| /* GSM Mobile Radio Interface Layer 3 messages on the A-bis interface |
| * 3GPP TS 04.08 version 7.21.0 Release 1998 / ETSI TS 100 940 V7.21.0 */ |
| |
| /* (C) 2008-2016 by Harald Welte <laforge@gnumonks.org> |
| * (C) 2008-2012 by Holger Hans Peter Freyther <zecke@selfish.org> |
| * |
| * 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 <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <stdbool.h> |
| #include <errno.h> |
| #include <time.h> |
| #include <netinet/in.h> |
| #include <regex.h> |
| #include <sys/types.h> |
| |
| #include "bscconfig.h" |
| |
| #include <osmocom/msc/db.h> |
| #include <osmocom/msc/debug.h> |
| #include <osmocom/msc/gsm_data.h> |
| #include <osmocom/msc/gsm_subscriber.h> |
| #include <osmocom/msc/gsm_04_11.h> |
| #include <osmocom/msc/gsm_04_08.h> |
| #include <osmocom/msc/gsm_04_80.h> |
| #include <osmocom/msc/gsm_04_14.h> |
| #include <osmocom/msc/gsm_09_11.h> |
| #include <osmocom/msc/signal.h> |
| #include <osmocom/msc/transaction.h> |
| #include <osmocom/msc/silent_call.h> |
| #include <osmocom/msc/mncc_int.h> |
| #include <osmocom/abis/e1_input.h> |
| #include <osmocom/core/bitvec.h> |
| #include <osmocom/msc/vlr.h> |
| #include <osmocom/msc/msc_ifaces.h> |
| |
| #include <osmocom/gsm/gsm48.h> |
| #include <osmocom/gsm/gsm0480.h> |
| #include <osmocom/gsm/gsm_utils.h> |
| #include <osmocom/gsm/protocol/gsm_04_08.h> |
| #include <osmocom/core/msgb.h> |
| #include <osmocom/core/talloc.h> |
| #include <osmocom/core/utils.h> |
| #include <osmocom/core/byteswap.h> |
| #include <osmocom/gsm/tlv.h> |
| #include <osmocom/crypt/auth.h> |
| #ifdef BUILD_IU |
| #include <osmocom/ranap/iu_client.h> |
| #endif |
| |
| #include <osmocom/msc/msc_ifaces.h> |
| #include <osmocom/msc/a_iface.h> |
| #include <osmocom/msc/msc_mgcp.h> |
| |
| #include <assert.h> |
| |
| |
| void *tall_locop_ctx; |
| void *tall_authciphop_ctx; |
| |
| static int gsm0408_loc_upd_acc(struct ran_conn *conn, |
| uint32_t send_tmsi); |
| |
| /*! Send a simple GSM 04.08 message without any payload |
| * \param conn Active RAN connection |
| * \param[in] pdisc Protocol discriminator |
| * \param[in] msg_type Message type |
| * \return result of \ref gsm48_conn_sendmsg |
| */ |
| int gsm48_tx_simple(struct ran_conn *conn, |
| uint8_t pdisc, uint8_t msg_type) |
| { |
| struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 TX SIMPLE"); |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| |
| gh->proto_discr = pdisc; |
| gh->msg_type = msg_type; |
| |
| return gsm48_conn_sendmsg(msg, conn, NULL); |
| } |
| |
| static bool classmark1_is_r99(const struct gsm48_classmark1 *cm1) |
| { |
| return cm1->rev_lev >= 2; |
| } |
| |
| static bool classmark2_is_r99(const uint8_t *cm2, uint8_t cm2_len) |
| { |
| uint8_t rev_lev; |
| if (!cm2_len) |
| return false; |
| rev_lev = (cm2[0] >> 5) & 0x3; |
| return rev_lev >= 2; |
| } |
| |
| static bool classmark_is_r99(struct gsm_classmark *cm) |
| { |
| if (cm->classmark1_set) |
| return classmark1_is_r99(&cm->classmark1); |
| return classmark2_is_r99(cm->classmark2, cm->classmark2_len); |
| } |
| |
| static const char *classmark_a5_name(const struct gsm_classmark *cm) |
| { |
| static char buf[128]; |
| char cm1[42]; |
| char cm2[42]; |
| char cm3[42]; |
| |
| if (cm->classmark1_set) |
| snprintf(cm1, sizeof(cm1), "cm1{a5/1=%s}", |
| cm->classmark1.a5_1 ? "not-supported":"supported" /* inverted logic */); |
| else |
| snprintf(cm1, sizeof(cm1), "no-cm1"); |
| |
| if (cm->classmark2_len >= 3) |
| snprintf(cm2, sizeof(cm2), " cm2{0x%x=%s%s}", |
| cm->classmark2[2], |
| cm->classmark2[2] & 0x1 ? " A5/2" : "", |
| cm->classmark2[2] & 0x2 ? " A5/3" : ""); |
| else |
| snprintf(cm2, sizeof(cm2), " no-cm2"); |
| |
| if (cm->classmark3_len >= 1) |
| snprintf(cm3, sizeof(cm3), " cm3{0x%x=%s%s%s%s}", |
| cm->classmark3[0], |
| cm->classmark3[0] & (1 << 0) ? " A5/4" : "", |
| cm->classmark3[0] & (1 << 1) ? " A5/5" : "", |
| cm->classmark3[0] & (1 << 2) ? " A5/6" : "", |
| cm->classmark3[0] & (1 << 3) ? " A5/7" : ""); |
| else |
| snprintf(cm3, sizeof(cm3), " no-cm3"); |
| |
| snprintf(buf, sizeof(buf), "%s%s%s", cm1, cm2, cm3); |
| return buf; |
| } |
| |
| /* Determine if the given CLASSMARK (1/2/3) value permits a given A5/n cipher. |
| * Return 1 when the given A5/n is permitted, 0 when not, and negative if the respective MS CLASSMARK is |
| * not known, where the negative number indicates the classmark type: -2 means Classmark 2 is not |
| * available. */ |
| static int classmark_supports_a5(const struct gsm_classmark *cm, uint8_t a5) |
| { |
| switch (a5) { |
| case 0: |
| /* all phones must implement A5/0, see 3GPP TS 43.020 4.9 */ |
| return 1; |
| case 1: |
| /* 3GPP TS 43.020 4.9 requires A5/1 to be suppored by all phones and actually states: |
| * "The network shall not provide service to an MS which indicates that it does not |
| * support the ciphering algorithm A5/1.". However, let's be more tolerant based |
| * on policy here */ |
| /* See 3GPP TS 24.008 10.5.1.7 */ |
| if (!cm->classmark1_set) { |
| DEBUGP(DMSC, "CLASSMARK 1 unknown, assuming MS supports A5/1\n"); |
| return -1; |
| } else { |
| if (cm->classmark1.a5_1) |
| return 0; /* Inverted logic for this bit! */ |
| else |
| return 1; |
| } |
| break; |
| case 2: |
| case 3: |
| /* See 3GPP TS 24.008 10.5.1.6 */ |
| if (cm->classmark2_len < 3) { |
| return -2; |
| } else { |
| if (cm->classmark2[2] & (1 << (a5-2))) |
| return 1; |
| else |
| return 0; |
| } |
| break; |
| case 4: |
| case 5: |
| case 6: |
| case 7: |
| /* See 3GPP TS 24.008 10.5.1.7 */ |
| if (cm->classmark3_len < 1) { |
| return -3; |
| } else { |
| if (cm->classmark3[0] & (1 << (a5-4))) |
| return 1; |
| else |
| return 0; |
| } |
| break; |
| default: |
| return false; |
| } |
| } |
| |
| int gsm48_conn_sendmsg(struct msgb *msg, struct ran_conn *conn, struct gsm_trans *trans) |
| { |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msg->data; |
| |
| /* if we get passed a transaction reference, do some common |
| * work that the caller no longer has to do */ |
| if (trans) { |
| gh->proto_discr = trans->protocol | (trans->transaction_id << 4); |
| OMSC_LINKID_CB(msg) = trans->dlci; |
| } |
| |
| return msc_tx_dtap(conn, msg); |
| } |
| |
| /* clear all transactions globally; used in case of MNCC socket disconnect */ |
| void gsm0408_clear_all_trans(struct gsm_network *net, int protocol) |
| { |
| struct gsm_trans *trans, *temp; |
| |
| LOGP(DCC, LOGL_NOTICE, "Clearing all currently active transactions!!!\n"); |
| |
| llist_for_each_entry_safe(trans, temp, &net->trans_list, entry) { |
| if (trans->protocol == protocol) { |
| trans->callref = 0; |
| trans_free(trans); |
| } |
| } |
| } |
| |
| /* Chapter 9.2.14 : Send LOCATION UPDATING REJECT */ |
| static int gsm0408_loc_upd_rej(struct ran_conn *conn, uint8_t cause) |
| { |
| struct msgb *msg; |
| |
| msg = gsm48_create_loc_upd_rej(cause); |
| if (!msg) { |
| LOGP(DMM, LOGL_ERROR, "Failed to create msg for LOCATION UPDATING REJECT.\n"); |
| return -1; |
| } |
| |
| LOGP(DMM, LOGL_INFO, "Subscriber %s: LOCATION UPDATING REJECT\n", |
| vlr_subscr_name(conn->vsub)); |
| |
| return gsm48_conn_sendmsg(msg, conn, NULL); |
| } |
| |
| /* Chapter 9.2.13 : Send LOCATION UPDATE ACCEPT */ |
| static int gsm0408_loc_upd_acc(struct ran_conn *conn, |
| uint32_t send_tmsi) |
| { |
| struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 LOC UPD ACC"); |
| struct gsm48_hdr *gh; |
| struct gsm48_loc_area_id *lai; |
| uint8_t *mid; |
| struct osmo_location_area_id laid = { |
| .plmn = conn->network->plmn, |
| .lac = conn->lac, |
| }; |
| |
| gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| gh->proto_discr = GSM48_PDISC_MM; |
| gh->msg_type = GSM48_MT_MM_LOC_UPD_ACCEPT; |
| |
| lai = (struct gsm48_loc_area_id *) msgb_put(msg, sizeof(*lai)); |
| gsm48_generate_lai2(lai, &laid); |
| |
| if (send_tmsi == GSM_RESERVED_TMSI) { |
| /* we did not allocate a TMSI to the MS, so we need to |
| * include the IMSI in order for the MS to delete any |
| * old TMSI that might still be allocated */ |
| uint8_t mi[10]; |
| int len; |
| len = gsm48_generate_mid_from_imsi(mi, conn->vsub->imsi); |
| mid = msgb_put(msg, len); |
| memcpy(mid, mi, len); |
| DEBUGP(DMM, "-> %s LOCATION UPDATE ACCEPT\n", |
| vlr_subscr_name(conn->vsub)); |
| } else { |
| /* Include the TMSI, which means that the MS will send a |
| * TMSI REALLOCATION COMPLETE, and we should wait for |
| * that until T3250 expiration */ |
| mid = msgb_put(msg, GSM48_MID_TMSI_LEN); |
| gsm48_generate_mid_from_tmsi(mid, send_tmsi); |
| DEBUGP(DMM, "-> %s LOCATION UPDATE ACCEPT (TMSI = 0x%08x)\n", |
| vlr_subscr_name(conn->vsub), |
| send_tmsi); |
| } |
| /* TODO: Follow-on proceed */ |
| /* TODO: CTS permission */ |
| /* TODO: Equivalent PLMNs */ |
| /* TODO: Emergency Number List */ |
| /* TODO: Per-MS T3312 */ |
| |
| |
| return gsm48_conn_sendmsg(msg, conn, NULL); |
| } |
| |
| /* Transmit Chapter 9.2.10 Identity Request */ |
| static int mm_tx_identity_req(struct ran_conn *conn, uint8_t id_type) |
| { |
| struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 ID REQ"); |
| struct gsm48_hdr *gh; |
| |
| gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); |
| gh->proto_discr = GSM48_PDISC_MM; |
| gh->msg_type = GSM48_MT_MM_ID_REQ; |
| gh->data[0] = id_type; |
| |
| return gsm48_conn_sendmsg(msg, conn, NULL); |
| } |
| |
| /* Parse Chapter 9.2.11 Identity Response */ |
| static int mm_rx_id_resp(struct ran_conn *conn, struct msgb *msg) |
| { |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| uint8_t *mi = gh->data+1; |
| uint8_t mi_len = gh->data[0]; |
| |
| if (!conn->vsub) { |
| LOGP(DMM, LOGL_ERROR, |
| "Rx MM Identity Response: invalid: no subscriber\n"); |
| return -EINVAL; |
| } |
| |
| DEBUGP(DMM, "IDENTITY RESPONSE: MI=%s\n", osmo_mi_name(mi, mi_len)); |
| |
| osmo_signal_dispatch(SS_SUBSCR, S_SUBSCR_IDENTITY, gh->data); |
| |
| return vlr_subscr_rx_id_resp(conn->vsub, mi, mi_len); |
| } |
| |
| /* Chapter 9.2.15: Receive Location Updating Request. |
| * Keep this function non-static for direct invocation by unit tests. */ |
| int mm_rx_loc_upd_req(struct ran_conn *conn, struct msgb *msg) |
| { |
| struct gsm_network *net = conn->network; |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| struct gsm48_loc_upd_req *lu; |
| uint8_t mi_type; |
| char mi_string[GSM48_MI_SIZE]; |
| enum vlr_lu_type vlr_lu_type = VLR_LU_TYPE_REGULAR; |
| uint32_t tmsi; |
| char *imsi; |
| struct osmo_location_area_id old_lai, new_lai; |
| struct osmo_fsm_inst *lu_fsm; |
| bool is_utran; |
| |
| lu = (struct gsm48_loc_upd_req *) gh->data; |
| |
| if (ran_conn_is_establishing_auth_ciph(conn)) { |
| LOG_RAN_CONN_CAT(conn, DMM, LOGL_ERROR, |
| "Cannot accept another LU, conn already busy establishing authenticity;" |
| " extraneous LOCATION UPDATING REQUEST: MI=%s LU-type=%s\n", |
| osmo_mi_name(lu->mi, lu->mi_len), osmo_lu_type_name(lu->type)); |
| return -EINVAL; |
| } |
| |
| if (ran_conn_is_accepted(conn)) { |
| LOG_RAN_CONN_CAT(conn, DMM, LOGL_ERROR, |
| "Cannot accept another LU, conn already established;" |
| " extraneous LOCATION UPDATING REQUEST: MI=%s LU-type=%s\n", |
| osmo_mi_name(lu->mi, lu->mi_len), osmo_lu_type_name(lu->type)); |
| return -EINVAL; |
| } |
| |
| conn->complete_layer3_type = COMPLETE_LAYER3_LU; |
| ran_conn_update_id_from_mi(conn, lu->mi, lu->mi_len); |
| |
| LOG_RAN_CONN_CAT(conn, DMM, LOGL_DEBUG, "LOCATION UPDATING REQUEST: MI=%s LU-type=%s\n", |
| osmo_mi_name(lu->mi, lu->mi_len), osmo_lu_type_name(lu->type)); |
| |
| osmo_signal_dispatch(SS_SUBSCR, S_SUBSCR_IDENTITY, &lu->mi_len); |
| |
| switch (lu->type) { |
| case GSM48_LUPD_NORMAL: |
| rate_ctr_inc(&conn->network->msc_ctrs->ctr[MSC_CTR_LOC_UPDATE_TYPE_NORMAL]); |
| vlr_lu_type = VLR_LU_TYPE_REGULAR; |
| break; |
| case GSM48_LUPD_IMSI_ATT: |
| rate_ctr_inc(&conn->network->msc_ctrs->ctr[MSC_CTR_LOC_UPDATE_TYPE_ATTACH]); |
| vlr_lu_type = VLR_LU_TYPE_IMSI_ATTACH; |
| break; |
| case GSM48_LUPD_PERIODIC: |
| rate_ctr_inc(&conn->network->msc_ctrs->ctr[MSC_CTR_LOC_UPDATE_TYPE_PERIODIC]); |
| vlr_lu_type = VLR_LU_TYPE_PERIODIC; |
| break; |
| } |
| |
| /* TODO: 10.5.1.6 MS Classmark for UMTS / Classmark 2 */ |
| /* TODO: 10.5.3.14 Aditional update parameters (CS fallback calls) */ |
| /* TODO: 10.5.7.8 Device properties */ |
| /* TODO: 10.5.1.15 MS network feature support */ |
| |
| mi_type = lu->mi[0] & GSM_MI_TYPE_MASK; |
| gsm48_mi_to_string(mi_string, sizeof(mi_string), lu->mi, lu->mi_len); |
| switch (mi_type) { |
| case GSM_MI_TYPE_IMSI: |
| tmsi = GSM_RESERVED_TMSI; |
| imsi = mi_string; |
| break; |
| case GSM_MI_TYPE_TMSI: |
| tmsi = tmsi_from_string(mi_string); |
| imsi = NULL; |
| break; |
| default: |
| LOG_RAN_CONN_CAT(conn, DMM, LOGL_ERROR, "unknown mobile identity type\n"); |
| tmsi = GSM_RESERVED_TMSI; |
| imsi = NULL; |
| break; |
| } |
| |
| gsm48_decode_lai2(&lu->lai, &old_lai); |
| new_lai.plmn = conn->network->plmn; |
| new_lai.lac = conn->lac; |
| LOG_RAN_CONN_CAT(conn, DMM, LOGL_DEBUG, "LU/new-LAC: %u/%u\n", old_lai.lac, new_lai.lac); |
| |
| is_utran = (conn->via_ran == OSMO_RAT_UTRAN_IU); |
| lu_fsm = vlr_loc_update(conn->fi, |
| RAN_CONN_E_ACCEPTED, RAN_CONN_E_CN_CLOSE, NULL, |
| net->vlr, conn, vlr_lu_type, tmsi, imsi, |
| &old_lai, &new_lai, |
| is_utran || conn->network->authentication_required, |
| is_utran || conn->network->a5_encryption_mask > 0x01, |
| lu->key_seq, |
| classmark1_is_r99(&lu->classmark1), |
| is_utran, |
| net->vlr->cfg.assign_tmsi); |
| if (!lu_fsm) { |
| LOG_RAN_CONN(conn, LOGL_ERROR, "Can't start LU FSM\n"); |
| return 0; |
| } |
| |
| /* From vlr_loc_update() we expect an implicit dispatch of |
| * VLR_ULA_E_UPDATE_LA, and thus we expect msc_vlr_subscr_assoc() to |
| * already have been called and completed. Has an error occured? */ |
| |
| if (!conn->vsub || conn->vsub->lu_fsm != lu_fsm) { |
| LOG_RAN_CONN(conn, LOGL_ERROR, "internal error during Location Updating attempt\n"); |
| return -EIO; |
| } |
| |
| conn->vsub->classmark.classmark1 = lu->classmark1; |
| conn->vsub->classmark.classmark1_set = true; |
| |
| ran_conn_complete_layer_3(conn); |
| return 0; |
| } |
| |
| /* Turn int into semi-octet representation: 98 => 0x89 */ |
| /* FIXME: libosmocore/libosmogsm */ |
| static uint8_t bcdify(uint8_t value) |
| { |
| uint8_t ret; |
| |
| ret = value / 10; |
| ret |= (value % 10) << 4; |
| |
| return ret; |
| } |
| |
| /* Generate a message buffer that contains a valid MM info message, |
| * See also 3GPP TS 24.008, chapter 9.2.15a */ |
| struct msgb *gsm48_create_mm_info(struct gsm_network *net) |
| { |
| struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 MM INF"); |
| struct gsm48_hdr *gh; |
| uint8_t *ptr8; |
| int name_len, name_pad; |
| |
| time_t cur_t; |
| struct tm* gmt_time; |
| struct tm* local_time; |
| int tzunits; |
| int dst = 0; |
| |
| gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| gh->proto_discr = GSM48_PDISC_MM; |
| gh->msg_type = GSM48_MT_MM_INFO; |
| |
| if (net->name_long) { |
| #if 0 |
| name_len = strlen(net->name_long); |
| /* 10.5.3.5a */ |
| ptr8 = msgb_put(msg, 3); |
| ptr8[0] = GSM48_IE_NAME_LONG; |
| ptr8[1] = name_len*2 +1; |
| ptr8[2] = 0x90; /* UCS2, no spare bits, no CI */ |
| |
| ptr16 = (uint16_t *) msgb_put(msg, name_len*2); |
| for (i = 0; i < name_len; i++) |
| ptr16[i] = htons(net->name_long[i]); |
| |
| /* FIXME: Use Cell Broadcast, not UCS-2, since |
| * UCS-2 is only supported by later revisions of the spec */ |
| #endif |
| name_len = (strlen(net->name_long)*7)/8; |
| name_pad = (8 - strlen(net->name_long)*7)%8; |
| if (name_pad > 0) |
| name_len++; |
| /* 10.5.3.5a */ |
| ptr8 = msgb_put(msg, 3); |
| ptr8[0] = GSM48_IE_NAME_LONG; |
| ptr8[1] = name_len +1; |
| ptr8[2] = 0x80 | name_pad; /* Cell Broadcast DCS, no CI */ |
| |
| ptr8 = msgb_put(msg, name_len); |
| gsm_7bit_encode_n(ptr8, name_len, net->name_long, NULL); |
| |
| } |
| |
| if (net->name_short) { |
| #if 0 |
| name_len = strlen(net->name_short); |
| /* 10.5.3.5a */ |
| ptr8 = (uint8_t *) msgb_put(msg, 3); |
| ptr8[0] = GSM48_IE_NAME_SHORT; |
| ptr8[1] = name_len*2 + 1; |
| ptr8[2] = 0x90; /* UCS2, no spare bits, no CI */ |
| |
| ptr16 = (uint16_t *) msgb_put(msg, name_len*2); |
| for (i = 0; i < name_len; i++) |
| ptr16[i] = htons(net->name_short[i]); |
| #endif |
| name_len = (strlen(net->name_short)*7)/8; |
| name_pad = (8 - strlen(net->name_short)*7)%8; |
| if (name_pad > 0) |
| name_len++; |
| /* 10.5.3.5a */ |
| ptr8 = (uint8_t *) msgb_put(msg, 3); |
| ptr8[0] = GSM48_IE_NAME_SHORT; |
| ptr8[1] = name_len +1; |
| ptr8[2] = 0x80 | name_pad; /* Cell Broadcast DCS, no CI */ |
| |
| ptr8 = msgb_put(msg, name_len); |
| gsm_7bit_encode_n(ptr8, name_len, net->name_short, NULL); |
| |
| } |
| |
| /* Section 10.5.3.9 */ |
| cur_t = time(NULL); |
| gmt_time = gmtime(&cur_t); |
| |
| ptr8 = msgb_put(msg, 8); |
| ptr8[0] = GSM48_IE_NET_TIME_TZ; |
| ptr8[1] = bcdify(gmt_time->tm_year % 100); |
| ptr8[2] = bcdify(gmt_time->tm_mon + 1); |
| ptr8[3] = bcdify(gmt_time->tm_mday); |
| ptr8[4] = bcdify(gmt_time->tm_hour); |
| ptr8[5] = bcdify(gmt_time->tm_min); |
| ptr8[6] = bcdify(gmt_time->tm_sec); |
| |
| if (net->tz.override) { |
| /* Convert tz.hr and tz.mn to units */ |
| if (net->tz.hr < 0) { |
| tzunits = ((net->tz.hr/-1)*4); |
| tzunits = tzunits + (net->tz.mn/15); |
| ptr8[7] = bcdify(tzunits); |
| /* Set negative time */ |
| ptr8[7] |= 0x08; |
| } |
| else { |
| tzunits = net->tz.hr*4; |
| tzunits = tzunits + (net->tz.mn/15); |
| ptr8[7] = bcdify(tzunits); |
| } |
| /* Convert DST value */ |
| if (net->tz.dst >= 0 && net->tz.dst <= 2) |
| dst = net->tz.dst; |
| } |
| else { |
| /* Need to get GSM offset and convert into 15 min units */ |
| /* This probably breaks if gmtoff returns a value not evenly divisible by 15? */ |
| #ifdef HAVE_TM_GMTOFF_IN_TM |
| local_time = localtime(&cur_t); |
| tzunits = (local_time->tm_gmtoff/60)/15; |
| #else |
| /* find timezone offset */ |
| time_t utc; |
| double offsetFromUTC; |
| utc = mktime(gmt_time); |
| local_time = localtime(&cur_t); |
| offsetFromUTC = difftime(cur_t, utc); |
| if (local_time->tm_isdst) |
| offsetFromUTC += 3600.0; |
| tzunits = ((int)offsetFromUTC) / 60 / 15; |
| #endif |
| if (tzunits < 0) { |
| tzunits = tzunits/-1; |
| ptr8[7] = bcdify(tzunits); |
| /* Flip it to negative */ |
| ptr8[7] |= 0x08; |
| } |
| else |
| ptr8[7] = bcdify(tzunits); |
| |
| /* Does not support DST +2 */ |
| if (local_time->tm_isdst) |
| dst = 1; |
| } |
| |
| if (dst) { |
| ptr8 = msgb_put(msg, 3); |
| ptr8[0] = GSM48_IE_NET_DST; |
| ptr8[1] = 1; |
| ptr8[2] = dst; |
| } |
| |
| return msg; |
| } |
| |
| /* Section 9.2.15a */ |
| int gsm48_tx_mm_info(struct ran_conn *conn) |
| { |
| struct gsm_network *net = conn->network; |
| struct msgb *msg; |
| |
| msg = gsm48_create_mm_info(net); |
| |
| LOG_RAN_CONN(conn, LOGL_DEBUG, "Tx MM INFO\n"); |
| return gsm48_conn_sendmsg(msg, conn, NULL); |
| } |
| |
| /*! Send an Authentication Request to MS on the given RAN connection |
| * according to 3GPP/ETSI TS 24.008, Section 9.2.2. |
| * \param[in] conn Subscriber connection to send on. |
| * \param[in] rand Random challenge token to send, must be 16 bytes long. |
| * \param[in] autn r99: In case of UMTS mutual authentication, AUTN token to |
| * send; must be 16 bytes long, or pass NULL for plain GSM auth. |
| * \param[in] key_seq auth tuple's sequence number. |
| */ |
| int gsm48_tx_mm_auth_req(struct ran_conn *conn, uint8_t *rand, |
| uint8_t *autn, int key_seq) |
| { |
| struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 AUTH REQ"); |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| struct gsm48_auth_req *ar = (struct gsm48_auth_req *) msgb_put(msg, sizeof(*ar)); |
| |
| DEBUGP(DMM, "Tx AUTH REQ (rand = %s)\n", osmo_hexdump_nospc(rand, 16)); |
| if (autn) |
| DEBUGP(DMM, " AUTH REQ (autn = %s)\n", osmo_hexdump_nospc(autn, 16)); |
| |
| gh->proto_discr = GSM48_PDISC_MM; |
| gh->msg_type = GSM48_MT_MM_AUTH_REQ; |
| |
| ar->key_seq = key_seq; |
| |
| /* 16 bytes RAND parameters */ |
| osmo_static_assert(sizeof(ar->rand) == 16, sizeof_auth_req_r99_rand); |
| if (rand) |
| memcpy(ar->rand, rand, 16); |
| |
| |
| /* 16 bytes AUTN */ |
| if (autn) |
| msgb_tlv_put(msg, GSM48_IE_AUTN, 16, autn); |
| |
| return gsm48_conn_sendmsg(msg, conn, NULL); |
| } |
| |
| /* Section 9.2.1 */ |
| int gsm48_tx_mm_auth_rej(struct ran_conn *conn) |
| { |
| DEBUGP(DMM, "-> AUTH REJECT\n"); |
| return gsm48_tx_simple(conn, GSM48_PDISC_MM, GSM48_MT_MM_AUTH_REJ); |
| } |
| |
| static int msc_vlr_tx_cm_serv_acc(void *msc_conn_ref); |
| static int msc_vlr_tx_cm_serv_rej(void *msc_conn_ref, enum gsm48_reject_value result); |
| |
| static int cm_serv_reuse_conn(struct ran_conn *conn, const uint8_t *mi_lv) |
| { |
| uint8_t mi_type; |
| char mi_string[GSM48_MI_SIZE]; |
| uint32_t tmsi; |
| |
| gsm48_mi_to_string(mi_string, sizeof(mi_string), mi_lv+1, mi_lv[0]); |
| mi_type = mi_lv[1] & GSM_MI_TYPE_MASK; |
| |
| switch (mi_type) { |
| case GSM_MI_TYPE_IMSI: |
| if (vlr_subscr_matches_imsi(conn->vsub, mi_string)) |
| goto accept_reuse; |
| break; |
| case GSM_MI_TYPE_TMSI: |
| tmsi = osmo_load32be(mi_lv+2); |
| if (vlr_subscr_matches_tmsi(conn->vsub, tmsi)) |
| goto accept_reuse; |
| break; |
| case GSM_MI_TYPE_IMEI: |
| if (vlr_subscr_matches_imei(conn->vsub, mi_string)) |
| goto accept_reuse; |
| break; |
| default: |
| break; |
| } |
| |
| LOGP(DMM, LOGL_ERROR, "%s: CM Service Request with mismatching mobile identity: %s %s\n", |
| vlr_subscr_name(conn->vsub), gsm48_mi_type_name(mi_type), mi_string); |
| msc_vlr_tx_cm_serv_rej(conn, GSM48_REJECT_ILLEGAL_MS); |
| return -EINVAL; |
| |
| accept_reuse: |
| DEBUGP(DMM, "%s: re-using already accepted connection\n", |
| vlr_subscr_name(conn->vsub)); |
| |
| if (!conn->received_cm_service_request) { |
| conn->received_cm_service_request = true; |
| ran_conn_get(conn, RAN_CONN_USE_CM_SERVICE); |
| } |
| ran_conn_update_id(conn); |
| return conn->network->vlr->ops.tx_cm_serv_acc(conn); |
| } |
| |
| /* |
| * Handle CM Service Requests |
| * a) Verify that the packet is long enough to contain the information |
| * we require otherwsie reject with INCORRECT_MESSAGE |
| * b) Try to parse the TMSI. If we do not have one reject |
| * c) Check that we know the subscriber with the TMSI otherwise reject |
| * with a HLR cause |
| * d) Set the subscriber on the conn and accept |
| * |
| * Keep this function non-static for direct invocation by unit tests. |
| */ |
| int gsm48_rx_mm_serv_req(struct ran_conn *conn, struct msgb *msg) |
| { |
| struct gsm_network *net = conn->network; |
| uint8_t mi_type; |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| struct gsm48_service_request *req = |
| (struct gsm48_service_request *)gh->data; |
| /* unfortunately in Phase1 the classmark2 length is variable */ |
| uint8_t classmark2_len = gh->data[1]; |
| uint8_t *classmark2 = gh->data+2; |
| uint8_t *mi_p = classmark2 + classmark2_len; |
| uint8_t mi_len = *mi_p; |
| uint8_t *mi = mi_p + 1; |
| struct osmo_location_area_id lai; |
| bool is_utran; |
| |
| lai.plmn = conn->network->plmn; |
| lai.lac = conn->lac; |
| |
| if (msg->data_len < sizeof(struct gsm48_service_request*)) { |
| LOG_RAN_CONN(conn, LOGL_ERROR, "Rx CM SERVICE REQUEST: wrong message size (%u < %zu)\n", |
| msg->data_len, sizeof(struct gsm48_service_request*)); |
| return msc_gsm48_tx_mm_serv_rej(conn, |
| GSM48_REJECT_INCORRECT_MESSAGE); |
| } |
| |
| if (msg->data_len < req->mi_len + 6) { |
| LOG_RAN_CONN(conn, LOGL_ERROR, "Rx CM SERVICE REQUEST: message does not fit in packet\n"); |
| return msc_gsm48_tx_mm_serv_rej(conn, |
| GSM48_REJECT_INCORRECT_MESSAGE); |
| } |
| |
| if (ran_conn_is_establishing_auth_ciph(conn)) { |
| LOG_RAN_CONN(conn, LOGL_ERROR, |
| "Cannot accept CM Service Request, conn already busy establishing authenticity\n"); |
| msc_vlr_tx_cm_serv_rej(conn, GSM48_REJECT_CONGESTION); |
| return -EINVAL; |
| /* or should we accept and note down the service request anyway? */ |
| } |
| |
| conn->complete_layer3_type = COMPLETE_LAYER3_CM_SERVICE_REQ; |
| ran_conn_update_id_from_mi(conn, mi, mi_len); |
| LOG_RAN_CONN_CAT(conn, DMM, LOGL_DEBUG, "Rx CM SERVICE REQUEST cm_service_type=0x%02x\n", |
| req->cm_service_type); |
| |
| mi_type = (mi && mi_len) ? (mi[0] & GSM_MI_TYPE_MASK) : GSM_MI_TYPE_NONE; |
| switch (mi_type) { |
| case GSM_MI_TYPE_IMSI: |
| case GSM_MI_TYPE_TMSI: |
| /* continue below */ |
| break; |
| case GSM_MI_TYPE_IMEI: |
| if (req->cm_service_type == GSM48_CMSERV_EMERGENCY) { |
| /* We don't do emergency calls by IMEI */ |
| LOG_RAN_CONN(conn, LOGL_NOTICE, "Tx CM SERVICE REQUEST REJECT\n"); |
| return msc_gsm48_tx_mm_serv_rej(conn, GSM48_REJECT_IMEI_NOT_ACCEPTED); |
| } |
| /* fall-through for non-emergency setup */ |
| default: |
| LOG_RAN_CONN(conn, LOGL_ERROR, "MI type is not expected: %s\n", gsm48_mi_type_name(mi_type)); |
| return msc_gsm48_tx_mm_serv_rej(conn, |
| GSM48_REJECT_INCORRECT_MESSAGE); |
| } |
| |
| switch (req->cm_service_type) { |
| case GSM48_CMSERV_MO_CALL_PACKET: |
| case GSM48_CMSERV_EMERGENCY: |
| case GSM48_CMSERV_SMS: |
| case GSM48_CMSERV_SUP_SERV: |
| /* continue below */ |
| break; |
| default: |
| return msc_gsm48_tx_mm_serv_rej(conn, GSM48_REJECT_SRV_OPT_NOT_SUPPORTED); |
| } |
| |
| if (ran_conn_is_accepted(conn)) |
| return cm_serv_reuse_conn(conn, mi_p); |
| |
| osmo_signal_dispatch(SS_SUBSCR, S_SUBSCR_IDENTITY, mi_p); |
| |
| is_utran = (conn->via_ran == OSMO_RAT_UTRAN_IU); |
| vlr_proc_acc_req(conn->fi, |
| RAN_CONN_E_ACCEPTED, RAN_CONN_E_CN_CLOSE, NULL, |
| net->vlr, conn, |
| VLR_PR_ARQ_T_CM_SERV_REQ, mi-1, &lai, |
| is_utran || conn->network->authentication_required, |
| is_utran || conn->network->a5_encryption_mask > 0x01, |
| req->cipher_key_seq, |
| classmark2_is_r99(classmark2, classmark2_len), |
| is_utran); |
| |
| /* From vlr_proc_acc_req() we expect an implicit dispatch of PR_ARQ_E_START we expect |
| * msc_vlr_subscr_assoc() to already have been called and completed. Has an error occured? */ |
| if (!conn->vsub) { |
| LOG_RAN_CONN(conn, LOGL_ERROR, "subscriber not allowed to do a CM Service Request\n"); |
| return -EIO; |
| } |
| |
| memcpy(conn->vsub->classmark.classmark2, classmark2, classmark2_len); |
| conn->vsub->classmark.classmark2_len = classmark2_len; |
| |
| ran_conn_complete_layer_3(conn); |
| return 0; |
| } |
| |
| /* Receive a CM Re-establish Request */ |
| static int gsm48_rx_cm_reest_req(struct ran_conn *conn, struct msgb *msg) |
| { |
| uint8_t mi_type; |
| char mi_string[GSM48_MI_SIZE]; |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| |
| uint8_t classmark2_len = gh->data[1]; |
| uint8_t *classmark2 = gh->data+2; |
| uint8_t mi_len = *(classmark2 + classmark2_len); |
| uint8_t *mi = (classmark2 + classmark2_len + 1); |
| |
| gsm48_mi_to_string(mi_string, sizeof(mi_string), mi, mi_len); |
| mi_type = mi[0] & GSM_MI_TYPE_MASK; |
| DEBUGP(DMM, "<- CM RE-ESTABLISH REQUEST MI(%s)=%s\n", gsm48_mi_type_name(mi_type), mi_string); |
| |
| /* we don't support CM call re-establishment */ |
| return msc_gsm48_tx_mm_serv_rej(conn, GSM48_REJECT_SRV_OPT_NOT_SUPPORTED); |
| } |
| |
| static int gsm48_rx_mm_imsi_detach_ind(struct ran_conn *conn, struct msgb *msg) |
| { |
| struct gsm_network *network = conn->network; |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| struct gsm48_imsi_detach_ind *idi = |
| (struct gsm48_imsi_detach_ind *) gh->data; |
| uint8_t mi_type = idi->mi[0] & GSM_MI_TYPE_MASK; |
| char mi_string[GSM48_MI_SIZE]; |
| struct vlr_subscr *vsub = NULL; |
| |
| gsm48_mi_to_string(mi_string, sizeof(mi_string), idi->mi, idi->mi_len); |
| DEBUGP(DMM, "IMSI DETACH INDICATION: MI(%s)=%s\n", |
| gsm48_mi_type_name(mi_type), mi_string); |
| |
| rate_ctr_inc(&network->msc_ctrs->ctr[MSC_CTR_LOC_UPDATE_TYPE_DETACH]); |
| |
| switch (mi_type) { |
| case GSM_MI_TYPE_TMSI: |
| vsub = vlr_subscr_find_by_tmsi(network->vlr, |
| tmsi_from_string(mi_string)); |
| break; |
| case GSM_MI_TYPE_IMSI: |
| vsub = vlr_subscr_find_by_imsi(network->vlr, mi_string); |
| break; |
| case GSM_MI_TYPE_IMEI: |
| case GSM_MI_TYPE_IMEISV: |
| /* no sim card... FIXME: what to do ? */ |
| LOGP(DMM, LOGL_ERROR, "MI(%s)=%s: unimplemented mobile identity type\n", |
| gsm48_mi_type_name(mi_type), mi_string); |
| break; |
| default: |
| LOGP(DMM, LOGL_ERROR, "MI(%s)=%s: unknown mobile identity type\n", |
| gsm48_mi_type_name(mi_type), mi_string); |
| break; |
| } |
| |
| if (!vsub) { |
| LOGP(DMM, LOGL_ERROR, "IMSI DETACH for unknown subscriber MI(%s)=%s\n", |
| gsm48_mi_type_name(mi_type), mi_string); |
| } else { |
| LOGP(DMM, LOGL_INFO, "IMSI DETACH for %s\n", vlr_subscr_name(vsub)); |
| |
| if (vsub->cs.is_paging) |
| subscr_paging_cancel(vsub, GSM_PAGING_EXPIRED); |
| |
| /* We already got Classmark 1 during Location Updating ... but well, ok */ |
| vsub->classmark.classmark1 = idi->classmark1; |
| |
| vlr_subscr_rx_imsi_detach(vsub); |
| osmo_signal_dispatch(SS_SUBSCR, S_SUBSCR_DETACHED, vsub); |
| vlr_subscr_put(vsub); |
| } |
| |
| ran_conn_close(conn, 0); |
| return 0; |
| } |
| |
| static int gsm48_rx_mm_status(struct msgb *msg) |
| { |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| |
| DEBUGP(DMM, "MM STATUS (reject cause 0x%02x)\n", gh->data[0]); |
| |
| return 0; |
| } |
| |
| static int parse_gsm_auth_resp(uint8_t *res, uint8_t *res_len, |
| struct ran_conn *conn, |
| struct msgb *msg) |
| { |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| struct gsm48_auth_resp *ar = (struct gsm48_auth_resp*) gh->data; |
| |
| if (msgb_l3len(msg) < sizeof(*gh) + sizeof(*ar)) { |
| LOGP(DMM, LOGL_ERROR, |
| "%s: MM AUTHENTICATION RESPONSE:" |
| " l3 length invalid: %u\n", |
| vlr_subscr_name(conn->vsub), msgb_l3len(msg)); |
| return -EINVAL; |
| } |
| |
| *res_len = sizeof(ar->sres); |
| memcpy(res, ar->sres, sizeof(ar->sres)); |
| return 0; |
| } |
| |
| static int parse_umts_auth_resp(uint8_t *res, uint8_t *res_len, |
| struct ran_conn *conn, |
| struct msgb *msg) |
| { |
| struct gsm48_hdr *gh; |
| uint8_t *data; |
| uint8_t iei; |
| uint8_t ie_len; |
| unsigned int data_len; |
| |
| /* First parse the GSM part */ |
| if (parse_gsm_auth_resp(res, res_len, conn, msg)) |
| return -EINVAL; |
| OSMO_ASSERT(*res_len == 4); |
| |
| /* Then add the extended res part */ |
| gh = msgb_l3(msg); |
| data = gh->data + sizeof(struct gsm48_auth_resp); |
| data_len = msgb_l3len(msg) - (data - (uint8_t*)msgb_l3(msg)); |
| |
| if (data_len < 3) { |
| LOGP(DMM, LOGL_ERROR, |
| "%s: MM AUTHENTICATION RESPONSE:" |
| " l3 length invalid: %u\n", |
| vlr_subscr_name(conn->vsub), msgb_l3len(msg)); |
| return -EINVAL; |
| } |
| |
| iei = data[0]; |
| ie_len = data[1]; |
| if (iei != GSM48_IE_AUTH_RES_EXT) { |
| LOGP(DMM, LOGL_ERROR, |
| "%s: MM R99 AUTHENTICATION RESPONSE:" |
| " expected IEI 0x%02x, got 0x%02x\n", |
| vlr_subscr_name(conn->vsub), |
| GSM48_IE_AUTH_RES_EXT, iei); |
| return -EINVAL; |
| } |
| |
| if (ie_len > 12) { |
| LOGP(DMM, LOGL_ERROR, |
| "%s: MM R99 AUTHENTICATION RESPONSE:" |
| " extended Auth Resp IE 0x%02x is too large: %u bytes\n", |
| vlr_subscr_name(conn->vsub), GSM48_IE_AUTH_RES_EXT, ie_len); |
| return -EINVAL; |
| } |
| |
| *res_len += ie_len; |
| memcpy(res + 4, &data[2], ie_len); |
| return 0; |
| } |
| |
| /* Chapter 9.2.3: Authentication Response */ |
| static int gsm48_rx_mm_auth_resp(struct ran_conn *conn, struct msgb *msg) |
| { |
| uint8_t res[16]; |
| uint8_t res_len; |
| int rc; |
| bool is_umts; |
| |
| if (!conn->vsub) { |
| LOGP(DMM, LOGL_ERROR, |
| "MM AUTHENTICATION RESPONSE: invalid: no subscriber\n"); |
| ran_conn_close(conn, GSM_CAUSE_AUTH_FAILED); |
| return -EINVAL; |
| } |
| |
| is_umts = (msgb_l3len(msg) > sizeof(struct gsm48_hdr) + sizeof(struct gsm48_auth_resp)); |
| |
| if (is_umts) |
| rc = parse_umts_auth_resp(res, &res_len, conn, msg); |
| else |
| rc = parse_gsm_auth_resp(res, &res_len, conn, msg); |
| |
| if (rc) { |
| LOGP(DMM, LOGL_ERROR, |
| "%s: MM AUTHENTICATION RESPONSE: invalid: parsing %s AKA Auth Response" |
| " failed with rc=%d; dispatching zero length SRES/RES to trigger failure\n", |
| vlr_subscr_name(conn->vsub), is_umts ? "UMTS" : "GSM", rc); |
| memset(res, 0, sizeof(res)); |
| res_len = 0; |
| } |
| |
| DEBUGP(DMM, "%s: MM %s AUTHENTICATION RESPONSE (%s = %s)\n", |
| vlr_subscr_name(conn->vsub), |
| is_umts ? "UMTS" : "GSM", is_umts ? "res" : "sres", |
| osmo_hexdump_nospc(res, res_len)); |
| |
| return vlr_subscr_rx_auth_resp(conn->vsub, classmark_is_r99(&conn->vsub->classmark), |
| conn->via_ran == OSMO_RAT_UTRAN_IU, |
| res, res_len); |
| } |
| |
| static int gsm48_rx_mm_auth_fail(struct ran_conn *conn, struct msgb *msg) |
| { |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| uint8_t cause; |
| uint8_t auts_tag; |
| uint8_t auts_len; |
| uint8_t *auts; |
| |
| if (!conn->vsub) { |
| LOGP(DMM, LOGL_ERROR, |
| "MM R99 AUTHENTICATION FAILURE: invalid: no subscriber\n"); |
| ran_conn_close(conn, GSM_CAUSE_AUTH_FAILED); |
| return -EINVAL; |
| } |
| |
| if (msgb_l3len(msg) < sizeof(*gh) + 1) { |
| LOGP(DMM, LOGL_ERROR, |
| "%s: MM R99 AUTHENTICATION FAILURE:" |
| " l3 length invalid: %u\n", |
| vlr_subscr_name(conn->vsub), msgb_l3len(msg)); |
| ran_conn_close(conn, GSM_CAUSE_AUTH_FAILED); |
| return -EINVAL; |
| } |
| |
| cause = gh->data[0]; |
| |
| if (cause != GSM48_REJECT_SYNCH_FAILURE) { |
| LOGP(DMM, LOGL_INFO, |
| "%s: MM R99 AUTHENTICATION FAILURE: cause 0x%0x\n", |
| vlr_subscr_name(conn->vsub), cause); |
| vlr_subscr_rx_auth_fail(conn->vsub, NULL); |
| return 0; |
| } |
| |
| /* This is a Synch Failure procedure, which should pass an AUTS to |
| * resynchronize the sequence nr with the HLR. Expecting exactly one |
| * TLV with 14 bytes of AUTS. */ |
| |
| if (msgb_l3len(msg) < sizeof(*gh) + 1 + 2) { |
| LOGP(DMM, LOGL_INFO, |
| "%s: MM R99 AUTHENTICATION FAILURE:" |
| " invalid Synch Failure: missing AUTS IE\n", |
| vlr_subscr_name(conn->vsub)); |
| ran_conn_close(conn, GSM_CAUSE_AUTH_FAILED); |
| return -EINVAL; |
| } |
| |
| auts_tag = gh->data[1]; |
| auts_len = gh->data[2]; |
| auts = &gh->data[3]; |
| |
| if (auts_tag != GSM48_IE_AUTS |
| || auts_len != 14) { |
| LOGP(DMM, LOGL_INFO, |
| "%s: MM R99 AUTHENTICATION FAILURE:" |
| " invalid Synch Failure:" |
| " expected AUTS IE 0x%02x of 14 bytes," |
| " got IE 0x%02x of %u bytes\n", |
| vlr_subscr_name(conn->vsub), |
| GSM48_IE_AUTS, auts_tag, auts_len); |
| ran_conn_close(conn, GSM_CAUSE_AUTH_FAILED); |
| return -EINVAL; |
| } |
| |
| if (msgb_l3len(msg) < sizeof(*gh) + 1 + 2 + auts_len) { |
| LOGP(DMM, LOGL_INFO, |
| "%s: MM R99 AUTHENTICATION FAILURE:" |
| " invalid Synch Failure msg: message truncated (%u)\n", |
| vlr_subscr_name(conn->vsub), msgb_l3len(msg)); |
| ran_conn_close(conn, GSM_CAUSE_AUTH_FAILED); |
| return -EINVAL; |
| } |
| |
| /* We have an AUTS IE with exactly 14 bytes of AUTS and the msgb is |
| * large enough. */ |
| |
| DEBUGP(DMM, "%s: MM R99 AUTHENTICATION SYNCH (AUTS = %s)\n", |
| vlr_subscr_name(conn->vsub), osmo_hexdump_nospc(auts, 14)); |
| |
| return vlr_subscr_rx_auth_fail(conn->vsub, auts); |
| } |
| |
| static int gsm48_rx_mm_tmsi_reall_compl(struct ran_conn *conn) |
| { |
| DEBUGP(DMM, "TMSI Reallocation Completed. Subscriber: %s\n", |
| vlr_subscr_name(conn->vsub)); |
| if (!conn->vsub) { |
| LOGP(DMM, LOGL_ERROR, |
| "Rx MM TMSI Reallocation Complete: invalid: no subscriber\n"); |
| return -EINVAL; |
| } |
| return vlr_subscr_rx_tmsi_reall_compl(conn->vsub); |
| } |
| |
| /* Receive a GSM 04.08 Mobility Management (MM) message */ |
| static int gsm0408_rcv_mm(struct ran_conn *conn, struct msgb *msg) |
| { |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| int rc = 0; |
| |
| switch (gsm48_hdr_msg_type(gh)) { |
| case GSM48_MT_MM_LOC_UPD_REQUEST: |
| rc = mm_rx_loc_upd_req(conn, msg); |
| break; |
| case GSM48_MT_MM_ID_RESP: |
| rc = mm_rx_id_resp(conn, msg); |
| break; |
| case GSM48_MT_MM_CM_SERV_REQ: |
| rc = gsm48_rx_mm_serv_req(conn, msg); |
| break; |
| case GSM48_MT_MM_STATUS: |
| rc = gsm48_rx_mm_status(msg); |
| break; |
| case GSM48_MT_MM_TMSI_REALL_COMPL: |
| rc = gsm48_rx_mm_tmsi_reall_compl(conn); |
| break; |
| case GSM48_MT_MM_IMSI_DETACH_IND: |
| rc = gsm48_rx_mm_imsi_detach_ind(conn, msg); |
| break; |
| case GSM48_MT_MM_CM_REEST_REQ: |
| rc = gsm48_rx_cm_reest_req(conn, msg); |
| break; |
| case GSM48_MT_MM_AUTH_RESP: |
| rc = gsm48_rx_mm_auth_resp(conn, msg); |
| break; |
| case GSM48_MT_MM_AUTH_FAIL: |
| rc = gsm48_rx_mm_auth_fail(conn, msg); |
| break; |
| default: |
| LOGP(DMM, LOGL_NOTICE, "Unknown GSM 04.08 MM msg type 0x%02x\n", |
| gh->msg_type); |
| break; |
| } |
| |
| return rc; |
| } |
| |
| /* Receive a PAGING RESPONSE message from the MS */ |
| static int gsm48_rx_rr_pag_resp(struct ran_conn *conn, struct msgb *msg) |
| { |
| struct gsm_network *net = conn->network; |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| struct gsm48_pag_resp *pr = |
| (struct gsm48_pag_resp *)gh->data; |
| uint8_t classmark2_len = gh->data[1]; |
| uint8_t *classmark2 = gh->data+2; |
| uint8_t *mi_lv = classmark2 + classmark2_len; |
| struct osmo_location_area_id lai; |
| bool is_utran; |
| |
| lai.plmn = conn->network->plmn; |
| lai.lac = conn->lac; |
| |
| if (ran_conn_is_establishing_auth_ciph(conn)) { |
| LOGP(DMM, LOGL_ERROR, |
| "Ignoring Paging Response, conn already busy establishing authenticity\n"); |
| return 0; |
| } |
| |
| if (ran_conn_is_accepted(conn)) { |
| LOGP(DMM, LOGL_ERROR, "Ignoring Paging Response, conn already established\n"); |
| return 0; |
| } |
| |
| conn->complete_layer3_type = COMPLETE_LAYER3_PAGING_RESP; |
| ran_conn_update_id_from_mi(conn, mi_lv + 1, *mi_lv); |
| LOG_RAN_CONN_CAT(conn, DRR, LOGL_DEBUG, "PAGING RESPONSE\n"); |
| |
| is_utran = (conn->via_ran == OSMO_RAT_UTRAN_IU); |
| vlr_proc_acc_req(conn->fi, |
| RAN_CONN_E_ACCEPTED, RAN_CONN_E_CN_CLOSE, NULL, |
| net->vlr, conn, |
| VLR_PR_ARQ_T_PAGING_RESP, mi_lv, &lai, |
| is_utran || conn->network->authentication_required, |
| is_utran || conn->network->a5_encryption_mask > 0x01, |
| pr->key_seq, |
| classmark2_is_r99(classmark2, classmark2_len), |
| is_utran); |
| |
| /* From vlr_proc_acc_req() we expect an implicit dispatch of PR_ARQ_E_START we expect |
| * msc_vlr_subscr_assoc() to already have been called and completed. Has an error occured? */ |
| if (!conn->vsub) { |
| LOG_RAN_CONN(conn, LOGL_ERROR, "subscriber not allowed to do a Paging Response\n"); |
| return -EIO; |
| } |
| |
| memcpy(conn->vsub->classmark.classmark2, classmark2, classmark2_len); |
| conn->vsub->classmark.classmark2_len = classmark2_len; |
| |
| ran_conn_complete_layer_3(conn); |
| return 0; |
| } |
| |
| static int gsm48_rx_rr_app_info(struct ran_conn *conn, struct msgb *msg) |
| { |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| uint8_t apdu_id_flags; |
| uint8_t apdu_len; |
| uint8_t *apdu_data; |
| |
| apdu_id_flags = gh->data[0]; |
| apdu_len = gh->data[1]; |
| apdu_data = gh->data+2; |
| |
| DEBUGP(DRR, "RX APPLICATION INFO id/flags=0x%02x apdu_len=%u apdu=%s\n", |
| apdu_id_flags, apdu_len, osmo_hexdump(apdu_data, apdu_len)); |
| |
| /* we're not using the app info blob anywhere, so ignore. */ |
| #if 0 |
| return db_apdu_blob_store(conn->subscr, apdu_id_flags, apdu_len, apdu_data); |
| #else |
| return 0; |
| #endif |
| } |
| |
| /* Receive a GSM 04.08 Radio Resource (RR) message */ |
| static int gsm0408_rcv_rr(struct ran_conn *conn, struct msgb *msg) |
| { |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| int rc = 0; |
| |
| switch (gh->msg_type) { |
| case GSM48_MT_RR_PAG_RESP: |
| rc = gsm48_rx_rr_pag_resp(conn, msg); |
| break; |
| case GSM48_MT_RR_APP_INFO: |
| rc = gsm48_rx_rr_app_info(conn, msg); |
| break; |
| default: |
| LOGP(DRR, LOGL_NOTICE, "MSC: Unimplemented %s GSM 04.08 RR " |
| "message\n", gsm48_rr_msg_name(gh->msg_type)); |
| break; |
| } |
| |
| return rc; |
| } |
| |
| int gsm48_send_rr_app_info(struct ran_conn *conn, uint8_t apdu_id, |
| uint8_t apdu_len, const uint8_t *apdu) |
| { |
| struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 APP INF"); |
| struct gsm48_hdr *gh; |
| |
| DEBUGP(DRR, "TX APPLICATION INFO id=0x%02x, len=%u\n", |
| apdu_id, apdu_len); |
| |
| gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 2 + apdu_len); |
| gh->proto_discr = GSM48_PDISC_RR; |
| gh->msg_type = GSM48_MT_RR_APP_INFO; |
| gh->data[0] = apdu_id; |
| gh->data[1] = apdu_len; |
| memcpy(gh->data+2, apdu, apdu_len); |
| |
| return gsm48_conn_sendmsg(msg, conn, NULL); |
| } |
| |
| static bool msg_is_initially_permitted(const struct gsm48_hdr *hdr) |
| { |
| uint8_t pdisc = gsm48_hdr_pdisc(hdr); |
| uint8_t msg_type = gsm48_hdr_msg_type(hdr); |
| |
| switch (pdisc) { |
| case GSM48_PDISC_MM: |
| switch (msg_type) { |
| case GSM48_MT_MM_LOC_UPD_REQUEST: |
| case GSM48_MT_MM_CM_SERV_REQ: |
| case GSM48_MT_MM_CM_REEST_REQ: |
| case GSM48_MT_MM_AUTH_RESP: |
| case GSM48_MT_MM_AUTH_FAIL: |
| case GSM48_MT_MM_ID_RESP: |
| case GSM48_MT_MM_TMSI_REALL_COMPL: |
| case GSM48_MT_MM_IMSI_DETACH_IND: |
| return true; |
| default: |
| break; |
| } |
| break; |
| case GSM48_PDISC_RR: |
| switch (msg_type) { |
| /* GSM48_MT_RR_CIPH_M_COMPL is actually handled in bssmap_rx_ciph_compl() and gets redirected in the |
| * BSSAP layer to ran_conn_cipher_mode_compl() (before this here is reached) */ |
| case GSM48_MT_RR_PAG_RESP: |
| return true; |
| default: |
| break; |
| } |
| break; |
| default: |
| break; |
| } |
| |
| return false; |
| } |
| |
| void cm_service_request_concludes(struct ran_conn *conn, |
| struct msgb *msg) |
| { |
| |
| /* If a CM Service Request was received before, this is the request the |
| * conn was opened for. No need to wait for further messages. */ |
| |
| if (!conn->received_cm_service_request) |
| return; |
| |
| if (log_check_level(DMM, LOGL_DEBUG)) { |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| uint8_t pdisc = gsm48_hdr_pdisc(gh); |
| uint8_t msg_type = gsm48_hdr_msg_type(gh); |
| |
| DEBUGP(DMM, "%s: rx msg %s:" |
| " received_cm_service_request changes to false\n", |
| vlr_subscr_name(conn->vsub), |
| gsm48_pdisc_msgtype_name(pdisc, msg_type)); |
| } |
| conn->received_cm_service_request = false; |
| ran_conn_put(conn, RAN_CONN_USE_CM_SERVICE); |
| } |
| |
| /* TS 24.007 11.2.3.2.3 Message Type Octet / Duplicate Detection */ |
| int gsm0407_pdisc_ctr_bin(uint8_t pdisc) |
| { |
| switch (pdisc) { |
| case GSM48_PDISC_MM: |
| case GSM48_PDISC_CC: |
| case GSM48_PDISC_NC_SS: |
| return 0; |
| case GSM48_PDISC_GROUP_CC: |
| return 1; |
| case GSM48_PDISC_BCAST_CC: |
| return 2; |
| case GSM48_PDISC_LOC: |
| return 3; |
| default: |
| return -1; |
| } |
| } |
| |
| /* extract the N(SD) and return the modulo value for a R98 message */ |
| static uint8_t gsm0407_determine_nsd_ret_modulo_r99(uint8_t pdisc, uint8_t msg_type, uint8_t *n_sd) |
| { |
| switch (pdisc) { |
| case GSM48_PDISC_MM: |
| case GSM48_PDISC_CC: |
| case GSM48_PDISC_NC_SS: |
| *n_sd = (msg_type >> 6) & 0x3; |
| return 4; |
| case GSM48_PDISC_GROUP_CC: |
| case GSM48_PDISC_BCAST_CC: |
| case GSM48_PDISC_LOC: |
| *n_sd = (msg_type >> 6) & 0x1; |
| return 2; |
| default: |
| /* no sequence number, we cannot detect dups */ |
| return 0; |
| } |
| } |
| |
| /* extract the N(SD) and return the modulo value for a R99 message */ |
| static uint8_t gsm0407_determine_nsd_ret_modulo_r98(uint8_t pdisc, uint8_t msg_type, uint8_t *n_sd) |
| { |
| switch (pdisc) { |
| case GSM48_PDISC_MM: |
| case GSM48_PDISC_CC: |
| case GSM48_PDISC_NC_SS: |
| case GSM48_PDISC_GROUP_CC: |
| case GSM48_PDISC_BCAST_CC: |
| case GSM48_PDISC_LOC: |
| *n_sd = (msg_type >> 6) & 0x1; |
| return 2; |
| default: |
| /* no sequence number, we cannot detect dups */ |
| return 0; |
| } |
| } |
| |
| /* TS 24.007 11.2.3.2 Message Type Octet / Duplicate Detection */ |
| static bool gsm0407_is_duplicate(struct ran_conn *conn, struct msgb *msg) |
| { |
| struct gsm48_hdr *gh; |
| uint8_t pdisc; |
| uint8_t n_sd, modulo; |
| int bin; |
| |
| gh = msgb_l3(msg); |
| pdisc = gsm48_hdr_pdisc(gh); |
| |
| if (conn->vsub && classmark_is_r99(&conn->vsub->classmark)) { |
| modulo = gsm0407_determine_nsd_ret_modulo_r99(pdisc, gh->msg_type, &n_sd); |
| } else { /* pre R99 */ |
| modulo = gsm0407_determine_nsd_ret_modulo_r98(pdisc, gh->msg_type, &n_sd); |
| } |
| if (modulo == 0) |
| return false; |
| bin = gsm0407_pdisc_ctr_bin(pdisc); |
| if (bin < 0) |
| return false; |
| |
| OSMO_ASSERT(bin < ARRAY_SIZE(conn->n_sd_next)); |
| if (n_sd != conn->n_sd_next[bin]) { |
| /* not what we expected: duplicate */ |
| return true; |
| } else { |
| /* as expected: no dup; update expected counter for next message */ |
| conn->n_sd_next[bin] = (n_sd + 1) % modulo; |
| return false; |
| } |
| } |
| |
| extern int gsm0408_rcv_cc(struct ran_conn *conn, struct msgb *msg); |
| |
| /* Main entry point for GSM 04.08/44.008 Layer 3 data (e.g. from the BSC). */ |
| int gsm0408_dispatch(struct ran_conn *conn, struct msgb *msg) |
| { |
| struct gsm48_hdr *gh; |
| uint8_t pdisc; |
| int rc = 0; |
| |
| OSMO_ASSERT(msg->l3h); |
| OSMO_ASSERT(conn); |
| OSMO_ASSERT(msg); |
| |
| gh = msgb_l3(msg); |
| pdisc = gsm48_hdr_pdisc(gh); |
| |
| if (gsm0407_is_duplicate(conn, msg)) { |
| LOGP(DRLL, LOGL_NOTICE, "%s: Discarding duplicate L3 message\n", |
| (conn && conn->vsub) ? vlr_subscr_name(conn->vsub) : "UNKNOWN"); |
| return 0; |
| } |
| |
| LOGP(DRLL, LOGL_DEBUG, "Dispatching 04.08 message %s (0x%x:0x%x)\n", |
| gsm48_pdisc_msgtype_name(pdisc, gsm48_hdr_msg_type(gh)), |
| pdisc, gsm48_hdr_msg_type(gh)); |
| |
| if (!ran_conn_is_accepted(conn) |
| && !msg_is_initially_permitted(gh)) { |
| LOGP(DRLL, LOGL_ERROR, |
| "subscr %s: Message not permitted for initial conn: %s\n", |
| vlr_subscr_name(conn->vsub), |
| gsm48_pdisc_msgtype_name(pdisc, gsm48_hdr_msg_type(gh))); |
| return -EACCES; |
| } |
| |
| if (conn->vsub && conn->vsub->cs.attached_via_ran != conn->via_ran) { |
| LOGP(DMM, LOGL_ERROR, |
| "%s: Illegal situation: RAN type mismatch:" |
| " attached via %s, received message via %s\n", |
| vlr_subscr_name(conn->vsub), |
| osmo_rat_type_name(conn->vsub->cs.attached_via_ran), |
| osmo_rat_type_name(conn->via_ran)); |
| return -EACCES; |
| } |
| |
| #if 0 |
| if (silent_call_reroute(conn, msg)) |
| return silent_call_rx(conn, msg); |
| #endif |
| |
| switch (pdisc) { |
| case GSM48_PDISC_CC: |
| rc = gsm0408_rcv_cc(conn, msg); |
| break; |
| case GSM48_PDISC_MM: |
| rc = gsm0408_rcv_mm(conn, msg); |
| break; |
| case GSM48_PDISC_RR: |
| rc = gsm0408_rcv_rr(conn, msg); |
| break; |
| case GSM48_PDISC_SMS: |
| rc = gsm0411_rcv_sms(conn, msg); |
| break; |
| case GSM48_PDISC_MM_GPRS: |
| case GSM48_PDISC_SM_GPRS: |
| LOGP(DRLL, LOGL_NOTICE, "Unimplemented " |
| "GSM 04.08 discriminator 0x%02x\n", pdisc); |
| rc = -ENOTSUP; |
| break; |
| case GSM48_PDISC_NC_SS: |
| rc = gsm0911_rcv_nc_ss(conn, msg); |
| break; |
| case GSM48_PDISC_TEST: |
| rc = gsm0414_rcv_test(conn, msg); |
| break; |
| default: |
| LOGP(DRLL, LOGL_NOTICE, "Unknown " |
| "GSM 04.08 discriminator 0x%02x\n", pdisc); |
| rc = -EINVAL; |
| break; |
| } |
| |
| return rc; |
| } |
| |
| /*********************************************************************** |
| * VLR integration |
| ***********************************************************************/ |
| |
| /* VLR asks us to send an authentication request */ |
| static int msc_vlr_tx_auth_req(void *msc_conn_ref, struct vlr_auth_tuple *at, |
| bool send_autn) |
| { |
| struct ran_conn *conn = msc_conn_ref; |
| return gsm48_tx_mm_auth_req(conn, at->vec.rand, |
| send_autn? at->vec.autn : NULL, |
| at->key_seq); |
| } |
| |
| /* VLR asks us to send an authentication reject */ |
| static int msc_vlr_tx_auth_rej(void *msc_conn_ref) |
| { |
| struct ran_conn *conn = msc_conn_ref; |
| return gsm48_tx_mm_auth_rej(conn); |
| } |
| |
| /* VLR asks us to transmit an Identity Request of given type */ |
| static int msc_vlr_tx_id_req(void *msc_conn_ref, uint8_t mi_type) |
| { |
| struct ran_conn *conn = msc_conn_ref; |
| return mm_tx_identity_req(conn, mi_type); |
| } |
| |
| /* VLR asks us to transmit a Location Update Accept */ |
| static int msc_vlr_tx_lu_acc(void *msc_conn_ref, uint32_t send_tmsi) |
| { |
| struct ran_conn *conn = msc_conn_ref; |
| return gsm0408_loc_upd_acc(conn, send_tmsi); |
| } |
| |
| /* VLR asks us to transmit a Location Update Reject */ |
| static int msc_vlr_tx_lu_rej(void *msc_conn_ref, enum gsm48_reject_value cause) |
| { |
| struct ran_conn *conn = msc_conn_ref; |
| return gsm0408_loc_upd_rej(conn, cause); |
| } |
| |
| /* VLR asks us to transmit a CM Service Accept */ |
| static int msc_vlr_tx_cm_serv_acc(void *msc_conn_ref) |
| { |
| struct ran_conn *conn = msc_conn_ref; |
| return msc_gsm48_tx_mm_serv_ack(conn); |
| } |
| |
| static int msc_vlr_tx_common_id(void *msc_conn_ref) |
| { |
| struct ran_conn *conn = msc_conn_ref; |
| return msc_tx_common_id(conn); |
| } |
| |
| /* VLR asks us to transmit MM info. */ |
| static int msc_vlr_tx_mm_info(void *msc_conn_ref) |
| { |
| struct ran_conn *conn = msc_conn_ref; |
| if (!conn->network->send_mm_info) |
| return 0; |
| return gsm48_tx_mm_info(conn); |
| } |
| |
| /* VLR asks us to transmit a CM Service Reject */ |
| static int msc_vlr_tx_cm_serv_rej(void *msc_conn_ref, enum gsm48_reject_value cause) |
| { |
| struct ran_conn *conn = msc_conn_ref; |
| int rc; |
| |
| rc = msc_gsm48_tx_mm_serv_rej(conn, cause); |
| |
| if (conn->received_cm_service_request) { |
| conn->received_cm_service_request = false; |
| ran_conn_put(conn, RAN_CONN_USE_CM_SERVICE); |
| } |
| |
| return rc; |
| } |
| |
| /* For msc_vlr_set_ciph_mode() */ |
| osmo_static_assert(sizeof(((struct gsm0808_encrypt_info*)0)->key) >= sizeof(((struct osmo_auth_vector*)0)->kc), |
| gsm0808_encrypt_info_key_fits_osmo_auth_vec_kc); |
| |
| int ran_conn_geran_set_cipher_mode(struct ran_conn *conn, bool umts_aka, bool retrieve_imeisv) |
| { |
| struct gsm_network *net; |
| struct gsm0808_encrypt_info ei; |
| int i, j = 0; |
| int request_classmark = 0; |
| int request_classmark_for_a5_n = 0; |
| struct vlr_auth_tuple *tuple; |
| |
| if (!conn || !conn->vsub || !conn->vsub->last_tuple) { |
| /* This should really never happen, because we checked this in msc_vlr_set_ciph_mode() |
| * already. */ |
| LOGP(DMM, LOGL_ERROR, "Internal error: missing state during Ciphering Mode Command\n"); |
| return -EINVAL; |
| } |
| |
| net = conn->network; |
| tuple = conn->vsub->last_tuple; |
| |
| for (i = 0; i < 8; i++) { |
| int supported; |
| |
| /* A5/n permitted by osmo-msc.cfg? */ |
| if (!(net->a5_encryption_mask & (1 << i))) |
| continue; |
| |
| /* A5/n supported by MS? */ |
| supported = classmark_supports_a5(&conn->vsub->classmark, i); |
| if (supported == 1) { |
| ei.perm_algo[j++] = vlr_ciph_to_gsm0808_alg_id(i); |
| /* A higher A5/n is supported, so no need to request a Classmark |
| * for support of a lesser A5/n. */ |
| request_classmark = 0; |
| } else if (supported < 0) { |
| request_classmark = -supported; |
| request_classmark_for_a5_n = i; |
| } |
| } |
| ei.perm_algo_len = j; |
| |
| if (request_classmark) { |
| /* The highest A5/n as from osmo-msc.cfg might be available, but we are |
| * still missing the Classmark information for that from the MS. First |
| * ask for that. */ |
| LOGP(DMM, LOGL_DEBUG, "%s: to determine whether A5/%d is supported," |
| " first ask for a Classmark Update to obtain Classmark %d\n", |
| vlr_subscr_name(conn->vsub), request_classmark_for_a5_n, |
| request_classmark); |
| |
| return ran_conn_classmark_request_then_cipher_mode_cmd(conn, umts_aka, retrieve_imeisv); |
| } |
| |
| if (ei.perm_algo_len == 0) { |
| LOGP(DMM, LOGL_ERROR, "%s: cannot start ciphering, no intersection " |
| "between MSC-configured and MS-supported A5 algorithms. MSC: %x MS: %s\n", |
| vlr_subscr_name(conn->vsub), net->a5_encryption_mask, |
| classmark_a5_name(&conn->vsub->classmark)); |
| return -ENOTSUP; |
| } |
| |
| DEBUGP(DMM, "-> CIPHER MODE COMMAND %s\n", vlr_subscr_name(conn->vsub)); |
| |
| tuple = conn->vsub->last_tuple; |
| |
| /* In case of UMTS AKA, the Kc for ciphering must be derived from the 3G auth |
| * tokens. tuple->vec.kc was calculated from the GSM algorithm and is not |
| * necessarily a match for the UMTS AKA tokens. */ |
| if (umts_aka) |
| osmo_auth_c3(ei.key, tuple->vec.ck, tuple->vec.ik); |
| else |
| memcpy(ei.key, tuple->vec.kc, sizeof(tuple->vec.kc)); |
| ei.key_len = sizeof(tuple->vec.kc); |
| |
| conn->geran_encr = (struct geran_encr){}; |
| if (ei.key_len <= sizeof(conn->geran_encr.key)) { |
| memcpy(conn->geran_encr.key, ei.key, ei.key_len); |
| conn->geran_encr.key_len = ei.key_len; |
| } |
| /* conn->geran_encr.alg_id remains unknown until we receive a Cipher Mode Complete from the BSC */ |
| |
| return a_iface_tx_cipher_mode(conn, &ei, retrieve_imeisv); |
| } |
| |
| /* VLR asks us to start using ciphering. |
| * (Keep non-static to allow regression testing on this function.) */ |
| int msc_vlr_set_ciph_mode(void *msc_conn_ref, |
| bool umts_aka, |
| bool retrieve_imeisv) |
| { |
| struct ran_conn *conn = msc_conn_ref; |
| struct vlr_subscr *vsub; |
| struct vlr_auth_tuple *tuple; |
| |
| if (!conn || !conn->vsub) { |
| LOGP(DMM, LOGL_ERROR, "Cannot send Ciphering Mode Command to" |
| " NULL conn/subscriber"); |
| return -EINVAL; |
| } |
| |
| vsub = conn->vsub; |
| tuple = vsub->last_tuple; |
| |
| if (!tuple) { |
| LOGP(DMM, LOGL_ERROR, "subscr %s: Cannot send Ciphering Mode" |
| " Command: no auth tuple available\n", |
| vlr_subscr_name(vsub)); |
| return -EINVAL; |
| } |
| |
| switch (conn->via_ran) { |
| case OSMO_RAT_GERAN_A: |
| return ran_conn_geran_set_cipher_mode(conn, umts_aka, retrieve_imeisv); |
| |
| case OSMO_RAT_UTRAN_IU: |
| #ifdef BUILD_IU |
| DEBUGP(DMM, "-> SECURITY MODE CONTROL %s\n", |
| vlr_subscr_name(conn->vsub)); |
| return ranap_iu_tx_sec_mode_cmd(conn->iu.ue_ctx, &tuple->vec, 0, 1); |
| #else |
| LOGP(DMM, LOGL_ERROR, "Cannot send Security Mode Control over OSMO_RAT_UTRAN_IU," |
| " built without Iu support\n"); |
| return -ENOTSUP; |
| #endif |
| |
| default: |
| break; |
| } |
| LOGP(DMM, LOGL_ERROR, |
| "%s: cannot start ciphering, unknown RAN type %d\n", |
| vlr_subscr_name(conn->vsub), conn->via_ran); |
| return -ENOTSUP; |
| } |
| |
| void ran_conn_rx_sec_mode_compl(struct ran_conn *conn) |
| { |
| struct vlr_ciph_result vlr_res = {}; |
| |
| if (!conn || !conn->vsub) { |
| LOGP(DMM, LOGL_ERROR, |
| "Rx Security Mode Complete for invalid conn\n"); |
| return; |
| } |
| |
| DEBUGP(DMM, "<- SECURITY MODE COMPLETE %s\n", |
| vlr_subscr_name(conn->vsub)); |
| |
| vlr_res.cause = VLR_CIPH_COMPL; |
| vlr_subscr_rx_ciph_res(conn->vsub, &vlr_res); |
| } |
| |
| /* VLR informs us that the subscriber data has somehow been modified */ |
| static void msc_vlr_subscr_update(struct vlr_subscr *subscr) |
| { |
| LOGVSUBP(LOGL_NOTICE, subscr, "VLR: update for IMSI=%s (MSISDN=%s, used=%d)\n", |
| subscr->imsi, subscr->msisdn, subscr->use_count); |
| ran_conn_update_id_for_vsub(subscr); |
| } |
| |
| static void update_classmark(const struct gsm_classmark *src, struct gsm_classmark *dst) |
| { |
| if (src->classmark1_set) { |
| dst->classmark1 = src->classmark1; |
| dst->classmark1_set = true; |
| } |
| if (src->classmark2_len) { |
| dst->classmark2_len = src->classmark2_len; |
| memcpy(dst->classmark2, src->classmark2, sizeof(dst->classmark2)); |
| } |
| if (src->classmark3_len) { |
| dst->classmark3_len = src->classmark3_len; |
| memcpy(dst->classmark3, src->classmark3, sizeof(dst->classmark3)); |
| } |
| } |
| |
| /* VLR informs us that the subscriber has been associated with a conn */ |
| static int msc_vlr_subscr_assoc(void *msc_conn_ref, |
| struct vlr_subscr *vsub) |
| { |
| struct ran_conn *conn = msc_conn_ref; |
| OSMO_ASSERT(vsub); |
| if (conn->vsub) { |
| if (conn->vsub == vsub) |
| LOG_RAN_CONN(conn, LOGL_NOTICE, "msc_vlr_subscr_assoc(): conn already associated with %s\n", |
| vlr_subscr_name(vsub)); |
| else { |
| LOG_RAN_CONN(conn, LOGL_ERROR, "msc_vlr_subscr_assoc(): conn already associated with a subscriber," |
| " cannot associate with %s\n", vlr_subscr_name(vsub)); |
| return -EINVAL; |
| } |
| } |
| |
| conn->vsub = vlr_subscr_get(vsub); |
| OSMO_ASSERT(conn->vsub); |
| conn->vsub->cs.attached_via_ran = conn->via_ran; |
| |
| /* In case we have already received Classmark Information before the VLR Subscriber was |
| * associated with the conn: merge the new Classmark into vsub->classmark. Don't overwrite valid |
| * vsub->classmark with unset classmark, though. */ |
| update_classmark(&conn->temporary_classmark, &conn->vsub->classmark); |
| ran_conn_update_id(conn); |
| return 0; |
| } |
| |
| static int msc_vlr_route_gsup_msg(struct vlr_subscr *vsub, |
| struct osmo_gsup_message *gsup_msg) |
| { |
| switch (gsup_msg->message_type) { |
| /* GSM 09.11 code implementing SS/USSD */ |
| case OSMO_GSUP_MSGT_PROC_SS_REQUEST: |
| case OSMO_GSUP_MSGT_PROC_SS_RESULT: |
| case OSMO_GSUP_MSGT_PROC_SS_ERROR: |
| DEBUGP(DMSC, "Routed to GSM 09.11 SS/USSD handler\n"); |
| return gsm0911_gsup_handler(vsub, gsup_msg); |
| |
| /* GSM 04.11 code implementing MO SMS */ |
| case OSMO_GSUP_MSGT_MO_FORWARD_SM_ERROR: |
| case OSMO_GSUP_MSGT_MO_FORWARD_SM_RESULT: |
| case OSMO_GSUP_MSGT_READY_FOR_SM_ERROR: |
| case OSMO_GSUP_MSGT_READY_FOR_SM_RESULT: |
| DEBUGP(DMSC, "Routed to GSM 04.11 MO handler\n"); |
| return gsm411_gsup_mo_handler(vsub, gsup_msg); |
| |
| /* GSM 04.11 code implementing MT SMS */ |
| case OSMO_GSUP_MSGT_MT_FORWARD_SM_REQUEST: |
| DEBUGP(DMSC, "Routed to GSM 04.11 MT handler\n"); |
| return gsm411_gsup_mt_handler(vsub, gsup_msg); |
| |
| default: |
| LOGP(DMM, LOGL_ERROR, "No handler found for %s, dropping message...\n", |
| osmo_gsup_message_type_name(gsup_msg->message_type)); |
| return -GMM_CAUSE_MSGT_NOTEXIST_NOTIMPL; |
| } |
| } |
| |
| /* operations that we need to implement for libvlr */ |
| static const struct vlr_ops msc_vlr_ops = { |
| .tx_auth_req = msc_vlr_tx_auth_req, |
| .tx_auth_rej = msc_vlr_tx_auth_rej, |
| .tx_id_req = msc_vlr_tx_id_req, |
| .tx_lu_acc = msc_vlr_tx_lu_acc, |
| .tx_lu_rej = msc_vlr_tx_lu_rej, |
| .tx_cm_serv_acc = msc_vlr_tx_cm_serv_acc, |
| .tx_cm_serv_rej = msc_vlr_tx_cm_serv_rej, |
| .set_ciph_mode = msc_vlr_set_ciph_mode, |
| .tx_common_id = msc_vlr_tx_common_id, |
| .tx_mm_info = msc_vlr_tx_mm_info, |
| .subscr_update = msc_vlr_subscr_update, |
| .subscr_assoc = msc_vlr_subscr_assoc, |
| .forward_gsup_msg = msc_vlr_route_gsup_msg, |
| }; |
| |
| /* Allocate net->vlr so that the VTY may configure the VLR's data structures */ |
| int msc_vlr_alloc(struct gsm_network *net) |
| { |
| net->vlr = vlr_alloc(net, &msc_vlr_ops); |
| if (!net->vlr) |
| return -ENOMEM; |
| net->vlr->user_ctx = net; |
| return 0; |
| } |
| |
| /* Launch the VLR, i.e. its GSUP connection */ |
| int msc_vlr_start(struct gsm_network *net) |
| { |
| struct ipaccess_unit *ipa_dev; |
| |
| OSMO_ASSERT(net->vlr); |
| |
| ipa_dev = talloc_zero(net->vlr, struct ipaccess_unit); |
| ipa_dev->unit_name = "MSC"; |
| ipa_dev->serno = net->msc_ipa_name; /* NULL unless configured via VTY */ |
| ipa_dev->swversion = PACKAGE_NAME "-" PACKAGE_VERSION; |
| |
| return vlr_start(ipa_dev, net->vlr, net->gsup_server_addr_str, net->gsup_server_port); |
| } |
| |
| struct msgb *gsm48_create_mm_serv_rej(enum gsm48_reject_value value) |
| { |
| struct msgb *msg; |
| struct gsm48_hdr *gh; |
| |
| msg = gsm48_msgb_alloc_name("GSM 04.08 SERV REJ"); |
| if (!msg) |
| return NULL; |
| |
| gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); |
| gh->proto_discr = GSM48_PDISC_MM; |
| gh->msg_type = GSM48_MT_MM_CM_SERV_REJ; |
| gh->data[0] = value; |
| |
| return msg; |
| } |
| |
| struct msgb *gsm48_create_loc_upd_rej(uint8_t cause) |
| { |
| struct gsm48_hdr *gh; |
| struct msgb *msg; |
| |
| msg = gsm48_msgb_alloc_name("GSM 04.08 LOC UPD REJ"); |
| if (!msg) |
| return NULL; |
| |
| gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); |
| gh->proto_discr = GSM48_PDISC_MM; |
| gh->msg_type = GSM48_MT_MM_LOC_UPD_REJECT; |
| gh->data[0] = cause; |
| return msg; |
| } |
| |
| int gsm48_extract_mi(uint8_t *classmark2_lv, int length, char *mi_string, uint8_t *mi_type) |
| { |
| /* Check the size for the classmark */ |
| if (length < 1 + *classmark2_lv) |
| return -1; |
| |
| uint8_t *mi_lv = classmark2_lv + *classmark2_lv + 1; |
| if (length < 2 + *classmark2_lv + mi_lv[0]) |
| return -2; |
| |
| *mi_type = mi_lv[1] & GSM_MI_TYPE_MASK; |
| return gsm48_mi_to_string(mi_string, GSM48_MI_SIZE, mi_lv+1, *mi_lv); |
| } |
| |
| int gsm48_paging_extract_mi(struct gsm48_pag_resp *resp, int length, |
| char *mi_string, uint8_t *mi_type) |
| { |
| static const uint32_t classmark_offset = |
| offsetof(struct gsm48_pag_resp, classmark2); |
| uint8_t *classmark2_lv = (uint8_t *) &resp->classmark2; |
| return gsm48_extract_mi(classmark2_lv, length - classmark_offset, |
| mi_string, mi_type); |
| } |