diff options
Diffstat (limited to 'openbsc/src/gprs/gprs_gsup_messages.c')
-rw-r--r-- | openbsc/src/gprs/gprs_gsup_messages.c | 419 |
1 files changed, 0 insertions, 419 deletions
diff --git a/openbsc/src/gprs/gprs_gsup_messages.c b/openbsc/src/gprs/gprs_gsup_messages.c deleted file mode 100644 index 07485f7f9..000000000 --- a/openbsc/src/gprs/gprs_gsup_messages.c +++ /dev/null @@ -1,419 +0,0 @@ -/* GPRS Subscriber Update Protocol message encoder/decoder */ - -/* - * (C) 2014 by Sysmocom s.f.m.c. GmbH - * (C) 2015 by Holger Hans Peter Freyther - * All Rights Reserved - * - * Author: Jacob Erlbeck - * - * 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 <openbsc/gprs_gsup_messages.h> - -#include <openbsc/debug.h> -#include <openbsc/gprs_utils.h> -#include <openbsc/utils.h> - -#include <osmocom/gsm/tlv.h> -#include <osmocom/core/msgb.h> - -#include <stdint.h> - -static int decode_pdp_info(uint8_t *data, size_t data_len, - struct gprs_gsup_pdp_info *pdp_info) -{ - int rc; - uint8_t tag; - uint8_t *value; - size_t value_len; - - /* specific parts */ - while (data_len > 0) { - enum gprs_gsup_iei iei; - - rc = gprs_shift_tlv(&data, &data_len, &tag, &value, &value_len); - if (rc < 0) - return -GMM_CAUSE_PROTO_ERR_UNSPEC; - - iei = tag; - - switch (iei) { - case GPRS_GSUP_PDP_CONTEXT_ID_IE: - pdp_info->context_id = decode_big_endian(value, value_len); - break; - - case GPRS_GSUP_PDP_TYPE_IE: - pdp_info->pdp_type = - decode_big_endian(value, value_len) & 0x0fff; - break; - - case GPRS_GSUP_ACCESS_POINT_NAME_IE: - pdp_info->apn_enc = value; - pdp_info->apn_enc_len = value_len; - break; - - case GPRS_GSUP_PDP_QOS_IE: - pdp_info->qos_enc = value; - pdp_info->qos_enc_len = value_len; - break; - - default: - LOGP(DGPRS, LOGL_ERROR, - "GSUP IE type %d not expected in PDP info\n", iei); - continue; - } - } - - return 0; -} - -static int decode_auth_info(uint8_t *data, size_t data_len, - struct gsm_auth_tuple *auth_tuple) -{ - int rc; - uint8_t tag; - uint8_t *value; - size_t value_len; - enum gprs_gsup_iei iei; - - /* specific parts */ - while (data_len > 0) { - rc = gprs_shift_tlv(&data, &data_len, &tag, &value, &value_len); - if (rc < 0) - return -GMM_CAUSE_PROTO_ERR_UNSPEC; - - iei = tag; - - switch (iei) { - case GPRS_GSUP_RAND_IE: - if (value_len != sizeof(auth_tuple->rand)) - goto parse_error; - - memcpy(auth_tuple->rand, value, value_len); - break; - - case GPRS_GSUP_SRES_IE: - if (value_len != sizeof(auth_tuple->sres)) - goto parse_error; - - memcpy(auth_tuple->sres, value, value_len); - break; - - case GPRS_GSUP_KC_IE: - if (value_len != sizeof(auth_tuple->kc)) - goto parse_error; - - memcpy(auth_tuple->kc, value, value_len); - break; - - default: - LOGP(DGPRS, LOGL_ERROR, - "GSUP IE type %d not expected in PDP info\n", iei); - continue; - } - } - - return 0; - -parse_error: - LOGP(DGPRS, LOGL_ERROR, - "GSUP IE type %d, length %zu invalid in PDP info\n", iei, value_len); - - return -1; -} - -int gprs_gsup_decode(const uint8_t *const_data, size_t data_len, - struct gprs_gsup_message *gsup_msg) -{ - int rc; - uint8_t tag; - /* the shift/match functions expect non-const pointers, but we'll - * either copy the data or cast pointers back to const before returning - * them - */ - uint8_t *data = (uint8_t *)const_data; - uint8_t *value; - size_t value_len; - static const struct gprs_gsup_pdp_info empty_pdp_info = {0}; - static const struct gsm_auth_tuple empty_auth_info = {0}; - static const struct gprs_gsup_message empty_gsup_message = {0}; - - *gsup_msg = empty_gsup_message; - - /* generic part */ - rc = gprs_shift_v_fixed(&data, &data_len, 1, &value); - if (rc < 0) - return -GMM_CAUSE_INV_MAND_INFO; - - gsup_msg->message_type = decode_big_endian(value, 1); - - rc = gprs_match_tlv(&data, &data_len, GPRS_GSUP_IMSI_IE, - &value, &value_len); - - if (rc <= 0) - return -GMM_CAUSE_INV_MAND_INFO; - - if (value_len * 2 + 1 > sizeof(gsup_msg->imsi)) - return -GMM_CAUSE_INV_MAND_INFO; - - /* Note that gsm48_decode_bcd_number expects the number of encoded IMSI - * octets in the first octet. By coincidence (the TLV encoding) the byte - * before the value part already contains this length so we can use it - * here. - */ - OSMO_ASSERT(value[-1] == value_len); - gsm48_decode_bcd_number(gsup_msg->imsi, sizeof(gsup_msg->imsi), - value - 1, 0); - - /* specific parts */ - while (data_len > 0) { - enum gprs_gsup_iei iei; - struct gprs_gsup_pdp_info pdp_info; - struct gsm_auth_tuple auth_info; - - rc = gprs_shift_tlv(&data, &data_len, &tag, &value, &value_len); - if (rc < 0) - return -GMM_CAUSE_PROTO_ERR_UNSPEC; - - iei = tag; - - switch (iei) { - case GPRS_GSUP_IMSI_IE: - case GPRS_GSUP_PDP_TYPE_IE: - case GPRS_GSUP_ACCESS_POINT_NAME_IE: - case GPRS_GSUP_RAND_IE: - case GPRS_GSUP_SRES_IE: - case GPRS_GSUP_KC_IE: - LOGP(DGPRS, LOGL_NOTICE, - "GSUP IE type %d not expected (ignored)\n", iei); - continue; - - case GPRS_GSUP_CAUSE_IE: - gsup_msg->cause = decode_big_endian(value, value_len); - break; - - case GPRS_GSUP_CANCEL_TYPE_IE: - gsup_msg->cancel_type = - decode_big_endian(value, value_len) + 1; - break; - - case GPRS_GSUP_PDP_INFO_COMPL_IE: - gsup_msg->pdp_info_compl = 1; - break; - - case GPRS_GSUP_FREEZE_PTMSI_IE: - gsup_msg->freeze_ptmsi = 1; - break; - - case GPRS_GSUP_PDP_CONTEXT_ID_IE: - /* When these IE appear in the top-level part of the - * message, they are used by Delete Subscr Info to delete - * single entries. We don't have an extra list for - * these but use the PDP info list instead */ - - /* fall through */ - - case GPRS_GSUP_PDP_INFO_IE: - if (gsup_msg->num_pdp_infos >= GPRS_GSUP_MAX_NUM_PDP_INFO) { - LOGP(DGPRS, LOGL_ERROR, - "GSUP IE type %d (PDP_INFO) max exceeded\n", - iei); - return -GMM_CAUSE_COND_IE_ERR; - } - - pdp_info = empty_pdp_info; - - if (iei == GPRS_GSUP_PDP_INFO_IE) { - rc = decode_pdp_info(value, value_len, &pdp_info); - if (rc < 0) - return rc; - pdp_info.have_info = 1; - } else { - pdp_info.context_id = - decode_big_endian(value, value_len); - } - - gsup_msg->pdp_infos[gsup_msg->num_pdp_infos++] = - pdp_info; - break; - - case GPRS_GSUP_AUTH_TUPLE_IE: - if (gsup_msg->num_auth_tuples >= GPRS_GSUP_MAX_NUM_AUTH_INFO) { - LOGP(DGPRS, LOGL_ERROR, - "GSUP IE type %d (AUTH_INFO) max exceeded\n", - iei); - return -GMM_CAUSE_INV_MAND_INFO; - } - - auth_info = empty_auth_info; - auth_info.key_seq = gsup_msg->num_auth_tuples; - - rc = decode_auth_info(value, value_len, &auth_info); - if (rc < 0) - return rc; - - gsup_msg->auth_tuples[gsup_msg->num_auth_tuples++] = - auth_info; - break; - - case GPRS_GSUP_MSISDN_IE: - gsup_msg->msisdn_enc = value; - gsup_msg->msisdn_enc_len = value_len; - break; - - case GPRS_GSUP_HLR_NUMBER_IE: - gsup_msg->hlr_enc = value; - gsup_msg->hlr_enc_len = value_len; - break; - - default: - LOGP(DGPRS, LOGL_NOTICE, - "GSUP IE type %d unknown\n", iei); - continue; - } - } - - return 0; -} - -static void encode_pdp_info(struct msgb *msg, enum gprs_gsup_iei iei, - const struct gprs_gsup_pdp_info *pdp_info) -{ - uint8_t *len_field; - size_t old_len; - uint8_t u8; - - len_field = msgb_tlv_put(msg, iei, 0, NULL) - 1; - old_len = msgb_length(msg); - - u8 = pdp_info->context_id; - msgb_tlv_put(msg, GPRS_GSUP_PDP_CONTEXT_ID_IE, sizeof(u8), &u8); - - if (pdp_info->pdp_type) { - msgb_tlv_put(msg, GPRS_GSUP_PDP_TYPE_IE, - GPRS_GSUP_PDP_TYPE_SIZE, - encode_big_endian(pdp_info->pdp_type | 0xf000, - GPRS_GSUP_PDP_TYPE_SIZE)); - } - - if (pdp_info->apn_enc) { - msgb_tlv_put(msg, GPRS_GSUP_ACCESS_POINT_NAME_IE, - pdp_info->apn_enc_len, pdp_info->apn_enc); - } - - if (pdp_info->qos_enc) { - msgb_tlv_put(msg, GPRS_GSUP_PDP_QOS_IE, - pdp_info->qos_enc_len, pdp_info->qos_enc); - } - - /* Update length field */ - *len_field = msgb_length(msg) - old_len; -} - -static void encode_auth_info(struct msgb *msg, enum gprs_gsup_iei iei, - const struct gsm_auth_tuple *auth_tuple) -{ - uint8_t *len_field; - size_t old_len; - - len_field = msgb_tlv_put(msg, iei, 0, NULL) - 1; - old_len = msgb_length(msg); - - msgb_tlv_put(msg, GPRS_GSUP_RAND_IE, - sizeof(auth_tuple->rand), auth_tuple->rand); - - msgb_tlv_put(msg, GPRS_GSUP_SRES_IE, - sizeof(auth_tuple->sres), auth_tuple->sres); - - msgb_tlv_put(msg, GPRS_GSUP_KC_IE, - sizeof(auth_tuple->kc), auth_tuple->kc); - - /* Update length field */ - *len_field = msgb_length(msg) - old_len; -} - -void gprs_gsup_encode(struct msgb *msg, const struct gprs_gsup_message *gsup_msg) -{ - uint8_t u8; - int idx; - uint8_t bcd_buf[GSM48_MI_SIZE] = {0}; - size_t bcd_len; - - /* generic part */ - OSMO_ASSERT(gsup_msg->message_type); - msgb_v_put(msg, gsup_msg->message_type); - - bcd_len = gsm48_encode_bcd_number(bcd_buf, sizeof(bcd_buf), 0, - gsup_msg->imsi); - - OSMO_ASSERT(bcd_len > 1); - - /* Note that gsm48_encode_bcd_number puts the length into the first - * octet. Since msgb_tlv_put will add this length byte, we'll have to - * skip it */ - msgb_tlv_put(msg, GPRS_GSUP_IMSI_IE, bcd_len - 1, &bcd_buf[1]); - - /* specific parts */ - if (gsup_msg->msisdn_enc) - msgb_tlv_put(msg, GPRS_GSUP_MSISDN_IE, - gsup_msg->msisdn_enc_len, gsup_msg->msisdn_enc); - if (gsup_msg->hlr_enc) - msgb_tlv_put(msg, GPRS_GSUP_HLR_NUMBER_IE, - gsup_msg->hlr_enc_len, gsup_msg->hlr_enc); - - if ((u8 = gsup_msg->cause)) - msgb_tlv_put(msg, GPRS_GSUP_CAUSE_IE, sizeof(u8), &u8); - - if ((u8 = gsup_msg->cancel_type)) { - u8 -= 1; - msgb_tlv_put(msg, GPRS_GSUP_CANCEL_TYPE_IE, sizeof(u8), &u8); - } - - if (gsup_msg->pdp_info_compl) - msgb_tlv_put(msg, GPRS_GSUP_PDP_INFO_COMPL_IE, 0, &u8); - - if (gsup_msg->freeze_ptmsi) - msgb_tlv_put(msg, GPRS_GSUP_FREEZE_PTMSI_IE, 0, &u8); - - for (idx = 0; idx < gsup_msg->num_pdp_infos; idx++) { - const struct gprs_gsup_pdp_info *pdp_info; - - pdp_info = &gsup_msg->pdp_infos[idx]; - - if (pdp_info->context_id == 0) - continue; - - if (pdp_info->have_info) { - encode_pdp_info(msg, GPRS_GSUP_PDP_INFO_IE, pdp_info); - } else { - u8 = pdp_info->context_id; - msgb_tlv_put(msg, GPRS_GSUP_PDP_CONTEXT_ID_IE, - sizeof(u8), &u8); - } - } - - for (idx = 0; idx < gsup_msg->num_auth_tuples; idx++) { - const struct gsm_auth_tuple *auth_info; - - auth_info = &gsup_msg->auth_tuples[idx]; - - if (auth_info->key_seq == GSM_KEY_SEQ_INVAL) - continue; - - encode_auth_info(msg, GPRS_GSUP_AUTH_TUPLE_IE, auth_info); - } -} |