
-
- /* Skip Requested PDP address */
- if (osmo_shift_lv(&data, &data_len, NULL, &value_len) <= 0 ||
- value_len < 2 || value_len > 18)
- /* invalid */
- return 0;
-
- /* Access point name */
- old_len = osmo_match_shift_tlv(&data, &data_len,
- GSM48_IE_GSM_APN, &value, &value_len);
-
- if (old_len > 0 && value_len >=1 && value_len <= 100) {
- parse_ctx->apn_ie = data - old_len;
- parse_ctx->apn_ie_len = old_len;
- }
-
- return 1;
-}
-
-int gprs_gb_parse_dtap(uint8_t *data, size_t data_len,
- struct gprs_gb_parse_context *parse_ctx)
-{
- struct gsm48_hdr *g48h;
- uint8_t pdisc;
- uint8_t msg_type;
-
- if (osmo_shift_v_fixed(&data, &data_len, sizeof(*g48h), (uint8_t **)&g48h) <= 0)
- return 0;
-
- parse_ctx->g48_hdr = g48h;
-
- pdisc = gsm48_hdr_pdisc(g48h);
- if (pdisc != GSM48_PDISC_MM_GPRS && pdisc != GSM48_PDISC_SM_GPRS)
- return 1;
-
- msg_type = gsm48_hdr_msg_type(g48h);
- switch (msg_type) {
- case GSM48_MT_GMM_ATTACH_REQ:
- return gprs_gb_parse_gmm_attach_req(data, data_len, parse_ctx);
-
- case GSM48_MT_GMM_ATTACH_REJ:
- return gprs_gb_parse_gmm_attach_rej(data, data_len, parse_ctx);
-
- case GSM48_MT_GMM_ATTACH_ACK:
- return gprs_gb_parse_gmm_attach_ack(data, data_len, parse_ctx);
-
- case GSM48_MT_GMM_RA_UPD_REQ:
- return gprs_gb_parse_gmm_ra_upd_req(data, data_len, parse_ctx);
-
- case GSM48_MT_GMM_RA_UPD_REJ:
- return gprs_gb_parse_gmm_ra_upd_rej(data, data_len, parse_ctx);
-
- case GSM48_MT_GMM_RA_UPD_ACK:
- return gprs_gb_parse_gmm_ra_upd_ack(data, data_len, parse_ctx);
-
- case GSM48_MT_GMM_PTMSI_REALL_CMD:
- return gprs_gb_parse_gmm_ptmsi_reall_cmd(data, data_len, parse_ctx);
-
- case GSM48_MT_GSM_ACT_PDP_REQ:
- return gprs_gb_parse_gsm_act_pdp_req(data, data_len, parse_ctx);
-
- case GSM48_MT_GMM_ID_RESP:
- return gprs_gb_parse_gmm_id_resp(data, data_len, parse_ctx);
-
- case GSM48_MT_GMM_DETACH_REQ:
- return gprs_gb_parse_gmm_detach_req(data, data_len, parse_ctx);
-
- case GSM48_MT_GMM_DETACH_ACK:
- parse_ctx->llc_msg_name = "DETACH_ACK";
- parse_ctx->invalidate_tlli = 1;
- break;
-
- case GSM48_MT_GSM_DEACT_PDP_REQ:
- parse_ctx->llc_msg_name = "DEACT_PDP_REQ";
- break;
-
- case GSM48_MT_GSM_DEACT_PDP_ACK:
- parse_ctx->llc_msg_name = "DEACT_PDP_ACK";
- break;
-
- default:
- LOGP(DLLC, LOGL_NOTICE,
- "Unhandled GSM 04.08 message type %s for protocol discriminator %s.\n",
- get_value_string(gprs_msgt_gmm_names, msg_type), get_value_string(gsm48_pdisc_names, pdisc));
- break;
- };
-
- return 1;
-}
-
-int gprs_gb_parse_llc(uint8_t *llc, size_t llc_len,
- struct gprs_gb_parse_context *parse_ctx)
-{
- struct gprs_llc_hdr_parsed *ghp = &parse_ctx->llc_hdr_parsed;
- int rc;
- int fcs;
-
- /* parse LLC */
- rc = gprs_llc_hdr_parse(ghp, llc, llc_len);
- gprs_llc_hdr_dump(ghp, NULL);
- if (rc != 0) {
- LOGP(DLLC, LOGL_NOTICE, "Error during LLC header parsing\n");
- return 0;
- }
-
- fcs = gprs_llc_fcs(llc, ghp->crc_length);
- LOGP(DLLC, LOGL_DEBUG, "Got LLC message, CRC: %06x (computed %06x)\n",
- ghp->fcs, fcs);
-
- if (!ghp->data)
- return 0;
-
- if (ghp->sapi != GPRS_SAPI_GMM)
- return 1;
-
- if (ghp->cmd != GPRS_LLC_UI)
- return 1;
-
- if (ghp->is_encrypted) {
- parse_ctx->need_decryption = 1;
- return 0;
- }
-
- return gprs_gb_parse_dtap(ghp->data, ghp->data_len, parse_ctx);
-}
-
-int gprs_gb_parse_bssgp(uint8_t *bssgp, size_t bssgp_len,
- struct gprs_gb_parse_context *parse_ctx)
-{
- struct bssgp_normal_hdr *bgph;
- struct bssgp_ud_hdr *budh = NULL;
- struct tlv_parsed *tp = &parse_ctx->bssgp_tp;
- uint8_t pdu_type;
- uint8_t *data;
- size_t data_len;
- int rc;
-
- if (bssgp_len < sizeof(struct bssgp_normal_hdr))
- return 0;
-
- bgph = (struct bssgp_normal_hdr *)bssgp;
- pdu_type = bgph->pdu_type;
-
- if (pdu_type == BSSGP_PDUT_UL_UNITDATA ||
- pdu_type == BSSGP_PDUT_DL_UNITDATA) {
- if (bssgp_len < sizeof(struct bssgp_ud_hdr))
- return 0;
- budh = (struct bssgp_ud_hdr *)bssgp;
- bgph = NULL;
- data = budh->data;
- data_len = bssgp_len - sizeof(*budh);
- } else {
- data = bgph->data;
- data_len = bssgp_len - sizeof(*bgph);
- }
-
- parse_ctx->pdu_type = pdu_type;
- parse_ctx->bud_hdr = budh;
- parse_ctx->bgp_hdr = bgph;
- parse_ctx->bssgp_data = data;
- parse_ctx->bssgp_data_len = data_len;
-
- if (bssgp_tlv_parse(tp, data, data_len) < 0)
- return 0;
-
- if (budh)
- parse_ctx->tlli_enc = (uint8_t *)&budh->tlli;
-
- if (TLVP_PRESENT(tp, BSSGP_IE_ROUTEING_AREA))
- parse_ctx->bssgp_raid_enc = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_ROUTEING_AREA);
-
- if (TLVP_PRESENT(tp, BSSGP_IE_CELL_ID))
- parse_ctx->bssgp_raid_enc = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_CELL_ID);
-
- if (TLVP_PRESENT(tp, BSSGP_IE_IMSI)) {
- parse_ctx->imsi = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_IMSI);
- parse_ctx->imsi_len = TLVP_LEN(tp, BSSGP_IE_IMSI);
- }
-
- if (TLVP_PRESENT(tp, BSSGP_IE_TLLI)) {
- if (parse_ctx->tlli_enc)
- /* This is TLLI old, don't confuse it with TLLI current */
- parse_ctx->old_tlli_enc = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_TLLI);
- else
- parse_ctx->tlli_enc = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_TLLI);
- }
-
- if (TLVP_PRESENT(tp, BSSGP_IE_TMSI) && pdu_type == BSSGP_PDUT_PAGING_PS)
- parse_ctx->bssgp_ptmsi_enc = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_TMSI);
-
- if (TLVP_PRESENT(tp, BSSGP_IE_LLC_PDU)) {
- uint8_t *llc = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_LLC_PDU);
- size_t llc_len = TLVP_LEN(tp, BSSGP_IE_LLC_PDU);
-
- rc = gprs_gb_parse_llc(llc, llc_len, parse_ctx);
- if (!rc)
- return 0;
-
- parse_ctx->llc = llc;
- parse_ctx->llc_len = llc_len;
- }
-
- if (parse_ctx->tlli_enc) {
- uint32_t tmp_tlli;
- memcpy(&tmp_tlli, parse_ctx->tlli_enc, sizeof(tmp_tlli));
- parse_ctx->tlli = ntohl(tmp_tlli);
- }
-
- if (parse_ctx->bssgp_raid_enc && parse_ctx->old_raid_enc &&
- memcmp(parse_ctx->bssgp_raid_enc, parse_ctx->old_raid_enc, 6) != 0)
- parse_ctx->old_raid_is_foreign = 1;
-
- return 1;
-}
-
-void gprs_gb_log_parse_context(int log_level,
- struct gprs_gb_parse_context *parse_ctx,
- const char *default_msg_name)
-{
- const char *msg_name;
- const char *sep = "";
-
- if (!parse_ctx->tlli_enc &&
- !parse_ctx->ptmsi_enc &&
- !parse_ctx->new_ptmsi_enc &&
- !parse_ctx->bssgp_ptmsi_enc &&
- !parse_ctx->imsi)
- return;
-
- msg_name = gprs_gb_message_name(parse_ctx, default_msg_name);
-
- if (parse_ctx->llc_msg_name)
- msg_name = parse_ctx->llc_msg_name;
-
- LOGP(DGPRS, log_level, "%s: Got", msg_name);
-
- if (parse_ctx->tlli_enc) {
- LOGPC(DGPRS, log_level, "%s TLLI %08x", sep, parse_ctx->tlli);
- sep = ",";
- }
-
- if (parse_ctx->old_tlli_enc) {
- LOGPC(DGPRS, log_level, "%s old TLLI %02x%02x%02x%02x", sep,
- parse_ctx->old_tlli_enc[0],
- parse_ctx->old_tlli_enc[1],
- parse_ctx->old_tlli_enc[2],
- parse_ctx->old_tlli_enc[3]);
- sep = ",";
- }
-
- if (parse_ctx->bssgp_raid_enc) {
- struct gprs_ra_id raid;
- gsm48_parse_ra(&raid, parse_ctx->bssgp_raid_enc);
- LOGPC(DGPRS, log_level, "%s BSSGP RAID %s", sep, osmo_rai_name(&raid));
- sep = ",";
- }
-
- if (parse_ctx->raid_enc) {
- struct gprs_ra_id raid;
- gsm48_parse_ra(&raid, parse_ctx->raid_enc);
- LOGPC(DGPRS, log_level, "%s RAID %s", sep, osmo_rai_name(&raid));
- sep = ",";
- }
-
- if (parse_ctx->old_raid_enc) {
- struct gprs_ra_id raid;
- gsm48_parse_ra(&raid, parse_ctx->old_raid_enc);
- LOGPC(DGPRS, log_level, "%s old RAID %s", sep, osmo_rai_name(&raid));
- sep = ",";
- }
-
- if (parse_ctx->bssgp_ptmsi_enc) {
- uint32_t ptmsi = GSM_RESERVED_TMSI;
- gprs_parse_tmsi(parse_ctx->bssgp_ptmsi_enc, &ptmsi);
- LOGPC(DGPRS, log_level, "%s BSSGP PTMSI %08x", sep, ptmsi);
- sep = ",";
- }
-
- if (parse_ctx->ptmsi_enc) {
- uint32_t ptmsi = GSM_RESERVED_TMSI;
- gprs_parse_tmsi(parse_ctx->ptmsi_enc, &ptmsi);
- LOGPC(DGPRS, log_level, "%s PTMSI %08x", sep, ptmsi);
- sep = ",";
- }
-
- if (parse_ctx->new_ptmsi_enc) {
- uint32_t new_ptmsi = GSM_RESERVED_TMSI;
- gprs_parse_tmsi(parse_ctx->new_ptmsi_enc, &new_ptmsi);
- LOGPC(DGPRS, log_level, "%s new PTMSI %08x", sep, new_ptmsi);
- sep = ",";
- }
-
- if (parse_ctx->imsi) {
- struct osmo_mobile_identity mi;
- if (osmo_mobile_identity_decode(&mi, parse_ctx->imsi, parse_ctx->imsi_len, false) == 0
- && mi.type == GSM_MI_TYPE_IMSI) {
- LOGPC(DGPRS, log_level, "%s IMSI %s", sep, mi.imsi);
- sep = ",";
- }
- }
- if (parse_ctx->invalidate_tlli) {
- LOGPC(DGPRS, log_level, "%s invalidate", sep);
- sep = ",";
- }
- if (parse_ctx->await_reattach) {
- LOGPC(DGPRS, log_level, "%s re-attach", sep);
- sep = ",";
- }
-
- LOGPC(DGPRS, log_level, "\n");
-}
-
-const char *gprs_gb_message_name(const struct gprs_gb_parse_context *parse_ctx,
- const char *default_msg_name)
-{
- if (parse_ctx->llc_msg_name)
- return parse_ctx->llc_msg_name;
-
- if (parse_ctx->g48_hdr)
- return "GMM";
-
- if (parse_ctx->llc)
- return "LLC";
-
- if (parse_ctx->bud_hdr)
- return "BSSGP-UNITDATA";
-
- if (parse_ctx->bgp_hdr)
- return "BSSGP";
-
- return "unknown";
-}