/* GMM PDUs, 3GPP TS 9.4 24.008 GPRS Mobility Management Messages */ /* (C) 2023 by Sysmocom s.f.m.c. GmbH * * 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 . * */ #include #include #include #include #include #include #include #include /* MS network capability 10.5.5.12*/ struct gprs_gmm_ms_net_cap { #if OSMO_IS_LITTLE_ENDIAN uint8_t gea1:1, sm_cap_dedicated:1, sm_cap_gprs:1, ucs2_support:1, ss_screening_ind:2, solsa_cap:1, rev_level_ind:1; uint8_t pfc_feature_mode:1, gea2:1, gea3:1, gea4:1, gea5:1, gea6:1, gea7:1, lcs_va_cap:1; uint8_t ps_inter_rat_ho_geran2utran:1, ps_inter_rat_ho_geran2eutran:1, emm_combined_proc_cap:1, isr_support:1, srvcc_cap:1, epc_cap:1, nf_capability:1, geran_net_sharing_cap:1; uint8_t user_plane_integrity_protection_sup:1, gia4:1, gia5:1, gia6:1, gia7:1, epco_ie_ind:1, restrict_use_enhanced_cov_cap:1, dual_conn_eutra_nr_cap:1; #elif OSMO_IS_BIG_ENDIAN /* auto-generated from the little endian part above (libosmocore/contrib/struct_endianness.py) */ uint8_t rev_level_ind:1, solsa_cap:1, ss_screening_ind:2, ucs2_support:1, sm_cap_gprs:1, sm_cap_dedicated:1, gea1:1; uint8_t lcs_va_cap:1, gea7:1, gea6:1, gea5:1, gea4:1, gea3:1, gea2:1, pfc_feature_mode:1; uint8_t geran_net_sharing_cap:1, nf_capability:1, epc_cap:1, srvcc_cap:1, isr_support:1, emm_combined_proc_cap:1, ps_inter_rat_ho_geran2eutran:1, ps_inter_rat_ho_geran2utran:1; uint8_t dual_conn_eutra_nr_cap:1, restrict_use_enhanced_cov_cap:1, epco_ie_ind:1, gia7:1, gia6:1, gia5:1, gia4:1, user_plane_integrity_protection_sup:1; #endif } __attribute__((packed)); static const struct gprs_gmm_ms_net_cap ms_net_cap_def = { .gea1 = 1, .sm_cap_dedicated = 1, .sm_cap_gprs = 1, .ucs2_support = 0, .ss_screening_ind = 1, .solsa_cap = 0, .rev_level_ind = 1, .pfc_feature_mode = 1, .gea2 = 1, .gea3 = 1, .gea4 = 0, .gea5 = 0, .gea6 = 0, .gea7 = 0, .lcs_va_cap = 0, .ps_inter_rat_ho_geran2utran = 0, .ps_inter_rat_ho_geran2eutran = 0, .emm_combined_proc_cap = 0, .isr_support = 0, .srvcc_cap = 0, .epc_cap = 0, .nf_capability = 0, .geran_net_sharing_cap = 0, .user_plane_integrity_protection_sup = 0, .gia4 = 0, .gia5 = 0, .gia6 = 0, .gia7 = 0, .epco_ie_ind = 0, .restrict_use_enhanced_cov_cap = 0, .dual_conn_eutra_nr_cap = 0, }; /* 10.5.1.2 Ciphering Key Sequence Number */ #define CIPH_CKSN_UNAVAIL 0x03 /* 10.5.5.6 DRX parameter */ struct gprs_gmm_drx_param { #if OSMO_IS_LITTLE_ENDIAN uint8_t split_pg_cycle_code; uint8_t coeff:4, split_ccch:1, non_drx_timer:3; #elif OSMO_IS_BIG_ENDIAN /* auto-generated from the little endian part above (libosmocore/contrib/struct_endianness.py) */ uint8_t split_pg_cycle_code; uint8_t non_drx_timer:3, split_ccch:1, coeff:4; #endif } __attribute__((packed)); static const struct gprs_gmm_drx_param drx_param_def = { .split_pg_cycle_code = 10, .coeff = 0, .split_ccch = 0, .non_drx_timer = 0, }; const struct tlv_definition gprs_gmm_att_tlvdef = { .def = { [GSM48_IE_GMM_CIPH_CKSN] = { TLV_TYPE_SINGLE_TV, 1 }, [GSM48_IE_GMM_PTMSI_TYPE] = { TLV_TYPE_SINGLE_TV, 1 }, [GSM48_IE_GMM_TMSI_BASED_NRI_C] = { TLV_TYPE_TLV, 0 }, [GSM48_IE_GMM_TIMER_READY] = { TLV_TYPE_TV, 1 }, [GSM48_IE_GMM_ALLOC_PTMSI] = { TLV_TYPE_TLV, 0 }, [GSM48_IE_GMM_PTMSI_SIG] = { TLV_TYPE_FIXED, 3 }, [GSM48_IE_GMM_ADD_IDENTITY] = { TLV_TYPE_TLV, 0 }, [GSM48_IE_GMM_RAI2] = { TLV_TYPE_TLV, 0 }, [GSM48_IE_GMM_AUTH_RAND] = { TLV_TYPE_FIXED, 16 }, [GSM48_IE_GMM_AUTH_SRES] = { TLV_TYPE_FIXED, 4 }, [GSM48_IE_GMM_IMEISV] = { TLV_TYPE_TLV, 0 }, [GSM48_IE_GMM_CAUSE] = { TLV_TYPE_TV, 1 }, [GSM48_IE_GMM_RX_NPDU_NUM_LIST] = { TLV_TYPE_TLV, 0 }, [GSM48_IE_GMM_DRX_PARAM] = { TLV_TYPE_FIXED, 2 }, [GSM48_IE_GMM_AUTN] = { TLV_TYPE_TLV, 0 }, [GSM48_IE_GMM_AUTH_RES_EXT] = { TLV_TYPE_TLV, 0 }, [GSM48_IE_GMM_TIMER_T3302] = { TLV_TYPE_TLV, 0 }, [GSM48_IE_GMM_AUTH_FAIL_PAR] = { TLV_TYPE_TLV, 0 }, [GSM48_IE_GMM_MS_NET_CAPA] = { TLV_TYPE_TLV, 0 }, [GSM48_IE_GMM_PDP_CTX_STATUS] = { TLV_TYPE_TLV, 0 }, [GSM48_IE_GMM_PS_LCS_CAPA] = { TLV_TYPE_TLV, 0 }, [GSM48_IE_GMM_GMM_MBMS_CTX_ST] = { TLV_TYPE_TLV, 0 }, [GSM48_IE_GMM_TIMER_T3346] = { TLV_TYPE_TLV, 0 }, [GSM48_IE_GMM_UE_NET_CAP] = { TLV_TYPE_TLV, 0 }, [GSM48_IE_GMM_VD_PREF_UE_USAGE] = { TLV_TYPE_TLV, 0 }, [GSM48_IE_GMM_NET_FEAT_SUPPORT] = { TLV_TYPE_SINGLE_TV, 1 }, }, }; static int encode_ms_net_cap(struct gprs_gmm_entity *gmme, struct msgb *msg) { int rc; uint8_t *l; /* len */ struct bitvec bv = { .data = msg->tail, .data_len = GSM_MACBLOCK_LEN, }; msgb_put_u8(msg, GSM48_IE_GMM_MS_NET_CAPA); l = msgb_put(msg, 1); /* len */ /* TODO: we hardcode a MS Net Cap for now. We may want to pass it from the app at some point: */ rc = bitvec_unhex(&bv, "e5e0"); *l = OSMO_BYTES_FOR_BITS(bv.cur_bit); msgb_put(msg, *l); return rc; } static int encode_ms_ra_acc_cap(struct gprs_gmm_entity *gmme, struct msgb *msg) { int rc; uint8_t *l; /* len */ struct bitvec bv = { .data = msg->tail, .data_len = GSM_MACBLOCK_LEN, }; l = msgb_put(msg, 1); /* len */ /* TODO: we hardcode a MS Ra Cap for now. We may want to pass it from the app at some point: */ rc = bitvec_unhex(&bv, "171933432b37159ef98879cba28c6621e72688b198879c00"); *l = OSMO_BYTES_FOR_BITS(bv.cur_bit); msgb_put(msg, *l); return rc; } /* Chapter 9.4.1: Attach request */ int gprs_gmm_build_attach_req(struct gprs_gmm_entity *gmme, enum osmo_gprs_gmm_attach_type attach_type, bool attach_with_imsi, struct msgb *msg) { struct gsm48_hdr *gh; uint8_t byte, cksn; struct osmo_mobile_identity mi; uint8_t *l; int rc; struct gsm48_ra_id *raid_enc; unsigned long t3314_sec; gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); gh->proto_discr = GSM48_PDISC_MM_GPRS; gh->msg_type = GSM48_MT_GMM_ATTACH_REQ; /* 10.5.5.12 MS network capability */ msgb_lv_put(msg, sizeof(ms_net_cap_def), (const uint8_t *)&ms_net_cap_def); /* Attach type 10.5.5.2 */ /* Ciphering key sequence number 10.5.1.2 */ cksn = 0; /* Use 0 as Ciphering Key Sequence Number */ byte = (cksn << 4) | (attach_type & 0x0f); msgb_put_u8(msg, byte); /* DRX parameter 10.5.5.6 */ memcpy(msgb_put(msg, sizeof(drx_param_def)), &drx_param_def, sizeof(drx_param_def)); /* Mobile identity 10.5.1.4 */ /* 4.7.3.1.1: If "AttachWithIMSI" is configured, use IMSI instead: */ if (attach_with_imsi) { mi = (struct osmo_mobile_identity){ .type = GSM_MI_TYPE_IMSI, }; OSMO_STRLCPY_ARRAY(mi.imsi, gmme->imsi); } else { mi = (struct osmo_mobile_identity){ .type = GSM_MI_TYPE_TMSI, .tmsi = gmme->ptmsi, }; } l = msgb_put(msg, 1); /* len */ rc = osmo_mobile_identity_encode_msgb(msg, &mi, false); if (rc < 0) return -EINVAL; *l = rc; /* Old routing area identification 0.5.5.15 */ raid_enc = (struct gsm48_ra_id *)msgb_put(msg, sizeof(struct gsm48_ra_id)); gsm48_encode_ra(raid_enc, &gmme->ra); /* MS Radio Access capability 10.5.5.12a */ rc = encode_ms_ra_acc_cap(gmme, msg); if (rc < 0) return -EINVAL; /* TODO: optional fields */ /* 10.5.5.8 Old P-TMSI signature: */ if (!attach_with_imsi && gmme->ptmsi != GSM_RESERVED_TMSI) { uint8_t ptmsi_sig[3] = { gmme->ptmsi_sig >> 16, gmme->ptmsi_sig >> 8, gmme->ptmsi_sig }; msgb_tv_fixed_put(msg, GSM48_IE_GMM_PTMSI_SIG, sizeof(ptmsi_sig), ptmsi_sig); } /* 10.5.7.3 Requested READY timer value */ t3314_sec = osmo_tdef_get(g_gmm_ctx->T_defs, 3314, OSMO_TDEF_S, -1); msgb_tv_put(msg, GSM48_IE_GMM_TIMER_READY, gprs_gmm_secs_to_gprs_tmr_floor(t3314_sec)); /* 9.4.1.13 P-TMSI type: The MS shall include this IE if the * type of identity in the Mobile identity IE is set to * "TMSI/P-TMSI/M-TMSI". */ if (!attach_with_imsi) { uint8_t ptmsi_type_native = 1; /* Table 10.5.5.29.1 */ msgb_v_put(msg, (GSM48_IE_GMM_PTMSI_TYPE << 4) | (ptmsi_type_native & 0x01)); } return 0; } /* 9.4.3 Attach complete */ int gprs_gmm_build_attach_compl(struct gprs_gmm_entity *gmme, struct msgb *msg) { struct gsm48_hdr *gh; gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); gh->proto_discr = GSM48_PDISC_MM_GPRS; gh->msg_type = GSM48_MT_GMM_ATTACH_COMPL; /* TODO: Add optional IEs */ return 0; } /* 9.4.8 P-TMSI reallocation complete */ int gprs_gmm_build_ptmsi_realloc_compl(struct gprs_gmm_entity *gmme, struct msgb *msg) { struct gsm48_hdr *gh; gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); gh->proto_discr = GSM48_PDISC_MM_GPRS; gh->msg_type = GSM48_MT_GMM_PTMSI_REALL_COMPL; return 0; } /* 9.4.10a Authentication and Ciphering Failure */ int gprs_gmm_build_auth_ciph_fail(struct gprs_gmm_entity *gmme, struct msgb *msg, enum gsm48_gmm_cause cause) { struct gsm48_hdr *gh; gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); gh->proto_discr = GSM48_PDISC_MM_GPRS; gh->msg_type = GSM48_MT_GMM_PTMSI_REALL_COMPL; /* 10.5.5.14 Cause */ msgb_put_u8(msg, (uint8_t)cause); /* TODO: 10.5.3.2.2 Authentication Failure parameter */ return 0; } /* Chapter 9.4.14: Routing area update request */ int gprs_gmm_build_rau_req(struct gprs_gmm_entity *gmme, enum gprs_gmm_upd_type rau_type, struct msgb *msg) { struct gsm48_hdr *gh; uint8_t byte, cksn; int rc; struct gsm48_ra_id *raid_enc; unsigned long t3314_sec; uint8_t ptmsi_type_native = 1; /* Table 10.5.5.29.1 */ gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); gh->proto_discr = GSM48_PDISC_MM_GPRS; gh->msg_type = GSM48_MT_GMM_RA_UPD_REQ; /* 10.5.5.18 Update type */ cksn = gmme->auth_ciph.req.key_seq; byte = (cksn << 4) | (((uint8_t)rau_type) & 0x07); msgb_put_u8(msg, byte); /* Old routing area identification 0.5.5.15 */ raid_enc = (struct gsm48_ra_id *)msgb_put(msg, sizeof(struct gsm48_ra_id)); gsm48_encode_ra(raid_enc, &gmme->ra); /* MS Radio Access capability 10.5.5.12a */ rc = encode_ms_ra_acc_cap(gmme, msg); if (rc < 0) return -EINVAL; /* 10.5.5.8 Old P-TMSI signature: */ if (gmme->ptmsi_sig != GSM_RESERVED_TMSI) { uint8_t ptmsi_sig[3] = { gmme->ptmsi_sig >> 16, gmme->ptmsi_sig >> 8, gmme->ptmsi_sig }; msgb_tv_fixed_put(msg, GSM48_IE_GMM_PTMSI_SIG, sizeof(ptmsi_sig), ptmsi_sig); } /* 10.5.7.3 Requested READY timer value */ t3314_sec = osmo_tdef_get(g_gmm_ctx->T_defs, 3314, OSMO_TDEF_S, -1); msgb_tv_put(msg, GSM48_IE_GMM_TIMER_READY, gprs_gmm_secs_to_gprs_tmr_floor(t3314_sec)); /* DRX parameter 10.5.5.6 */ memcpy(msgb_put(msg, sizeof(drx_param_def)), &drx_param_def, sizeof(drx_param_def)); /* 9.4.14.6 MS network capability */ rc = encode_ms_net_cap(gmme, msg); if (rc < 0) return -EINVAL; /* 9.4.14.7 PDP context status */ /* TODO: implement. Table 9.4.14/3GPP TS 24.00 states it is optional (O) but 9.4.14.7 states: * "This IE shall be included by the MS." */ /* 9.4.14.17 P-TMSI type */ /* Table 9.4.14/3GPP TS 24.00 states it is optional (O) but 9.4.14.17 states: * "This IE shall be included by the MS." */ msgb_v_put(msg, (GSM48_IE_GMM_PTMSI_TYPE << 4) | (ptmsi_type_native & 0x01)); return 0; } /* 9.2.11 Identity response */ int gprs_gmm_build_identity_resp(struct gprs_gmm_entity *gmme, uint8_t mi_type, struct msgb *msg) { struct gsm48_hdr *gh; struct osmo_mobile_identity mi; uint8_t *l; int rc; gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); gh->proto_discr = GSM48_PDISC_MM_GPRS; gh->msg_type = GSM48_MT_GMM_ID_RESP; /* Mobile identity 10.5.1.4 */ switch (mi_type) { case GSM_MI_TYPE_IMSI: mi = (struct osmo_mobile_identity){ .type = GSM_MI_TYPE_IMSI, }; OSMO_STRLCPY_ARRAY(mi.imsi, gmme->imsi); break; case GSM_MI_TYPE_TMSI: mi = (struct osmo_mobile_identity){ .type = GSM_MI_TYPE_TMSI, .tmsi = gmme->ptmsi, }; break; case GSM_MI_TYPE_IMEI: mi = (struct osmo_mobile_identity){ .type = GSM_MI_TYPE_IMEI, }; OSMO_STRLCPY_ARRAY(mi.imei, gmme->imei); break; case GSM_MI_TYPE_IMEISV: mi = (struct osmo_mobile_identity){ .type = GSM_MI_TYPE_IMEISV, }; OSMO_STRLCPY_ARRAY(mi.imeisv, gmme->imeisv); break; default: LOGGMME(gmme, LOGL_ERROR, "Tx GMM IDENTITY RESPONSE: mi_type=%s not supported!\n", gsm48_mi_type_name(mi_type)); return -EINVAL; } l = msgb_put(msg, 1); /* len */ rc = osmo_mobile_identity_encode_msgb(msg, &mi, false); if (rc < 0) return -EINVAL; *l = rc; /* TODO: Optional IEs */ return 0; } /* Tx GMM Authentication and ciphering response, 9.4.10 */ int gprs_gmm_build_auth_ciph_resp(const struct gprs_gmm_entity *gmme, const uint8_t *sres, struct msgb *msg) { struct gsm48_hdr *gh; struct gsm48_auth_ciph_resp *acr; int rc = 0; gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); gh->proto_discr = GSM48_PDISC_MM_GPRS; gh->msg_type = GSM48_MT_GMM_AUTH_CIPH_RESP; acr = (struct gsm48_auth_ciph_resp *) msgb_put(msg, sizeof(*acr)); acr->ac_ref_nr = gmme->auth_ciph.req.ac_ref_nr; /* Authentication parameter Response, 10.5.3.2 */ if (sres) msgb_tv_fixed_put(msg, GSM48_IE_GMM_AUTH_SRES, 4, sres); /* IMEISV, 10.5.1.4 */ if (gmme->auth_ciph.req.imeisv_requested) { uint8_t *l; struct osmo_mobile_identity mi = (struct osmo_mobile_identity){ .type = GSM_MI_TYPE_IMEISV, }; OSMO_STRLCPY_ARRAY(mi.imeisv, gmme->imeisv); l = msgb_tl_put(msg, GSM48_IE_GMM_IMEISV); rc = osmo_mobile_identity_encode_msgb(msg, &mi, false); if (rc < 0) return -EINVAL; *l = rc; } /* TODO: Authentication Response parameter (extension) */ /* TODO: Message authentication code */ return rc; } int gprs_gmm_build_detach_req(struct gprs_gmm_entity *gmme, enum osmo_gprs_gmm_detach_ms_type detach_type, enum osmo_gprs_gmm_detach_poweroff_type poweroff_type, struct msgb *msg) { struct gsm48_hdr *gh; uint8_t byte; struct osmo_mobile_identity mi; uint8_t *l; int rc; gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); gh->proto_discr = GSM48_PDISC_MM_GPRS; gh->msg_type = GSM48_MT_GMM_DETACH_REQ; /* Detach type 10.5.5.5 + Spare half octet 10.5.1.8 */ byte = ((detach_type & 0x07) << 5) | (poweroff_type & 0x01) << 4; msgb_put_u8(msg, byte); /* DRX parameter 10.5.5.6 */ memcpy(msgb_put(msg, sizeof(drx_param_def)), &drx_param_def, sizeof(drx_param_def)); /* P-TMSI, Mobile identity 10.5.1.4 */ mi = (struct osmo_mobile_identity){ .type = GSM_MI_TYPE_TMSI, .tmsi = gmme->ptmsi, }; l = msgb_put(msg, 1); /* len */ rc = osmo_mobile_identity_encode_msgb(msg, &mi, false); if (rc < 0) return -EINVAL; *l = rc; /* TODO: optional fields: P-TMSI signature 10.5.5.8a */ return 0; } int gprs_gmm_build_rau_compl(struct gprs_gmm_entity *gmme, struct msgb *msg) { struct gsm48_hdr *gh; gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); gh->proto_discr = GSM48_PDISC_MM_GPRS; gh->msg_type = GSM48_MT_GMM_RA_UPD_COMPL; /* TODO: 3GPP TS 24.008 4.7.5.1.3 "If Receive N-PDU Numbers were * included, the Receive N-PDU Numbers values valid in the MS, shall be included in * the ROUTING AREA UPDATE COMPLETE message." */ /* TODO: Add optional IEs */ return 0; }