/* 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) 2009-2015 by Harald Welte * (C) 2010 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 . * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define PTMSI_ALLOC extern struct sgsn_instance *sgsn; static const struct tlv_definition gsm48_gmm_att_tlvdef = { .def = { [GSM48_IE_GMM_CIPH_CKSN] = { TLV_TYPE_FIXED, 1 }, [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_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_DRX_PARAM] = { TLV_TYPE_FIXED, 2 }, [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 }, }, }; static const struct tlv_definition gsm48_sm_att_tlvdef = { .def = { [GSM48_IE_GSM_APN] = { TLV_TYPE_TLV, 0 }, [GSM48_IE_GSM_PROTO_CONF_OPT] = { TLV_TYPE_TLV, 0 }, [GSM48_IE_GSM_PDP_ADDR] = { TLV_TYPE_TLV, 0 }, [GSM48_IE_GSM_AA_TMR] = { TLV_TYPE_TV, 1 }, [GSM48_IE_GSM_NAME_FULL] = { TLV_TYPE_TLV, 0 }, [GSM48_IE_GSM_NAME_SHORT] = { TLV_TYPE_TLV, 0 }, [GSM48_IE_GSM_TIMEZONE] = { TLV_TYPE_FIXED, 1 }, [GSM48_IE_GSM_UTC_AND_TZ] = { TLV_TYPE_FIXED, 7 }, [GSM48_IE_GSM_LSA_ID] = { TLV_TYPE_TLV, 0 }, }, }; static int gsm48_gmm_authorize(struct sgsn_mm_ctx *ctx); int sgsn_ranap_rab_ass_resp(struct sgsn_mm_ctx *ctx, RANAP_RAB_SetupOrModifiedItemIEs_t *setup_ies); int sgsn_ranap_iu_event(struct ue_conn_ctx *ctx, enum iu_event_type type, void *data) { struct sgsn_mm_ctx *mm; int rc = -1; mm = sgsn_mm_ctx_by_ue_ctx(ctx); if (!mm) { LOGP(DRANAP, LOGL_NOTICE, "Cannot find mm ctx for IU event %i!\n", type); return rc; } switch (type) { case IU_EVENT_RAB_ASSIGN: rc = sgsn_ranap_rab_ass_resp(mm, (RANAP_RAB_SetupOrModifiedItemIEs_t *)data); break; case IU_EVENT_IU_RELEASE: /* fall thru */ case IU_EVENT_LINK_INVALIDATED: /* Clean up ue_conn_ctx here */ LOGMMCTXP(LOGL_INFO, mm, "IU release\n"); rc = 0; break; case IU_EVENT_SECURITY_MODE_COMPLETE: /* Continue authentication here */ mm->iu.ue_ctx->integrity_active = 1; rc = gsm48_gmm_authorize(mm); break; default: LOGP(DRANAP, LOGL_NOTICE, "Unknown event received: %i\n", type); rc = -1; break; } return rc; } /* Our implementation, should be kept in SGSN */ static void mmctx_timer_cb(void *_mm); static void mmctx_timer_start(struct sgsn_mm_ctx *mm, unsigned int T, unsigned int seconds) { if (osmo_timer_pending(&mm->timer)) LOGMMCTXP(LOGL_ERROR, mm, "Starting MM timer %u while old " "timer %u pending\n", T, mm->T); mm->T = T; mm->num_T_exp = 0; /* FIXME: we should do this only once ? */ mm->timer.data = mm; mm->timer.cb = &mmctx_timer_cb; osmo_timer_schedule(&mm->timer, seconds, 0); } static void mmctx_timer_stop(struct sgsn_mm_ctx *mm, unsigned int T) { if (mm->T != T) LOGMMCTXP(LOGL_ERROR, mm, "Stopping MM timer %u but " "%u is running\n", T, mm->T); osmo_timer_del(&mm->timer); } time_t gprs_max_time_to_idle(void) { return sgsn->cfg.timers.T3314 + (sgsn->cfg.timers.T3312 + 4 * 60); } /* Send a message through the underlying layer */ static int gsm48_gmm_sendmsg(struct msgb *msg, int command, struct sgsn_mm_ctx *mm) { if (mm) rate_ctr_inc(&mm->ctrg->ctr[GMM_CTR_PKTS_SIG_OUT]); if (msg->dst) return iu_tx(msg, GPRS_SAPI_GMM); /* caller needs to provide TLLI, BVCI and NSEI */ return gprs_llc_tx_ui(msg, GPRS_SAPI_GMM, command, mm); } /* copy identifiers from old message to new message, this * is required so lower layers can route it correctly */ static void gmm_copy_id(struct msgb *msg, const struct msgb *old) { msgb_tlli(msg) = msgb_tlli(old); msgb_bvci(msg) = msgb_bvci(old); msgb_nsei(msg) = msgb_nsei(old); msg->dst = old->dst; } /* Store BVCI/NSEI in MM context */ static void msgid2mmctx(struct sgsn_mm_ctx *mm, const struct msgb *msg) { mm->gb.bvci = msgb_bvci(msg); mm->gb.nsei = msgb_nsei(msg); mm->iu.ue_ctx = msg->dst; } /* Store BVCI/NSEI in MM context */ static void mmctx2msgid(struct msgb *msg, const struct sgsn_mm_ctx *mm) { msgb_tlli(msg) = mm->gb.tlli; msgb_bvci(msg) = mm->gb.bvci; msgb_nsei(msg) = mm->gb.nsei; msg->dst = mm->iu.ue_ctx; } static void mm_ctx_cleanup_free(struct sgsn_mm_ctx *ctx, const char *log_text) { LOGMMCTXP(LOGL_INFO, ctx, "Cleaning MM context due to %s\n", log_text); /* Mark MM state as deregistered */ ctx->mm_state = GMM_DEREGISTERED; sgsn_mm_ctx_cleanup_free(ctx); } /* Chapter 9.4.18 */ static int _tx_status(struct msgb *msg, uint8_t cause, struct sgsn_mm_ctx *mmctx, int sm) { struct gsm48_hdr *gh; /* MMCTX might be NULL! */ DEBUGP(DMM, "<- GPRS MM STATUS (cause: %s)\n", get_value_string(gsm48_gmm_cause_names, cause)); gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); if (sm) { gh->proto_discr = GSM48_PDISC_SM_GPRS; gh->msg_type = GSM48_MT_GSM_STATUS; } else { gh->proto_discr = GSM48_PDISC_MM_GPRS; gh->msg_type = GSM48_MT_GMM_STATUS; } gh->data[0] = cause; return gsm48_gmm_sendmsg(msg, 0, mmctx); } static int gsm48_tx_gmm_status(struct sgsn_mm_ctx *mmctx, uint8_t cause) { struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 GMM STATUS"); mmctx2msgid(msg, mmctx); return _tx_status(msg, cause, mmctx, 0); } static int gsm48_tx_sm_status(struct sgsn_mm_ctx *mmctx, uint8_t cause) { struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 SM STATUS"); mmctx2msgid(msg, mmctx); return _tx_status(msg, cause, mmctx, 1); } static int _tx_detach_req(struct msgb *msg, uint8_t detach_type, uint8_t cause, struct sgsn_mm_ctx *mmctx) { struct gsm48_hdr *gh; /* MMCTX might be NULL! */ DEBUGP(DMM, "<- GPRS MM DETACH REQ (type: %s, cause: %s)\n", get_value_string(gprs_det_t_mt_strs, detach_type), get_value_string(gsm48_gmm_cause_names, cause)); gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); gh->proto_discr = GSM48_PDISC_MM_GPRS; gh->msg_type = GSM48_MT_GMM_DETACH_REQ; gh->data[0] = detach_type & 0x07; msgb_tv_put(msg, GSM48_IE_GMM_CAUSE, cause); return gsm48_gmm_sendmsg(msg, 0, mmctx); } static int gsm48_tx_gmm_detach_req(struct sgsn_mm_ctx *mmctx, uint8_t detach_type, uint8_t cause) { struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 DET REQ"); mmctx2msgid(msg, mmctx); return _tx_detach_req(msg, detach_type, cause, mmctx); } static int gsm48_tx_gmm_detach_req_oldmsg(struct msgb *oldmsg, uint8_t detach_type, uint8_t cause) { struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 DET OLD"); gmm_copy_id(msg, oldmsg); return _tx_detach_req(msg, detach_type, cause, NULL); } static struct gsm48_qos default_qos = { .delay_class = 4, /* best effort */ .reliab_class = GSM48_QOS_RC_LLC_UN_RLC_ACK_DATA_PROT, .peak_tput = GSM48_QOS_PEAK_TPUT_32000bps, .preced_class = GSM48_QOS_PC_NORMAL, .mean_tput = GSM48_QOS_MEAN_TPUT_BEST_EFFORT, .traf_class = GSM48_QOS_TC_INTERACTIVE, .deliv_order = GSM48_QOS_DO_UNORDERED, .deliv_err_sdu = GSM48_QOS_ERRSDU_YES, .max_sdu_size = GSM48_QOS_MAXSDU_1520, .max_bitrate_up = GSM48_QOS_MBRATE_63k, .max_bitrate_down = GSM48_QOS_MBRATE_63k, .resid_ber = GSM48_QOS_RBER_5e_2, .sdu_err_ratio = GSM48_QOS_SERR_1e_2, .handling_prio = 3, .xfer_delay = 0x10, /* 200ms */ .guar_bitrate_up = GSM48_QOS_MBRATE_0k, .guar_bitrate_down = GSM48_QOS_MBRATE_0k, .sig_ind = 0, /* not optimised for signalling */ .max_bitrate_down_ext = 0, /* use octet 9 */ .guar_bitrate_down_ext = 0, /* use octet 13 */ }; /* Chapter 9.4.2: Attach accept */ static int gsm48_tx_gmm_att_ack(struct sgsn_mm_ctx *mm) { struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 ATT ACK"); struct gsm48_hdr *gh; struct gsm48_attach_ack *aa; uint8_t *mid; #if 0 uint8_t *ptsig; #endif LOGMMCTXP(LOGL_INFO, mm, "<- GPRS ATTACH ACCEPT (new P-TMSI=0x%08x)\n", mm->p_tmsi); mmctx2msgid(msg, mm); gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); gh->proto_discr = GSM48_PDISC_MM_GPRS; gh->msg_type = GSM48_MT_GMM_ATTACH_ACK; aa = (struct gsm48_attach_ack *) msgb_put(msg, sizeof(*aa)); aa->force_stby = 0; /* not indicated */ aa->att_result = 1; /* GPRS only */ aa->ra_upd_timer = gprs_secs_to_tmr_floor(sgsn->cfg.timers.T3312); aa->radio_prio = 4; /* lowest */ gsm48_construct_ra(aa->ra_id.digits, &mm->ra); #if 0 /* Optional: P-TMSI signature */ msgb_v_put(msg, GSM48_IE_GMM_PTMSI_SIG); ptsig = msgb_put(msg, 3); ptsig[0] = mm->p_tmsi_sig >> 16; ptsig[1] = mm->p_tmsi_sig >> 8; ptsig[2] = mm->p_tmsi_sig & 0xff; #endif /* Optional: Negotiated Ready timer value * (fixed 44s, default value, GSM 04.08, table 11.4a) to safely limit * the inactivity time READY->STANDBY. */ msgb_tv_put(msg, GSM48_IE_GMM_TIMER_READY, gprs_secs_to_tmr_floor(sgsn->cfg.timers.T3314)); #ifdef PTMSI_ALLOC /* Optional: Allocated P-TMSI */ mid = msgb_put(msg, GSM48_MID_TMSI_LEN); gsm48_generate_mid_from_tmsi(mid, mm->p_tmsi); mid[0] = GSM48_IE_GMM_ALLOC_PTMSI; #endif /* Optional: MS-identity (combined attach) */ /* Optional: GMM cause (partial attach result for combined attach) */ return gsm48_gmm_sendmsg(msg, 0, mm); } /* Chapter 9.4.5: Attach reject */ static int _tx_gmm_att_rej(struct msgb *msg, uint8_t gmm_cause, const struct sgsn_mm_ctx *mm) { struct gsm48_hdr *gh; LOGMMCTXP(LOGL_NOTICE, mm, "<- GPRS ATTACH REJECT: %s\n", get_value_string(gsm48_gmm_cause_names, gmm_cause)); gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); gh->proto_discr = GSM48_PDISC_MM_GPRS; gh->msg_type = GSM48_MT_GMM_ATTACH_REJ; gh->data[0] = gmm_cause; return gsm48_gmm_sendmsg(msg, 0, NULL); } static int gsm48_tx_gmm_att_rej_oldmsg(const struct msgb *old_msg, uint8_t gmm_cause) { struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 ATT REJ OLD"); gmm_copy_id(msg, old_msg); return _tx_gmm_att_rej(msg, gmm_cause, NULL); } static int gsm48_tx_gmm_att_rej(struct sgsn_mm_ctx *mm, uint8_t gmm_cause) { struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 ATT REJ"); mmctx2msgid(msg, mm); return _tx_gmm_att_rej(msg, gmm_cause, mm); } /* Chapter 9.4.6.2 Detach accept */ static int _tx_detach_ack(struct msgb *msg, uint8_t force_stby, struct sgsn_mm_ctx *mm) { struct gsm48_hdr *gh; /* MMCTX might be NULL! */ DEBUGP(DMM, "<- GPRS MM DETACH ACC (force-standby: %d)\n", force_stby); gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); gh->proto_discr = GSM48_PDISC_MM_GPRS; gh->msg_type = GSM48_MT_GMM_DETACH_ACK; gh->data[0] = force_stby; return gsm48_gmm_sendmsg(msg, 0, mm); } static int gsm48_tx_gmm_det_ack(struct sgsn_mm_ctx *mm, uint8_t force_stby) { struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 DET ACK"); mmctx2msgid(msg, mm); return _tx_detach_ack(msg, force_stby, mm); } static int gsm48_tx_gmm_det_ack_oldmsg(struct msgb *oldmsg, uint8_t force_stby) { struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 DET ACK OLD"); gmm_copy_id(msg, oldmsg); return _tx_detach_ack(msg, force_stby, NULL); } /* Transmit Chapter 9.4.12 Identity Request */ static int gsm48_tx_gmm_id_req(struct sgsn_mm_ctx *mm, uint8_t id_type) { struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 ID REQ"); struct gsm48_hdr *gh; LOGMMCTXP(LOGL_DEBUG, mm, "<- GPRS IDENTITY REQUEST: mi_type=%s\n", gsm48_mi_type_name(id_type)); mmctx2msgid(msg, mm); gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); gh->proto_discr = GSM48_PDISC_MM_GPRS; gh->msg_type = GSM48_MT_GMM_ID_REQ; /* 10.5.5.9 ID type 2 + identity type and 10.5.5.7 'force to standby' IE */ gh->data[0] = id_type & 0xf; return gsm48_gmm_sendmsg(msg, 1, mm); } /* Section 9.4.9: Authentication and Ciphering Request */ static int gsm48_tx_gmm_auth_ciph_req(struct sgsn_mm_ctx *mm, uint8_t *rand, uint8_t key_seq, uint8_t algo) { struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 AUTH CIPH REQ"); struct gsm48_hdr *gh; struct gsm48_auth_ciph_req *acreq; uint8_t *m_rand, *m_cksn; LOGMMCTXP(LOGL_INFO, mm, "<- GPRS AUTH AND CIPHERING REQ (rand = %s)\n", osmo_hexdump(rand, 16)); mmctx2msgid(msg, mm); gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); gh->proto_discr = GSM48_PDISC_MM_GPRS; gh->msg_type = GSM48_MT_GMM_AUTH_CIPH_REQ; acreq = (struct gsm48_auth_ciph_req *) msgb_put(msg, sizeof(*acreq)); acreq->ciph_alg = algo & 0xf; acreq->imeisv_req = 0x1; acreq->force_stby = 0x0; acreq->ac_ref_nr = 0x0; /* FIXME: increment this? */ /* Only if authentication is requested we need to set RAND + CKSN */ if (rand) { m_rand = msgb_put(msg, 16+1); m_rand[0] = GSM48_IE_GMM_AUTH_RAND; memcpy(m_rand+1, rand, 16); m_cksn = msgb_put(msg, 1); m_cksn[0] = (GSM48_IE_GMM_CIPH_CKSN << 4) | (key_seq & 0x07); } /* FIXME: make sure we don't send any other messages to the MS */ return gsm48_gmm_sendmsg(msg, 1, mm); } /* Section 9.4.11: Authentication and Ciphering Reject */ static int gsm48_tx_gmm_auth_ciph_rej(struct sgsn_mm_ctx *mm) { struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 AUTH CIPH REJ"); struct gsm48_hdr *gh; LOGMMCTXP(LOGL_NOTICE, mm, "<- GPRS AUTH AND CIPH REJECT\n"); mmctx2msgid(msg, mm); gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); gh->proto_discr = GSM48_PDISC_MM_GPRS; gh->msg_type = GSM48_MT_GMM_AUTH_CIPH_REJ; return gsm48_gmm_sendmsg(msg, 0, mm); } /* Section 9.4.10: Authentication and Ciphering Response */ static int gsm48_rx_gmm_auth_ciph_resp(struct sgsn_mm_ctx *ctx, struct msgb *msg) { struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); struct gsm48_auth_ciph_resp *acr = (struct gsm48_auth_ciph_resp *)gh->data; struct tlv_parsed tp; struct gsm_auth_tuple *at; int rc; LOGMMCTXP(LOGL_INFO, ctx, "-> GPRS AUTH AND CIPH RESPONSE\n"); if (ctx->auth_triplet.key_seq == GSM_KEY_SEQ_INVAL) { LOGMMCTXP(LOGL_NOTICE, ctx, "Unexpected Auth & Ciph Response (ignored)\n"); return 0; } /* Stop T3360 */ mmctx_timer_stop(ctx, 3360); tlv_parse(&tp, &gsm48_gmm_att_tlvdef, acr->data, (msg->data + msg->len) - acr->data, 0, 0); /* FIXME: compare ac_ref? */ if (!TLVP_PRESENT(&tp, GSM48_IE_GMM_AUTH_SRES) || !TLVP_PRESENT(&tp, GSM48_IE_GMM_IMEISV)) { /* TODO: missing mandatory IE, return STATUS or REJ? */ LOGMMCTXP(LOGL_ERROR, ctx, "Missing mandantory IE\n"); return -EINVAL; } /* Compare SRES with what we expected */ LOGMMCTXP(LOGL_DEBUG, ctx, "checking received auth info, SRES = %s\n", osmo_hexdump(TLVP_VAL(&tp, GSM48_IE_GMM_AUTH_SRES), TLVP_LEN(&tp, GSM48_IE_GMM_AUTH_SRES))); at = &ctx->auth_triplet; if (TLVP_LEN(&tp, GSM48_IE_GMM_AUTH_SRES) != sizeof(at->sres) || memcmp(TLVP_VAL(&tp, GSM48_IE_GMM_AUTH_SRES), at->sres, sizeof(at->sres)) != 0) { LOGMMCTXP(LOGL_NOTICE, ctx, "Received SRES doesn't match\n"); rc = gsm48_tx_gmm_auth_ciph_rej(ctx); mm_ctx_cleanup_free(ctx, "GPRS AUTH AND CIPH REJECT"); return rc; } ctx->is_authenticated = 1; if (ctx->ran_type == MM_CTX_T_UTRAN_Iu) ctx->iu.new_key = 1; /* FIXME: enable LLC cipheirng */ /* Check if we can let the mobile station enter */ rc = gsm48_gmm_authorize(ctx); return rc; } static void extract_subscr_msisdn(struct sgsn_mm_ctx *ctx) { struct gsm_mncc_number called; uint8_t msisdn[sizeof(ctx->subscr->sgsn_data->msisdn) + 1]; /* Convert MSISDN from encoded to string.. */ if (!ctx->subscr) return; if (ctx->subscr->sgsn_data->msisdn_len < 1) return; /* prepare the data for the decoder */ memset(&called, 0, sizeof(called)); msisdn[0] = ctx->subscr->sgsn_data->msisdn_len; memcpy(&msisdn[1], ctx->subscr->sgsn_data->msisdn, ctx->subscr->sgsn_data->msisdn_len); /* decode the string now */ gsm48_decode_called(&called, msisdn); /* Prepend a '+' for international numbers */ if (called.plan == 1 && called.type == 1) { ctx->msisdn[0] = '+'; strncpy(&ctx->msisdn[1], called.number, sizeof(ctx->msisdn) - 1); } else { strncpy(&ctx->msisdn[0], called.number, sizeof(ctx->msisdn) - 1); } } static void extract_subscr_hlr(struct sgsn_mm_ctx *ctx) { struct gsm_mncc_number called; uint8_t hlr_number[sizeof(ctx->subscr->sgsn_data->hlr) + 1]; if (!ctx->subscr) return; if (ctx->subscr->sgsn_data->hlr_len < 1) return; /* prepare the data for the decoder */ memset(&called, 0, sizeof(called)); hlr_number[0] = ctx->subscr->sgsn_data->hlr_len; memcpy(&hlr_number[1], ctx->subscr->sgsn_data->hlr, ctx->subscr->sgsn_data->hlr_len); /* decode the string now */ gsm48_decode_called(&called, hlr_number); if (called.plan != 1) { LOGMMCTXP(LOGL_ERROR, ctx, "Numbering plan(%d) not allowed\n", called.plan); return; } if (called.type != 1) { LOGMMCTXP(LOGL_ERROR, ctx, "Numbering type(%d) not allowed\n", called.type); return; } strncpy(&ctx->hlr[0], called.number, sizeof(ctx->hlr) - 1); } /* Chapter 9.4.21: Service accept */ static int gsm48_tx_gmm_service_ack(struct sgsn_mm_ctx *mm) { struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 SERVICE ACK"); struct gsm48_hdr *gh; LOGMMCTXP(LOGL_INFO, mm, "<- GPRS SERVICE ACCEPT (P-TMSI=0x%08x)\n", mm->p_tmsi); mmctx2msgid(msg, mm); gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); gh->proto_discr = GSM48_PDISC_MM_GPRS; gh->msg_type = GSM48_MT_GMM_SERVICE_ACK; /* Optional: PDP context status */ /* Optional: MBMS context status */ return gsm48_gmm_sendmsg(msg, 0, mm); } /* Chapter 9.4.22: Service reject */ static int _tx_gmm_service_rej(struct msgb *msg, uint8_t gmm_cause, const struct sgsn_mm_ctx *mm) { struct gsm48_hdr *gh; LOGMMCTXP(LOGL_NOTICE, mm, "<- GPRS SERVICE REJECT: %s\n", get_value_string(gsm48_gmm_cause_names, gmm_cause)); gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); gh->proto_discr = GSM48_PDISC_MM_GPRS; gh->msg_type = GSM48_MT_GMM_SERVICE_REJ; gh->data[0] = gmm_cause; return gsm48_gmm_sendmsg(msg, 0, NULL); } static int gsm48_tx_gmm_service_rej_oldmsg(const struct msgb *old_msg, uint8_t gmm_cause) { struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 SERVICE REJ OLD"); gmm_copy_id(msg, old_msg); return _tx_gmm_service_rej(msg, gmm_cause, NULL); } static int gsm48_tx_gmm_service_rej(struct sgsn_mm_ctx *mm, uint8_t gmm_cause) { struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 SERVICE REJ"); mmctx2msgid(msg, mm); return _tx_gmm_service_rej(msg, gmm_cause, mm); } static int gsm48_tx_gmm_ra_upd_ack(struct sgsn_mm_ctx *mm); void activate_pdp_rabs(struct sgsn_mm_ctx *ctx) { /* Send RAB activation requests for all PDP contexts */ struct sgsn_pdp_ctx *pdp; uint8_t rab_id; llist_for_each_entry(pdp, &ctx->pdp_list, list) { rab_id = rab_id_from_mm_ctx(ctx); iu_rab_act_ps(rab_id, pdp, 1); } } /* Check if we can already authorize a subscriber */ static int gsm48_gmm_authorize(struct sgsn_mm_ctx *ctx) { int rc; #ifndef PTMSI_ALLOC struct sgsn_signal_data sig_data; #endif /* Request IMSI and IMEI from the MS if they are unknown */ if (!strlen(ctx->imei)) { ctx->t3370_id_type = GSM_MI_TYPE_IMEI; mmctx_timer_start(ctx, 3370, sgsn->cfg.timers.T3370); return gsm48_tx_gmm_id_req(ctx, GSM_MI_TYPE_IMEI); } if (!strlen(ctx->imsi)) { ctx->t3370_id_type = GSM_MI_TYPE_IMSI; mmctx_timer_start(ctx, 3370, sgsn->cfg.timers.T3370); return gsm48_tx_gmm_id_req(ctx, GSM_MI_TYPE_IMSI); } /* All information required for authentication is available */ ctx->t3370_id_type = GSM_MI_TYPE_NONE; if (ctx->auth_state == SGSN_AUTH_UNKNOWN) { /* Request authorization, this leads to a call to * sgsn_auth_update which in turn calls * gsm0408_gprs_access_granted or gsm0408_gprs_access_denied */ sgsn_auth_request(ctx); /* Note that gsm48_gmm_authorize can be called recursively via * sgsn_auth_request iff ctx->auth_info changes to AUTH_ACCEPTED */ return 0; } if (ctx->auth_state == SGSN_AUTH_AUTHENTICATE && !ctx->is_authenticated) { struct gsm_auth_tuple *at = &ctx->auth_triplet; mmctx_timer_start(ctx, 3360, sgsn->cfg.timers.T3360); return gsm48_tx_gmm_auth_ciph_req(ctx, at->rand, at->key_seq, GPRS_ALGO_GEA0); } if (ctx->auth_state == SGSN_AUTH_AUTHENTICATE && ctx->is_authenticated && ctx->auth_triplet.key_seq != GSM_KEY_SEQ_INVAL) { /* Check again for authorization */ sgsn_auth_request(ctx); return 0; } if (ctx->auth_state != SGSN_AUTH_ACCEPTED) { LOGMMCTXP(LOGL_NOTICE, ctx, "authorization is denied, aborting procedure\n"); return -EACCES; } /* The MS is authorized */ if (ctx->ran_type == MM_CTX_T_UTRAN_Iu && !ctx->iu.ue_ctx->integrity_active) { rc = iu_tx_sec_mode_cmd(ctx->iu.ue_ctx, &ctx->auth_triplet, 0, ctx->iu.new_key); ctx->iu.new_key = 0; return rc; } switch (ctx->pending_req) { case 0: LOGMMCTXP(LOGL_INFO, ctx, "no pending request, authorization completed\n"); break; case GSM48_MT_GMM_ATTACH_REQ: ctx->pending_req = 0; extract_subscr_msisdn(ctx); extract_subscr_hlr(ctx); #ifdef PTMSI_ALLOC /* Start T3350 and re-transmit up to 5 times until ATTACH COMPLETE */ mmctx_timer_start(ctx, 3350, sgsn->cfg.timers.T3350); ctx->t3350_mode = GMM_T3350_MODE_ATT; #else memset(&sig_data, 0, sizeof(sig_data)); sig_data.mm = mmctx; osmo_signal_dispatch(SS_SGSN, S_SGSN_ATTACH, &sig_data); ctx->mm_state = GMM_REGISTERED_NORMAL; #endif return gsm48_tx_gmm_att_ack(ctx); case GSM48_MT_GMM_SERVICE_REQ: /* TODO: PMM State transition */ ctx->pending_req = 0; rc = gsm48_tx_gmm_service_ack(ctx); if (ctx->iu.service.type == 1) { activate_pdp_rabs(ctx); } return rc; case GSM48_MT_GMM_RA_UPD_REQ: ctx->pending_req = 0; /* Send RA UPDATE ACCEPT */ return gsm48_tx_gmm_ra_upd_ack(ctx); default: LOGMMCTXP(LOGL_ERROR, ctx, "only Attach Request is supported yet, " "got request type %u\n", ctx->pending_req); break; } return 0; } void gsm0408_gprs_authenticate(struct sgsn_mm_ctx *ctx) { ctx->is_authenticated = 0; gsm48_gmm_authorize(ctx); } void gsm0408_gprs_access_granted(struct sgsn_mm_ctx *ctx) { switch (ctx->mm_state) { case GMM_COMMON_PROC_INIT: LOGMMCTXP(LOGL_NOTICE, ctx, "Authorized, continuing procedure, IMSI=%s\n", ctx->imsi); /* Continue with the authorization */ gsm48_gmm_authorize(ctx); break; default: LOGMMCTXP(LOGL_INFO, ctx, "Authorized, ignored, IMSI=%s\n", ctx->imsi); } } void gsm0408_gprs_access_denied(struct sgsn_mm_ctx *ctx, int gmm_cause) { if (gmm_cause == SGSN_ERROR_CAUSE_NONE) gmm_cause = GMM_CAUSE_GPRS_NOTALLOWED; switch (ctx->mm_state) { case GMM_COMMON_PROC_INIT: LOGMMCTXP(LOGL_NOTICE, ctx, "Not authorized, rejecting ATTACH REQUEST " "with cause '%s' (%d)\n", get_value_string(gsm48_gmm_cause_names, gmm_cause), gmm_cause); gsm48_tx_gmm_att_rej(ctx, gmm_cause); mm_ctx_cleanup_free(ctx, "GPRS ATTACH REJECT"); break; case GMM_REGISTERED_NORMAL: case GMM_REGISTERED_SUSPENDED: LOGMMCTXP(LOGL_NOTICE, ctx, "Authorization lost, detaching " "with cause '%s' (%d)\n", get_value_string(gsm48_gmm_cause_names, gmm_cause), gmm_cause); gsm48_tx_gmm_detach_req( ctx, GPRS_DET_T_MT_REATT_NOTREQ, gmm_cause); mm_ctx_cleanup_free(ctx, "auth lost"); break; default: LOGMMCTXP(LOGL_INFO, ctx, "Authorization lost, cause is '%s' (%d)\n", get_value_string(gsm48_gmm_cause_names, gmm_cause), gmm_cause); mm_ctx_cleanup_free(ctx, "auth lost"); } } void gsm0408_gprs_access_cancelled(struct sgsn_mm_ctx *ctx, int gmm_cause) { if (gmm_cause != SGSN_ERROR_CAUSE_NONE) { LOGMMCTXP(LOGL_INFO, ctx, "Cancelled with cause '%s' (%d), deleting context\n", get_value_string(gsm48_gmm_cause_names, gmm_cause), gmm_cause); gsm0408_gprs_access_denied(ctx, gmm_cause); return; } LOGMMCTXP(LOGL_INFO, ctx, "Cancelled, deleting context silently\n"); mm_ctx_cleanup_free(ctx, "access cancelled"); } /* Parse Chapter 9.4.13 Identity Response */ static int gsm48_rx_gmm_id_resp(struct sgsn_mm_ctx *ctx, struct msgb *msg) { struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); uint8_t mi_type = gh->data[1] & GSM_MI_TYPE_MASK; char mi_string[GSM48_MI_SIZE]; gsm48_mi_to_string(mi_string, sizeof(mi_string), &gh->data[1], gh->data[0]); if (!ctx) { DEBUGP(DMM, "from unknown TLLI 0x%08x?!? This should not happen\n", msgb_tlli(msg)); return -EINVAL; } LOGMMCTXP(LOGL_DEBUG, ctx, "-> GMM IDENTITY RESPONSE: MI(%s)=%s\n", gsm48_mi_type_name(mi_type), mi_string); if (ctx->t3370_id_type == GSM_MI_TYPE_NONE) { LOGMMCTXP(LOGL_NOTICE, ctx, "Got unexpected IDENTITY RESPONSE: MI(%s)=%s, " "ignoring message\n", gsm48_mi_type_name(mi_type), mi_string); return -EINVAL; } if (mi_type == ctx->t3370_id_type) mmctx_timer_stop(ctx, 3370); switch (mi_type) { case GSM_MI_TYPE_IMSI: /* we already have a mm context with current TLLI, but no * P-TMSI / IMSI yet. What we now need to do is to fill * this initial context with data from the HLR */ if (strlen(ctx->imsi) == 0) { /* Check if we already have a MM context for this IMSI */ struct sgsn_mm_ctx *ictx; ictx = sgsn_mm_ctx_by_imsi(mi_string); if (ictx) { /* Handle it like in gsm48_rx_gmm_det_req, * except that no messages are sent to the BSS */ LOGMMCTXP(LOGL_NOTICE, ctx, "Deleting old MM Context for same IMSI " "p_tmsi_old=0x%08x\n", ictx->p_tmsi); mm_ctx_cleanup_free(ictx, "GPRS IMSI re-use"); } } strncpy(ctx->imsi, mi_string, sizeof(ctx->imsi) - 1); break; case GSM_MI_TYPE_IMEI: strncpy(ctx->imei, mi_string, sizeof(ctx->imei) - 1); break; case GSM_MI_TYPE_IMEISV: break; } /* Check if we can let the mobile station enter */ return gsm48_gmm_authorize(ctx); } /* Section 9.4.1 Attach request */ static int gsm48_rx_gmm_att_req(struct sgsn_mm_ctx *ctx, struct msgb *msg, struct gprs_llc_llme *llme) { struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); uint8_t *cur = gh->data, *msnc, *mi, *ms_ra_acc_cap; uint8_t msnc_len, att_type, mi_len, mi_type, ms_ra_acc_cap_len; uint16_t drx_par; uint32_t tmsi; char mi_string[GSM48_MI_SIZE]; struct gprs_ra_id ra_id; uint16_t cid = 0; enum gsm48_gmm_cause reject_cause; int rc; LOGMMCTXP(LOGL_INFO, ctx, "-> GMM ATTACH REQUEST "); /* As per TS 04.08 Chapter 4.7.1.4, the attach request arrives either * with a foreign TLLI (P-TMSI that was allocated to the MS before), * or with random TLLI. */ if (!msg->dst) cid = bssgp_parse_cell_id(&ra_id, msgb_bcid(msg)); /* MS network capability 10.5.5.12 */ msnc_len = *cur++; msnc = cur; if (msnc_len > sizeof(ctx->ms_network_capa.buf)) goto err_inval; cur += msnc_len; /* TODO: In iu mode - handle follow-on request */ /* aTTACH Type 10.5.5.2 */ att_type = *cur++ & 0x07; /* DRX parameter 10.5.5.6 */ drx_par = *cur++ << 8; drx_par |= *cur++; /* Mobile Identity (P-TMSI or IMSI) 10.5.1.4 */ mi_len = *cur++; mi = cur; if (mi_len > 8) goto err_inval; mi_type = *mi & GSM_MI_TYPE_MASK; cur += mi_len; gsm48_mi_to_string(mi_string, sizeof(mi_string), mi, mi_len); DEBUGPC(DMM, "MI(%s) type=\"%s\" ", mi_string, get_value_string(gprs_att_t_strs, att_type)); /* Old routing area identification 10.5.5.15. Skip it */ cur += 6; /* MS Radio Access Capability 10.5.5.12a */ ms_ra_acc_cap_len = *cur++; ms_ra_acc_cap = cur; if (ms_ra_acc_cap_len > sizeof(ctx->ms_radio_access_capa.buf)) goto err_inval; cur += ms_ra_acc_cap_len; LOGPC(DMM, LOGL_INFO, "\n"); /* Optional: Old P-TMSI Signature, Requested READY timer, TMSI Status */ switch (mi_type) { case GSM_MI_TYPE_IMSI: /* Try to find MM context based on IMSI */ if (!ctx) ctx = sgsn_mm_ctx_by_imsi(mi_string); if (!ctx) { #if 0 return gsm48_tx_gmm_att_rej(msg, GMM_CAUSE_IMSI_UNKNOWN); #else if (msg->dst) ctx = sgsn_mm_ctx_alloc_iu(msg->dst); else ctx = sgsn_mm_ctx_alloc(0, &ra_id); if (!ctx) { reject_cause = GMM_CAUSE_NET_FAIL; goto rejected; } strncpy(ctx->imsi, mi_string, sizeof(ctx->imsi) - 1); #endif } if (ctx->ran_type == MM_CTX_T_GERAN_Gb) { ctx->gb.tlli = msgb_tlli(msg); ctx->gb.llme = llme; } msgid2mmctx(ctx, msg); break; case GSM_MI_TYPE_TMSI: memcpy(&tmsi, mi+1, 4); tmsi = ntohl(tmsi); /* Try to find MM context based on P-TMSI */ if (!ctx) ctx = sgsn_mm_ctx_by_ptmsi(tmsi); if (!ctx) { /* Allocate a context as most of our code expects one. * Context will not have an IMSI ultil ID RESP is received */ if (msg->dst) ctx = sgsn_mm_ctx_alloc_iu(msg->dst); else ctx = sgsn_mm_ctx_alloc(msgb_tlli(msg), &ra_id); ctx->p_tmsi = tmsi; } if (ctx->ran_type == MM_CTX_T_GERAN_Gb) { ctx->gb.tlli = msgb_tlli(msg); ctx->gb.llme = llme; } msgid2mmctx(ctx, msg); break; default: LOGMMCTXP(LOGL_NOTICE, ctx, "Rejecting ATTACH REQUEST with " "MI type %s\n", gsm48_mi_type_name(mi_type)); reject_cause = GMM_CAUSE_MS_ID_NOT_DERIVED; goto rejected; } /* Update MM Context with currient RA and Cell ID */ ctx->ra = ra_id; if (ctx->ran_type == MM_CTX_T_GERAN_Gb) ctx->gb.cell_id = cid; else if (ctx->ran_type == MM_CTX_T_UTRAN_Iu) { unsigned char tmp_rand[16]; struct osmo_auth_vector vec; /* Ki 000102030405060708090a0b0c0d0e0f */ struct osmo_sub_auth_data auth = { .type = OSMO_AUTH_TYPE_GSM, .algo = OSMO_AUTH_ALG_COMP128v1, .u.gsm.ki = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f }, }; //ctx->iu.sac = sac; /* XXX: Hack to make 3G auth work with special SIM card */ ctx->auth_state = SGSN_AUTH_AUTHENTICATE; RAND_bytes(tmp_rand, 16); memset(&vec, 0, sizeof(vec)); osmo_auth_gen_vec(&vec, &auth, tmp_rand); ctx->auth_triplet.key_seq = 0; memcpy(&ctx->auth_triplet.rand, &tmp_rand, sizeof(ctx->auth_triplet.rand)); memcpy(&ctx->auth_triplet.sres, &vec.sres, sizeof(ctx->auth_triplet.sres)); memcpy(&ctx->auth_triplet.kc, &vec.kc, sizeof(ctx->auth_triplet.kc)); } /* Update MM Context with other data */ ctx->drx_parms = drx_par; ctx->ms_radio_access_capa.len = ms_ra_acc_cap_len; memcpy(ctx->ms_radio_access_capa.buf, ms_ra_acc_cap, ctx->ms_radio_access_capa.len); ctx->ms_network_capa.len = msnc_len; memcpy(ctx->ms_network_capa.buf, msnc, msnc_len); #ifdef PTMSI_ALLOC /* Allocate a new P-TMSI (+ P-TMSI signature) and update TLLI */ /* Don't change the P-TMSI if a P-TMSI re-assignment is under way */ if (ctx->mm_state != GMM_COMMON_PROC_INIT) { ctx->p_tmsi_old = ctx->p_tmsi; ctx->p_tmsi = sgsn_alloc_ptmsi(); } ctx->mm_state = GMM_COMMON_PROC_INIT; #endif if (ctx->ran_type == MM_CTX_T_GERAN_Gb) { /* Even if there is no P-TMSI allocated, the MS will * switch from foreign TLLI to local TLLI */ ctx->gb.tlli_new = gprs_tmsi2tlli(ctx->p_tmsi, TLLI_LOCAL); /* Inform LLC layer about new TLLI but keep old active */ gprs_llgmm_assign(ctx->gb.llme, ctx->gb.tlli, ctx->gb.tlli_new, GPRS_ALGO_GEA0, NULL); } ctx->pending_req = GSM48_MT_GMM_ATTACH_REQ; return gsm48_gmm_authorize(ctx); err_inval: LOGPC(DMM, LOGL_INFO, "\n"); reject_cause = GMM_CAUSE_SEM_INCORR_MSG; rejected: /* Send ATTACH REJECT */ LOGMMCTXP(LOGL_NOTICE, ctx, "Rejecting Attach Request with cause '%s' (%d)\n", get_value_string(gsm48_gmm_cause_names, reject_cause), reject_cause); rc = gsm48_tx_gmm_att_rej_oldmsg(msg, reject_cause); if (ctx) mm_ctx_cleanup_free(ctx, "GPRS ATTACH REJ"); else /* TLLI unassignment */ gprs_llgmm_assign(llme, llme->tlli, 0xffffffff, GPRS_ALGO_GEA0, NULL); return rc; } /* Section 4.7.4.1 / 9.4.5.2 MO Detach request */ static int gsm48_rx_gmm_det_req(struct sgsn_mm_ctx *ctx, struct msgb *msg) { struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); uint8_t detach_type, power_off; int rc = 0; detach_type = gh->data[0] & 0x7; power_off = gh->data[0] & 0x8; /* FIXME: In 24.008 there is an optional P-TMSI and P-TMSI signature IE */ LOGMMCTXP(LOGL_INFO, ctx, "-> GMM DETACH REQUEST TLLI=0x%08x type=%s %s\n", msgb_tlli(msg), get_value_string(gprs_det_t_mo_strs, detach_type), power_off ? "Power-off" : ""); /* Only send the Detach Accept (MO) if power off isn't indicated, * see 04.08, 4.7.4.1.2/3 for details */ if (!power_off) { /* force_stby = 0 */ if (ctx) rc = gsm48_tx_gmm_det_ack(ctx, 0); else rc = gsm48_tx_gmm_det_ack_oldmsg(msg, 0); } if (ctx) { struct sgsn_signal_data sig_data; memset(&sig_data, 0, sizeof(sig_data)); sig_data.mm = ctx; osmo_signal_dispatch(SS_SGSN, S_SGSN_DETACH, &sig_data); mm_ctx_cleanup_free(ctx, "GPRS DETACH REQUEST"); } return rc; } /* Chapter 9.4.15: Routing area update accept */ static int gsm48_tx_gmm_ra_upd_ack(struct sgsn_mm_ctx *mm) { struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 UPD ACK"); struct gsm48_hdr *gh; struct gsm48_ra_upd_ack *rua; uint8_t *mid; LOGMMCTXP(LOGL_INFO, mm, "<- ROUTING AREA UPDATE ACCEPT\n"); mmctx2msgid(msg, mm); gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); gh->proto_discr = GSM48_PDISC_MM_GPRS; gh->msg_type = GSM48_MT_GMM_RA_UPD_ACK; rua = (struct gsm48_ra_upd_ack *) msgb_put(msg, sizeof(*rua)); rua->force_stby = 0; /* not indicated */ rua->upd_result = 0; /* RA updated */ rua->ra_upd_timer = gprs_secs_to_tmr_floor(sgsn->cfg.timers.T3312); gsm48_construct_ra(rua->ra_id.digits, &mm->ra); #if 0 /* Optional: P-TMSI signature */ msgb_v_put(msg, GSM48_IE_GMM_PTMSI_SIG); ptsig = msgb_put(msg, 3); ptsig[0] = mm->p_tmsi_sig >> 16; ptsig[1] = mm->p_tmsi_sig >> 8; ptsig[2] = mm->p_tmsi_sig & 0xff; #endif #ifdef PTMSI_ALLOC /* Optional: Allocated P-TMSI */ mid = msgb_put(msg, GSM48_MID_TMSI_LEN); gsm48_generate_mid_from_tmsi(mid, mm->p_tmsi); mid[0] = GSM48_IE_GMM_ALLOC_PTMSI; #endif /* Optional: Negotiated READY timer value */ msgb_tv_put(msg, GSM48_IE_GMM_TIMER_READY, gprs_secs_to_tmr_floor(sgsn->cfg.timers.T3314)); /* Option: MS ID, ... */ return gsm48_gmm_sendmsg(msg, 0, mm); } /* Chapter 9.4.17: Routing area update reject */ static int gsm48_tx_gmm_ra_upd_rej(struct msgb *old_msg, uint8_t cause) { struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 RA UPD REJ"); struct gsm48_hdr *gh; LOGP(DMM, LOGL_NOTICE, "<- ROUTING AREA UPDATE REJECT\n"); gmm_copy_id(msg, old_msg); gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 2); gh->proto_discr = GSM48_PDISC_MM_GPRS; gh->msg_type = GSM48_MT_GMM_RA_UPD_REJ; gh->data[0] = cause; gh->data[1] = 0; /* ? */ /* Option: P-TMSI signature, allocated P-TMSI, MS ID, ... */ return gsm48_gmm_sendmsg(msg, 0, NULL); } static void process_ms_ctx_status(struct sgsn_mm_ctx *mmctx, const uint8_t *pdp_status) { struct sgsn_pdp_ctx *pdp, *pdp2; /* 24.008 4.7.5.1.3: If the PDP context status information element is * included in ROUTING AREA UPDATE REQUEST message, then the network * shall deactivate all those PDP contexts locally (without peer to * peer signalling between the MS and the network), which are not in SM * state PDP-INACTIVE on network side but are indicated by the MS as * being in state PDP-INACTIVE. */ llist_for_each_entry_safe(pdp, pdp2, &mmctx->pdp_list, list) { if (pdp->nsapi < 8) { if (!(pdp_status[0] & (1 << pdp->nsapi))) { LOGMMCTXP(LOGL_NOTICE, mmctx, "Dropping PDP context for NSAPI=%u " "due to PDP CTX STATUS IE= 0x%02x%02x\n", pdp->nsapi, pdp_status[1], pdp_status[0]); sgsn_delete_pdp_ctx(pdp); } } else { if (!(pdp_status[1] & (1 << (pdp->nsapi - 8)))) { LOGMMCTXP(LOGL_NOTICE, mmctx, "Dropping PDP context for NSAPI=%u " "due to PDP CTX STATUS IE= 0x%02x%02x\n", pdp->nsapi, pdp_status[1], pdp_status[0]); sgsn_delete_pdp_ctx(pdp); } } } } /* Chapter 9.4.14: Routing area update request */ static int gsm48_rx_gmm_ra_upd_req(struct sgsn_mm_ctx *mmctx, struct msgb *msg, struct gprs_llc_llme *llme) { #ifndef PTMSI_ALLOC struct sgsn_signal_data sig_data; #endif struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); uint8_t *cur = gh->data; uint8_t ms_ra_acc_cap_len; struct gprs_ra_id old_ra_id; struct tlv_parsed tp; uint8_t upd_type; enum gsm48_gmm_cause reject_cause; int rc; /* TODO: In iu mode - handle follow-on request */ /* Update Type 10.5.5.18 */ upd_type = *cur++ & 0x07; LOGP(DMM, LOGL_INFO, "-> GMM RA UPDATE REQUEST type=\"%s\"\n", get_value_string(gprs_upd_t_strs, upd_type)); /* Old routing area identification 10.5.5.15 */ gsm48_parse_ra(&old_ra_id, cur); cur += 6; /* MS Radio Access Capability 10.5.5.12a */ ms_ra_acc_cap_len = *cur++; if (ms_ra_acc_cap_len > 52) { reject_cause = GMM_CAUSE_PROTO_ERR_UNSPEC; goto rejected; } cur += ms_ra_acc_cap_len; /* Optional: Old P-TMSI Signature, Requested READY timer, TMSI Status, * DRX parameter, MS network capability */ tlv_parse(&tp, &gsm48_gmm_att_tlvdef, cur, (msg->data + msg->len) - cur, 0, 0); switch (upd_type) { case GPRS_UPD_T_RA_LA: case GPRS_UPD_T_RA_LA_IMSI_ATT: LOGP(DMM, LOGL_NOTICE, "Update type %i unsupported in Mode III, is your SI13 corrupt?\n", upd_type); reject_cause = GMM_CAUSE_PROTO_ERR_UNSPEC; goto rejected; case GPRS_UPD_T_RA: case GPRS_UPD_T_PERIODIC: break; } #warning "Differentiate look-up between Iu and Gb" if (!mmctx) { /* BSSGP doesn't give us an mmctx */ /* TODO: Check if there is an MM CTX with old_ra_id and * the P-TMSI (if given, reguired for UMTS) or as last resort * if the TLLI matches foreign_tlli (P-TMSI). Note that this * is an optimization to avoid the RA reject (impl detached) * below, which will cause a new attach cycle. */ /* Look-up the MM context based on old RA-ID and TLLI */ if (!msg->dst) { mmctx = sgsn_mm_ctx_by_tlli_and_ptmsi(msgb_tlli(msg), &old_ra_id); } else if (TLVP_PRESENT(&tp, GSM48_IE_GMM_ALLOC_PTMSI)) { /* In Iu mode search only for ptmsi */ char mi_string[GSM48_MI_SIZE]; uint8_t mi_len = TLVP_LEN(&tp, GSM48_IE_GMM_ALLOC_PTMSI); uint8_t *mi = TLVP_VAL(&tp, GSM48_IE_GMM_ALLOC_PTMSI); uint8_t mi_type = *mi & GSM_MI_TYPE_MASK; uint32_t tmsi; gsm48_mi_to_string(mi_string, sizeof(mi_string), mi, mi_len); if (mi_type == GSM_MI_TYPE_TMSI) { memcpy(&tmsi, mi+1, 4); tmsi = ntohl(tmsi); mmctx = sgsn_mm_ctx_by_ptmsi(tmsi); } } if (mmctx) { LOGMMCTXP(LOGL_INFO, mmctx, "Looked up by matching TLLI and P_TMSI. " "BSSGP TLLI: %08x, P-TMSI: %08x (%08x), " "TLLI: %08x (%08x), RA: %d-%d-%d-%d\n", msgb_tlli(msg), mmctx->p_tmsi, mmctx->p_tmsi_old, mmctx->gb.tlli, mmctx->gb.tlli_new, mmctx->ra.mcc, mmctx->ra.mnc, mmctx->ra.lac, mmctx->ra.rac); mmctx->mm_state = GMM_COMMON_PROC_INIT; } } else if (!gprs_ra_id_equals(&mmctx->ra, &old_ra_id) || mmctx->mm_state == GMM_DEREGISTERED) { /* We cannot use the mmctx */ LOGMMCTXP(LOGL_INFO, mmctx, "The MM context cannot be used, RA: %d-%d-%d-%d\n", mmctx->ra.mcc, mmctx->ra.mnc, mmctx->ra.lac, mmctx->ra.rac); mmctx = NULL; } if (!mmctx) { if (llme) { /* send a XID reset to re-set all LLC sequence numbers * in the MS */ LOGMMCTXP(LOGL_NOTICE, mmctx, "LLC XID RESET\n"); gprs_llgmm_reset(llme); } /* The MS has to perform GPRS attach */ /* Device is still IMSI attached for CS but initiate GPRS ATTACH, * see GSM 04.08, 4.7.5.1.4 and G.6 */ reject_cause = GMM_CAUSE_IMPL_DETACHED; goto rejected; } /* Store new BVCI/NSEI in MM context (FIXME: delay until we ack?) */ msgid2mmctx(mmctx, msg); /* Bump the statistics of received signalling msgs for this MM context */ rate_ctr_inc(&mmctx->ctrg->ctr[GMM_CTR_PKTS_SIG_IN]); /* Update the MM context with the new RA-ID */ #warning "how to obtain RA_ID in Iu case?" if (mmctx->ran_type == MM_CTX_T_GERAN_Gb) { bssgp_parse_cell_id(&mmctx->ra, msgb_bcid(msg)); /* Update the MM context with the new (i.e. foreign) TLLI */ mmctx->gb.tlli = msgb_tlli(msg); } /* FIXME: Update the MM context with the MS radio acc capabilities */ /* FIXME: Update the MM context with the MS network capabilities */ rate_ctr_inc(&mmctx->ctrg->ctr[GMM_CTR_RA_UPDATE]); #ifdef PTMSI_ALLOC /* Don't change the P-TMSI if a P-TMSI re-assignment is under way */ if (mmctx->mm_state != GMM_COMMON_PROC_INIT) { mmctx->p_tmsi_old = mmctx->p_tmsi; mmctx->p_tmsi = sgsn_alloc_ptmsi(); } /* Start T3350 and re-transmit up to 5 times until ATTACH COMPLETE */ mmctx->t3350_mode = GMM_T3350_MODE_RAU; mmctx_timer_start(mmctx, 3350, sgsn->cfg.timers.T3350); mmctx->mm_state = GMM_COMMON_PROC_INIT; #else /* Make sure we are NORMAL (i.e. not SUSPENDED anymore) */ mmctx->mm_state = GMM_REGISTERED_NORMAL; memset(&sig_data, 0, sizeof(sig_data)); sig_data.mm = mmctx; osmo_signal_dispatch(SS_SGSN, S_SGSN_UPDATE, &sig_data); #endif if (mmctx->ran_type == MM_CTX_T_GERAN_Gb) { /* Even if there is no P-TMSI allocated, the MS will switch from * foreign TLLI to local TLLI */ mmctx->gb.tlli_new = gprs_tmsi2tlli(mmctx->p_tmsi, TLLI_LOCAL); /* Inform LLC layer about new TLLI but keep old active */ gprs_llgmm_assign(mmctx->gb.llme, mmctx->gb.tlli, mmctx->gb.tlli_new, GPRS_ALGO_GEA0, NULL); } /* Look at PDP Context Status IE and see if MS's view of * activated/deactivated NSAPIs agrees with our view */ if (TLVP_PRESENT(&tp, GSM48_IE_GMM_PDP_CTX_STATUS)) { const uint8_t *pdp_status = TLVP_VAL(&tp, GSM48_IE_GMM_PDP_CTX_STATUS); process_ms_ctx_status(mmctx, pdp_status); } mmctx->pending_req = GSM48_MT_GMM_RA_UPD_REQ; /* Send RA UPDATE ACCEPT */ return gsm48_gmm_authorize(mmctx); rejected: /* Send RA UPDATE REJECT */ LOGMMCTXP(LOGL_NOTICE, mmctx, "Rejecting RA Update Request with cause '%s' (%d)\n", get_value_string(gsm48_gmm_cause_names, reject_cause), reject_cause); rc = gsm48_tx_gmm_ra_upd_rej(msg, reject_cause); if (mmctx) mm_ctx_cleanup_free(mmctx, "GPRS RA UPDATE REJ"); else { if (llme) { /* TLLI unassignment */ gprs_llgmm_assign(llme, llme->tlli, 0xffffffff, GPRS_ALGO_GEA0, NULL); } } return rc; } /* 3GPP TS 24.008 Section 9.4.20 Service request */ static int gsm48_rx_gmm_service_req(struct sgsn_mm_ctx *ctx, struct msgb *msg) { struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); uint8_t *cur = gh->data, *mi; uint8_t ciph_seq_nr, service_type, mi_len, mi_type; uint32_t tmsi; struct tlv_parsed tp; char mi_string[GSM48_MI_SIZE]; uint16_t cid = 0; enum gsm48_gmm_cause reject_cause; int rc; LOGMMCTXP(LOGL_INFO, ctx, "-> GMM SERVICE REQUEST "); /* This message is only valid in Iu mode */ if (!msg->dst) { LOGPC(DMM, LOGL_INFO, "Invalid if not in Iu mode\n"); return -1; } /* Skip Ciphering key sequence number 10.5.1.2 */ ciph_seq_nr = *cur & 0x07; /* Service type 10.5.5.20 */ service_type = (*cur++ >> 4) & 0x07; /* Mobile Identity (P-TMSI or IMSI) 10.5.1.4 */ mi_len = *cur++; mi = cur; if (mi_len > 8) goto err_inval; mi_type = *mi & GSM_MI_TYPE_MASK; cur += mi_len; gsm48_mi_to_string(mi_string, sizeof(mi_string), mi, mi_len); DEBUGPC(DMM, "MI(%s) type=\"%s\" ", mi_string, get_value_string(gprs_service_t_strs, service_type)); LOGPC(DMM, LOGL_INFO, "\n"); /* Optional: PDP context status, MBMS context status, Uplink data status, Device properties */ tlv_parse(&tp, &gsm48_gmm_att_tlvdef, cur, (msg->data + msg->len) - cur, 0, 0); switch (mi_type) { case GSM_MI_TYPE_IMSI: /* Try to find MM context based on IMSI */ if (!ctx) ctx = sgsn_mm_ctx_by_imsi(mi_string); if (!ctx) { /* FIXME: We need to have a context for service request? */ reject_cause = GMM_CAUSE_NET_FAIL; goto rejected; } msgid2mmctx(ctx, msg); break; case GSM_MI_TYPE_TMSI: memcpy(&tmsi, mi+1, 4); tmsi = ntohl(tmsi); /* Try to find MM context based on P-TMSI */ if (!ctx) ctx = sgsn_mm_ctx_by_ptmsi(tmsi); if (!ctx) { /* FIXME: We need to have a context for service request? */ reject_cause = GMM_CAUSE_NET_FAIL; goto rejected; } msgid2mmctx(ctx, msg); break; default: LOGMMCTXP(LOGL_NOTICE, ctx, "Rejecting SERVICE REQUEST with " "MI type %s\n", gsm48_mi_type_name(mi_type)); reject_cause = GMM_CAUSE_MS_ID_NOT_DERIVED; goto rejected; } ctx->mm_state = GMM_COMMON_PROC_INIT; ctx->iu.service.type = service_type; /* TODO: Handle those only in case of accept? */ /* Look at PDP Context Status IE and see if MS's view of * activated/deactivated NSAPIs agrees with our view */ if (TLVP_PRESENT(&tp, GSM48_IE_GMM_PDP_CTX_STATUS)) { const uint8_t *pdp_status = TLVP_VAL(&tp, GSM48_IE_GMM_PDP_CTX_STATUS); process_ms_ctx_status(ctx, pdp_status); } ctx->pending_req = GSM48_MT_GMM_SERVICE_REQ; return gsm48_gmm_authorize(ctx); err_inval: LOGPC(DMM, LOGL_INFO, "\n"); reject_cause = GMM_CAUSE_SEM_INCORR_MSG; rejected: /* Send SERVICE REJECT */ LOGMMCTXP(LOGL_NOTICE, ctx, "Rejecting Service Request with cause '%s' (%d)\n", get_value_string(gsm48_gmm_cause_names, reject_cause), reject_cause); rc = gsm48_tx_gmm_service_rej_oldmsg(msg, reject_cause); return rc; } static int gsm48_rx_gmm_status(struct sgsn_mm_ctx *mmctx, struct msgb *msg) { struct gsm48_hdr *gh = msgb_l3(msg); LOGMMCTXP(LOGL_INFO, mmctx, "-> GPRS MM STATUS (cause: %s)\n", get_value_string(gsm48_gmm_cause_names, gh->data[0])); return 0; } /* GPRS Mobility Management */ static int gsm0408_rcv_gmm(struct sgsn_mm_ctx *mmctx, struct msgb *msg, struct gprs_llc_llme *llme) { struct sgsn_signal_data sig_data; struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); int rc; /* MMCTX can be NULL when called */ if (llme && !mmctx && gh->msg_type != GSM48_MT_GMM_ATTACH_REQ && gh->msg_type != GSM48_MT_GMM_RA_UPD_REQ) { LOGP(DMM, LOGL_NOTICE, "Cannot handle GMM for unknown MM CTX\n"); /* 4.7.10 */ if (gh->msg_type == GSM48_MT_GMM_STATUS) { /* TLLI unassignment */ gprs_llgmm_assign(llme, llme->tlli, 0xffffffff, GPRS_ALGO_GEA0, NULL); return 0; } /* Don't reply or establish a LLME on DETACH_ACK */ if (gh->msg_type == GSM48_MT_GMM_DETACH_ACK) { /* TLLI unassignment */ return gprs_llgmm_assign(llme, llme->tlli, 0xffffffff, GPRS_ALGO_GEA0, NULL); } gprs_llgmm_reset(llme); /* Don't force it into re-attachment */ if (gh->msg_type == GSM48_MT_GMM_DETACH_REQ) { /* Handle Detach Request */ rc = gsm48_rx_gmm_det_req(NULL, msg); /* TLLI unassignment */ gprs_llgmm_assign(llme, llme->tlli, 0xffffffff, GPRS_ALGO_GEA0, NULL); return rc; } /* Force the MS to re-attach */ rc = sgsn_force_reattach_oldmsg(msg); /* TLLI unassignment */ gprs_llgmm_assign(llme, llme->tlli, 0xffffffff, GPRS_ALGO_GEA0, NULL); return rc; } switch (gh->msg_type) { case GSM48_MT_GMM_RA_UPD_REQ: rc = gsm48_rx_gmm_ra_upd_req(mmctx, msg, llme); break; case GSM48_MT_GMM_ATTACH_REQ: rc = gsm48_rx_gmm_att_req(mmctx, msg, llme); break; case GSM48_MT_GMM_SERVICE_REQ: rc = gsm48_rx_gmm_service_req(mmctx, msg); break; default: break; } /* For all the following types mmctx can not be NULL */ if (!mmctx) { /* FIXME: return some error? */ return -1; } switch (gh->msg_type) { case GSM48_MT_GMM_ID_RESP: rc = gsm48_rx_gmm_id_resp(mmctx, msg); break; case GSM48_MT_GMM_STATUS: rc = gsm48_rx_gmm_status(mmctx, msg); break; case GSM48_MT_GMM_DETACH_REQ: rc = gsm48_rx_gmm_det_req(mmctx, msg); break; case GSM48_MT_GMM_DETACH_ACK: LOGMMCTXP(LOGL_INFO, mmctx, "-> DETACH ACK\n"); mm_ctx_cleanup_free(mmctx, "GPRS DETACH ACK"); rc = 0; break; case GSM48_MT_GMM_ATTACH_COMPL: /* only in case SGSN offered new P-TMSI */ LOGMMCTXP(LOGL_INFO, mmctx, "-> ATTACH COMPLETE\n"); mmctx_timer_stop(mmctx, 3350); mmctx->t3350_mode = GMM_T3350_MODE_NONE; mmctx->p_tmsi_old = 0; mmctx->pending_req = 0; if (mmctx->ran_type == MM_CTX_T_GERAN_Gb) { /* Unassign the old TLLI */ mmctx->gb.tlli = mmctx->gb.tlli_new; gprs_llgmm_assign(mmctx->gb.llme, 0xffffffff, mmctx->gb.tlli_new, GPRS_ALGO_GEA0, NULL); } mmctx->mm_state = GMM_REGISTERED_NORMAL; rc = 0; memset(&sig_data, 0, sizeof(sig_data)); sig_data.mm = mmctx; osmo_signal_dispatch(SS_SGSN, S_SGSN_ATTACH, &sig_data); break; case GSM48_MT_GMM_RA_UPD_COMPL: /* only in case SGSN offered new P-TMSI */ LOGMMCTXP(LOGL_INFO, mmctx, "-> ROUTING AREA UPDATE COMPLETE\n"); mmctx_timer_stop(mmctx, 3350); mmctx->t3350_mode = GMM_T3350_MODE_NONE; mmctx->p_tmsi_old = 0; mmctx->pending_req = 0; if (mmctx->ran_type == MM_CTX_T_GERAN_Gb) { /* Unassign the old TLLI */ mmctx->gb.tlli = mmctx->gb.tlli_new; gprs_llgmm_assign(mmctx->gb.llme, 0xffffffff, mmctx->gb.tlli_new, GPRS_ALGO_GEA0, NULL); } mmctx->mm_state = GMM_REGISTERED_NORMAL; activate_pdp_rabs(mmctx); rc = 0; memset(&sig_data, 0, sizeof(sig_data)); sig_data.mm = mmctx; osmo_signal_dispatch(SS_SGSN, S_SGSN_UPDATE, &sig_data); break; case GSM48_MT_GMM_PTMSI_REALL_COMPL: LOGMMCTXP(LOGL_INFO, mmctx, "-> PTMSI REALLLICATION COMPLETE\n"); mmctx_timer_stop(mmctx, 3350); mmctx->t3350_mode = GMM_T3350_MODE_NONE; mmctx->p_tmsi_old = 0; mmctx->pending_req = 0; if (mmctx->ran_type == MM_CTX_T_GERAN_Gb) { /* Unassign the old TLLI */ mmctx->gb.tlli = mmctx->gb.tlli_new; //gprs_llgmm_assign(mmctx->gb.llme, 0xffffffff, mmctx->gb.tlli_new, GPRS_ALGO_GEA0, NULL); } rc = 0; break; case GSM48_MT_GMM_AUTH_CIPH_RESP: rc = gsm48_rx_gmm_auth_ciph_resp(mmctx, msg); break; default: LOGMMCTXP(LOGL_NOTICE, mmctx, "Unknown GSM 04.08 GMM msg type 0x%02x\n", gh->msg_type); rc = gsm48_tx_gmm_status(mmctx, GMM_CAUSE_MSGT_NOTEXIST_NOTIMPL); break; } return rc; } static void mmctx_timer_cb(void *_mm) { struct sgsn_mm_ctx *mm = _mm; struct gsm_auth_tuple *at; mm->num_T_exp++; switch (mm->T) { case 3350: /* waiting for ATTACH COMPLETE */ if (mm->num_T_exp >= 5) { LOGMMCTXP(LOGL_NOTICE, mm, "T3350 expired >= 5 times\n"); mm_ctx_cleanup_free(mm, "T3350"); /* FIXME: should we return some error? */ break; } /* re-transmit the respective msg and re-start timer */ switch (mm->t3350_mode) { case GMM_T3350_MODE_ATT: gsm48_tx_gmm_att_ack(mm); break; case GMM_T3350_MODE_RAU: gsm48_tx_gmm_ra_upd_ack(mm); break; case GMM_T3350_MODE_PTMSI_REALL: /* FIXME */ break; case GMM_T3350_MODE_NONE: LOGMMCTXP(LOGL_NOTICE, mm, "T3350 mode wasn't set, ignoring timeout\n"); break; } osmo_timer_schedule(&mm->timer, sgsn->cfg.timers.T3350, 0); break; case 3360: /* waiting for AUTH AND CIPH RESP */ if (mm->num_T_exp >= 5) { LOGMMCTXP(LOGL_NOTICE, mm, "T3360 expired >= 5 times\n"); mm_ctx_cleanup_free(mm, "T3360"); break; } /* Re-transmit the respective msg and re-start timer */ if (mm->auth_triplet.key_seq == GSM_KEY_SEQ_INVAL) { LOGMMCTXP(LOGL_ERROR, mm, "timeout: invalid auth triplet reference\n"); mm_ctx_cleanup_free(mm, "T3360"); break; } at = &mm->auth_triplet; gsm48_tx_gmm_auth_ciph_req(mm, at->rand, at->key_seq, GPRS_ALGO_GEA0); osmo_timer_schedule(&mm->timer, sgsn->cfg.timers.T3360, 0); break; case 3370: /* waiting for IDENTITY RESPONSE */ if (mm->num_T_exp >= 5) { LOGMMCTXP(LOGL_NOTICE, mm, "T3370 expired >= 5 times\n"); gsm48_tx_gmm_att_rej(mm, GMM_CAUSE_MS_ID_NOT_DERIVED); mm_ctx_cleanup_free(mm, "GPRS ATTACH REJECT (T3370)"); break; } /* re-tranmit IDENTITY REQUEST and re-start timer */ gsm48_tx_gmm_id_req(mm, mm->t3370_id_type); osmo_timer_schedule(&mm->timer, sgsn->cfg.timers.T3370, 0); break; default: LOGMMCTXP(LOGL_ERROR, mm, "timer expired in unknown mode %u\n", mm->T); } } /* GPRS SESSION MANAGEMENT */ static void pdpctx_timer_cb(void *_mm); static void pdpctx_timer_start(struct sgsn_pdp_ctx *pdp, unsigned int T, unsigned int seconds) { if (osmo_timer_pending(&pdp->timer)) LOGMMCTXP(LOGL_ERROR, pdp->mm, "Starting MM timer %u while old " "timer %u pending\n", T, pdp->T); pdp->T = T; pdp->num_T_exp = 0; /* FIXME: we should do this only once ? */ pdp->timer.data = pdp; pdp->timer.cb = &pdpctx_timer_cb; osmo_timer_schedule(&pdp->timer, seconds, 0); } #if 0 static void msgb_put_pdp_addr_ipv4(struct msgb *msg, uint32_t ipaddr) { uint8_t v[6]; v[0] = PDP_TYPE_ORG_IETF; v[1] = PDP_TYPE_N_IETF_IPv4; *(uint32_t *)(v+2) = htonl(ipaddr); msgb_tlv_put(msg, GSM48_IE_GSM_PDP_ADDR, sizeof(v), v); } static void msgb_put_pdp_addr_ppp(struct msgb *msg) { uint8_t v[2]; v[0] = PDP_TYPE_ORG_ETSI; v[1] = PDP_TYPE_N_ETSI_PPP; msgb_tlv_put(msg, GSM48_IE_GSM_PDP_ADDR, sizeof(v), v); } #endif /* Section 9.5.2: Ativate PDP Context Accept */ int gsm48_tx_gsm_act_pdp_acc(struct sgsn_pdp_ctx *pdp) { struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 PDP ACC"); struct gsm48_hdr *gh; uint8_t transaction_id = pdp->ti ^ 0x8; /* flip */ LOGPDPCTXP(LOGL_INFO, pdp, "<- ACTIVATE PDP CONTEXT ACK\n"); mmctx2msgid(msg, pdp->mm); gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); gh->proto_discr = GSM48_PDISC_SM_GPRS | (transaction_id << 4); gh->msg_type = GSM48_MT_GSM_ACT_PDP_ACK; /* Negotiated LLC SAPI */ msgb_v_put(msg, pdp->sapi); /* FIXME: copy QoS parameters from original request */ //msgb_lv_put(msg, pdp->lib->qos_neg.l, pdp->lib->qos_neg.v); msgb_lv_put(msg, sizeof(default_qos), (uint8_t *)&default_qos); /* Radio priority 10.5.7.2 */ msgb_v_put(msg, pdp->lib->radio_pri); /* PDP address */ /* Highest 4 bits of first byte need to be set to 1, otherwise * the IE is identical with the 04.08 PDP Address IE */ pdp->lib->eua.v[0] &= ~0xf0; msgb_tlv_put(msg, GSM48_IE_GSM_PDP_ADDR, pdp->lib->eua.l, pdp->lib->eua.v); pdp->lib->eua.v[0] |= 0xf0; /* Optional: Protocol configuration options (FIXME: why 'req') */ if (pdp->lib->pco_req.l) msgb_tlv_put(msg, GSM48_IE_GSM_PROTO_CONF_OPT, pdp->lib->pco_req.l, pdp->lib->pco_req.v); /* Optional: Packet Flow Identifier */ return gsm48_gmm_sendmsg(msg, 0, pdp->mm); } /* Section 9.5.3: Activate PDP Context reject */ int gsm48_tx_gsm_act_pdp_rej(struct sgsn_mm_ctx *mm, uint8_t tid, uint8_t cause, uint8_t pco_len, uint8_t *pco_v) { struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 PDP REJ"); struct gsm48_hdr *gh; uint8_t transaction_id = tid ^ 0x8; /* flip */ LOGMMCTXP(LOGL_NOTICE, mm, "<- ACTIVATE PDP CONTEXT REJ(cause=%u)\n", cause); mmctx2msgid(msg, mm); gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); gh->proto_discr = GSM48_PDISC_SM_GPRS | (transaction_id << 4); gh->msg_type = GSM48_MT_GSM_ACT_PDP_REJ; msgb_v_put(msg, cause); if (pco_len && pco_v) msgb_tlv_put(msg, GSM48_IE_GSM_PROTO_CONF_OPT, pco_len, pco_v); return gsm48_gmm_sendmsg(msg, 0, mm); } /* Section 9.5.8: Deactivate PDP Context Request */ static int _gsm48_tx_gsm_deact_pdp_req(struct sgsn_mm_ctx *mm, uint8_t tid, uint8_t sm_cause) { struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 PDP DET REQ"); struct gsm48_hdr *gh; uint8_t transaction_id = tid ^ 0x8; /* flip */ LOGMMCTXP(LOGL_INFO, mm, "<- DEACTIVATE PDP CONTEXT REQ\n"); mmctx2msgid(msg, mm); gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); gh->proto_discr = GSM48_PDISC_SM_GPRS | (transaction_id << 4); gh->msg_type = GSM48_MT_GSM_DEACT_PDP_REQ; msgb_v_put(msg, sm_cause); return gsm48_gmm_sendmsg(msg, 0, mm); } int gsm48_tx_gsm_deact_pdp_req(struct sgsn_pdp_ctx *pdp, uint8_t sm_cause) { pdpctx_timer_start(pdp, 3395, sgsn->cfg.timers.T3395); return _gsm48_tx_gsm_deact_pdp_req(pdp->mm, pdp->ti, sm_cause); } /* Section 9.5.9: Deactivate PDP Context Accept */ static int _gsm48_tx_gsm_deact_pdp_acc(struct sgsn_mm_ctx *mm, uint8_t tid) { struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 PDP DET ACC"); struct gsm48_hdr *gh; uint8_t transaction_id = tid ^ 0x8; /* flip */ LOGMMCTXP(LOGL_INFO, mm, "<- DEACTIVATE PDP CONTEXT ACK\n"); mmctx2msgid(msg, mm); gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); gh->proto_discr = GSM48_PDISC_SM_GPRS | (transaction_id << 4); gh->msg_type = GSM48_MT_GSM_DEACT_PDP_ACK; return gsm48_gmm_sendmsg(msg, 0, mm); } int gsm48_tx_gsm_deact_pdp_acc(struct sgsn_pdp_ctx *pdp) { return _gsm48_tx_gsm_deact_pdp_acc(pdp->mm, pdp->ti); } static int activate_ggsn(struct sgsn_mm_ctx *mmctx, struct sgsn_ggsn_ctx *ggsn, const uint8_t transaction_id, const uint8_t req_nsapi, const uint8_t req_llc_sapi, struct tlv_parsed *tp, int destroy_ggsn) { struct sgsn_pdp_ctx *pdp; LOGMMCTXP(LOGL_DEBUG, mmctx, "Using GGSN %u\n", ggsn->id); ggsn->gsn = sgsn->gsn; pdp = sgsn_create_pdp_ctx(ggsn, mmctx, req_nsapi, tp); if (!pdp) return -1; /* Store SAPI and Transaction Identifier */ pdp->sapi = req_llc_sapi; pdp->ti = transaction_id; pdp->destroy_ggsn = destroy_ggsn; return 0; } static void ggsn_lookup_cb(void *arg, int status, int timeouts, struct hostent *hostent) { struct sgsn_ggsn_ctx *ggsn; struct sgsn_ggsn_lookup *lookup = arg; struct in_addr *addr = NULL; /* The context is gone while we made a request */ if (!lookup->mmctx) { talloc_free(lookup); return; } if (status != ARES_SUCCESS) { struct sgsn_mm_ctx *mmctx = lookup->mmctx; LOGMMCTXP(LOGL_ERROR, mmctx, "DNS query failed.\n"); /* Need to try with three digits now */ if (lookup->state == SGSN_GGSN_2DIGIT) { char *hostname; int rc; lookup->state = SGSN_GGSN_3DIGIT; hostname = osmo_apn_qualify_from_imsi(mmctx->imsi, lookup->apn_str, 1); LOGMMCTXP(LOGL_DEBUG, mmctx, "Going to query %s\n", hostname); rc = sgsn_ares_query(sgsn, hostname, ggsn_lookup_cb, lookup); if (rc != 0) { LOGMMCTXP(LOGL_ERROR, mmctx, "Couldn't start GGSN\n"); goto reject_due_failure; } return; } LOGMMCTXP(LOGL_ERROR, mmctx, "Couldn't resolve GGSN\n"); goto reject_due_failure; } if (hostent->h_length != sizeof(struct in_addr)) { LOGMMCTXP(LOGL_ERROR, lookup->mmctx, "Wrong addr size(%zu)\n", sizeof(struct in_addr)); goto reject_due_failure; } /* Get the first addr from the list */ addr = (struct in_addr *) hostent->h_addr_list[0]; if (!addr) { LOGMMCTXP(LOGL_ERROR, lookup->mmctx, "No host address.\n"); goto reject_due_failure; } ggsn = sgsn_ggsn_ctx_alloc(UINT32_MAX); if (!ggsn) { LOGMMCTXP(LOGL_ERROR, lookup->mmctx, "Failed to create ggsn.\n"); goto reject_due_failure; } ggsn->remote_addr = *addr; LOGMMCTXP(LOGL_NOTICE, lookup->mmctx, "Selected %s as GGSN.\n", inet_ntoa(*addr)); /* forget about the ggsn look-up */ lookup->mmctx->ggsn_lookup = NULL; activate_ggsn(lookup->mmctx, ggsn, lookup->ti, lookup->nsapi, lookup->sapi, &lookup->tp, 1); /* Now free it */ talloc_free(lookup); return; reject_due_failure: gsm48_tx_gsm_act_pdp_rej(lookup->mmctx, lookup->ti, GMM_CAUSE_NET_FAIL, 0, NULL); lookup->mmctx->ggsn_lookup = NULL; talloc_free(lookup); } static int do_act_pdp_req(struct sgsn_mm_ctx *mmctx, struct msgb *msg) { struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); struct gsm48_act_pdp_ctx_req *act_req = (struct gsm48_act_pdp_ctx_req *) gh->data; uint8_t req_qos_len, req_pdpa_len; uint8_t *req_qos, *req_pdpa; struct tlv_parsed tp; uint8_t transaction_id = gsm48_hdr_trans_id(gh); struct sgsn_ggsn_ctx *ggsn; struct sgsn_pdp_ctx *pdp; enum gsm48_gsm_cause gsm_cause; char apn_str[GSM_APN_LENGTH] = { 0, }; char *hostname; int rc; LOGMMCTXP(LOGL_INFO, mmctx, "-> ACTIVATE PDP CONTEXT REQ: SAPI=%u NSAPI=%u ", act_req->req_llc_sapi, act_req->req_nsapi); /* FIXME: length checks! */ req_qos_len = act_req->data[0]; req_qos = act_req->data + 1; /* 10.5.6.5 */ req_pdpa_len = act_req->data[1 + req_qos_len]; req_pdpa = act_req->data + 1 + req_qos_len + 1; /* 10.5.6.4 */ switch (req_pdpa[0] & 0xf) { case 0x0: DEBUGPC(DMM, "ETSI "); break; case 0x1: DEBUGPC(DMM, "IETF "); break; case 0xf: DEBUGPC(DMM, "Empty "); break; } switch (req_pdpa[1]) { case 0x21: DEBUGPC(DMM, "IPv4 "); if (req_pdpa_len >= 6) { struct in_addr ia; ia.s_addr = ntohl(*((uint32_t *) (req_pdpa+2))); DEBUGPC(DMM, "%s ", inet_ntoa(ia)); } break; case 0x57: DEBUGPC(DMM, "IPv6 "); if (req_pdpa_len >= 18) { /* FIXME: print IPv6 address */ } break; default: DEBUGPC(DMM, "0x%02x ", req_pdpa[1]); break; } LOGPC(DMM, LOGL_INFO, "\n"); /* Check if NSAPI is out of range (TS 04.65 / 7.2) */ if (act_req->req_nsapi < 5 || act_req->req_nsapi > 15) { /* Send reject with GSM_CAUSE_INV_MAND_INFO */ return gsm48_tx_gsm_act_pdp_rej(mmctx, transaction_id, GSM_CAUSE_INV_MAND_INFO, 0, NULL); } /* Optional: Access Point Name, Protocol Config Options */ if (req_pdpa + req_pdpa_len < msg->data + msg->len) tlv_parse(&tp, &gsm48_sm_att_tlvdef, req_pdpa + req_pdpa_len, (msg->data + msg->len) - (req_pdpa + req_pdpa_len), 0, 0); else memset(&tp, 0, sizeof(tp)); /* put the non-TLV elements in the TLV parser structure to * pass them on to the SGSN / GTP code */ tp.lv[OSMO_IE_GSM_REQ_QOS].len = req_qos_len; tp.lv[OSMO_IE_GSM_REQ_QOS].val = req_qos; tp.lv[OSMO_IE_GSM_REQ_PDP_ADDR].len = req_pdpa_len; tp.lv[OSMO_IE_GSM_REQ_PDP_ADDR].val = req_pdpa; /* Check if NSAPI is already in use */ pdp = sgsn_pdp_ctx_by_nsapi(mmctx, act_req->req_nsapi); if (pdp) { /* We already have a PDP context for this TLLI + NSAPI tuple */ if (pdp->sapi == act_req->req_llc_sapi && pdp->ti == transaction_id) { /* This apparently is a re-transmission of a PDP CTX * ACT REQ (our ACT ACK must have got dropped) */ return gsm48_tx_gsm_act_pdp_acc(pdp); } /* Send reject with GSM_CAUSE_NSAPI_IN_USE */ return gsm48_tx_gsm_act_pdp_rej(mmctx, transaction_id, GSM_CAUSE_NSAPI_IN_USE, 0, NULL); } if (mmctx->ggsn_lookup) { if (mmctx->ggsn_lookup->sapi == act_req->req_llc_sapi && mmctx->ggsn_lookup->ti == transaction_id) { LOGMMCTXP(LOGL_NOTICE, mmctx, "Re-transmission while doing look-up. Ignoring.\n"); return 0; } } /* Only increment counter for a real activation, after we checked * for re-transmissions */ rate_ctr_inc(&mmctx->ctrg->ctr[GMM_CTR_PDP_CTX_ACT]); /* Determine GGSN based on APN and subscription options */ ggsn = sgsn_mm_ctx_find_ggsn_ctx(mmctx, &tp, &gsm_cause, apn_str); if (ggsn) return activate_ggsn(mmctx, ggsn, transaction_id, act_req->req_nsapi, act_req->req_llc_sapi, &tp, 0); if (strlen(apn_str) == 0) goto no_context; if (!sgsn->cfg.dynamic_lookup) goto no_context; /* schedule a dynamic look-up */ mmctx->ggsn_lookup = talloc_zero(tall_bsc_ctx, struct sgsn_ggsn_lookup); if (!mmctx->ggsn_lookup) goto no_context; mmctx->ggsn_lookup->state = SGSN_GGSN_2DIGIT; mmctx->ggsn_lookup->mmctx = mmctx; strcpy(mmctx->ggsn_lookup->apn_str, apn_str); mmctx->ggsn_lookup->orig_msg = msg; mmctx->ggsn_lookup->tp = tp; mmctx->ggsn_lookup->ti = transaction_id; mmctx->ggsn_lookup->nsapi = act_req->req_nsapi; mmctx->ggsn_lookup->sapi = act_req->req_llc_sapi; hostname = osmo_apn_qualify_from_imsi(mmctx->imsi, mmctx->ggsn_lookup->apn_str, 0); LOGMMCTXP(LOGL_DEBUG, mmctx, "Going to query %s\n", hostname); rc = sgsn_ares_query(sgsn, hostname, ggsn_lookup_cb, mmctx->ggsn_lookup); if (rc != 0) { LOGMMCTXP(LOGL_ERROR, mmctx, "Failed to start ares query.\n"); goto no_context; } return 0; no_context: LOGMMCTXP(LOGL_ERROR, mmctx, "No GGSN context found!\n"); return gsm48_tx_gsm_act_pdp_rej(mmctx, transaction_id, gsm_cause, 0, NULL); } /* Section 9.5.1: Activate PDP Context Request */ static int gsm48_rx_gsm_act_pdp_req(struct sgsn_mm_ctx *mmctx, struct msgb *_msg) { struct msgb *msg; int rc; /* * This is painful. We might not have a static GGSN * configuration and then would need to copy the msg * and re-do most of this routine (or call it again * and make sure it only goes through the dynamic * resolving. The question is what to optimize for * and the dynamic resolution will be the right thing * in the long run. */ msg = gprs_msgb_copy(_msg, __func__); if (!msg) { struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(_msg); uint8_t transaction_id = gsm48_hdr_trans_id(gh); LOGMMCTXP(LOGL_ERROR, mmctx, "-> ACTIVATE PDP CONTEXT REQ failed copy.\n"); /* Send reject with GSM_CAUSE_INV_MAND_INFO */ return gsm48_tx_gsm_act_pdp_rej(mmctx, transaction_id, GSM_CAUSE_NET_FAIL, 0, NULL); } rc = do_act_pdp_req(mmctx, _msg); msgb_free(msg); return rc; } /* Section 9.5.8: Deactivate PDP Context Request */ static int gsm48_rx_gsm_deact_pdp_req(struct sgsn_mm_ctx *mm, struct msgb *msg) { struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); uint8_t transaction_id = gsm48_hdr_trans_id(gh); struct sgsn_pdp_ctx *pdp; LOGMMCTXP(LOGL_INFO, mm, "-> DEACTIVATE PDP CONTEXT REQ (cause: %s)\n", get_value_string(gsm48_gsm_cause_names, gh->data[0])); pdp = sgsn_pdp_ctx_by_tid(mm, transaction_id); if (!pdp) { LOGMMCTXP(LOGL_NOTICE, mm, "Deactivate PDP Context Request for " "non-existing PDP Context (IMSI=%s, TI=%u)\n", mm->imsi, transaction_id); return _gsm48_tx_gsm_deact_pdp_acc(mm, transaction_id); } return sgsn_delete_pdp_ctx(pdp); } /* Section 9.5.9: Deactivate PDP Context Accept */ static int gsm48_rx_gsm_deact_pdp_ack(struct sgsn_mm_ctx *mm, struct msgb *msg) { struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); uint8_t transaction_id = gsm48_hdr_trans_id(gh); struct sgsn_pdp_ctx *pdp; LOGMMCTXP(LOGL_INFO, mm, "-> DEACTIVATE PDP CONTEXT ACK\n"); pdp = sgsn_pdp_ctx_by_tid(mm, transaction_id); if (!pdp) { LOGMMCTXP(LOGL_NOTICE, mm, "Deactivate PDP Context Accept for " "non-existing PDP Context (IMSI=%s, TI=%u)\n", mm->imsi, transaction_id); return 0; } return sgsn_delete_pdp_ctx(pdp); } static int gsm48_rx_gsm_status(struct sgsn_mm_ctx *ctx, struct msgb *msg) { struct gsm48_hdr *gh = msgb_l3(msg); LOGMMCTXP(LOGL_INFO, ctx, "-> GPRS SM STATUS (cause: %s)\n", get_value_string(gsm48_gsm_cause_names, gh->data[0])); return 0; } static void pdpctx_timer_cb(void *_pdp) { struct sgsn_pdp_ctx *pdp = _pdp; pdp->num_T_exp++; switch (pdp->T) { case 3395: /* waiting for PDP CTX DEACT ACK */ if (pdp->num_T_exp >= 4) { LOGPDPCTXP(LOGL_NOTICE, pdp, "T3395 expired >= 5 times\n"); pdp->state = PDP_STATE_INACTIVE; sgsn_delete_pdp_ctx(pdp); break; } gsm48_tx_gsm_deact_pdp_req(pdp, GSM_CAUSE_NET_FAIL); osmo_timer_schedule(&pdp->timer, sgsn->cfg.timers.T3395, 0); break; default: LOGPDPCTXP(LOGL_ERROR, pdp, "timer expired in unknown mode %u\n", pdp->T); } } /* GPRS Session Management */ static int gsm0408_rcv_gsm(struct sgsn_mm_ctx *mmctx, struct msgb *msg, struct gprs_llc_llme *llme) { struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); int rc; /* MMCTX can be NULL when called */ if (!mmctx) { LOGP(DMM, LOGL_NOTICE, "Cannot handle SM for unknown MM CTX\n"); /* 6.1.3.6 */ if (gh->msg_type == GSM48_MT_GSM_STATUS) return 0; return sgsn_force_reattach_oldmsg(msg); } switch (gh->msg_type) { case GSM48_MT_GSM_ACT_PDP_REQ: rc = gsm48_rx_gsm_act_pdp_req(mmctx, msg); break; case GSM48_MT_GSM_DEACT_PDP_REQ: rc = gsm48_rx_gsm_deact_pdp_req(mmctx, msg); break; case GSM48_MT_GSM_DEACT_PDP_ACK: rc = gsm48_rx_gsm_deact_pdp_ack(mmctx, msg); break; case GSM48_MT_GSM_STATUS: rc = gsm48_rx_gsm_status(mmctx, msg); break; case GSM48_MT_GSM_REQ_PDP_ACT_REJ: case GSM48_MT_GSM_ACT_AA_PDP_REQ: case GSM48_MT_GSM_DEACT_AA_PDP_REQ: LOGMMCTXP(LOGL_NOTICE, mmctx, "Unimplemented GSM 04.08 GSM msg type 0x%02x: %s\n", gh->msg_type, osmo_hexdump((uint8_t *)gh, msgb_l3len(msg))); rc = gsm48_tx_sm_status(mmctx, GSM_CAUSE_MSGT_NOTEXIST_NOTIMPL); break; default: LOGMMCTXP(LOGL_NOTICE, mmctx, "Unknown GSM 04.08 GSM msg type 0x%02x: %s\n", gh->msg_type, osmo_hexdump((uint8_t *)gh, msgb_l3len(msg))); rc = gsm48_tx_sm_status(mmctx, GSM_CAUSE_MSGT_NOTEXIST_NOTIMPL); break; } return rc; } int gsm0408_gprs_force_reattach_oldmsg(struct msgb *msg) { int rc; gprs_llgmm_reset_oldmsg(msg, GPRS_SAPI_GMM); rc = gsm48_tx_gmm_detach_req_oldmsg( msg, GPRS_DET_T_MT_REATT_REQ, GMM_CAUSE_IMPL_DETACHED); return rc; } int gsm0408_gprs_force_reattach(struct sgsn_mm_ctx *mmctx) { int rc; if (mmctx->ran_type == MM_CTX_T_GERAN_Gb) gprs_llgmm_reset(mmctx->gb.llme); rc = gsm48_tx_gmm_detach_req( mmctx, GPRS_DET_T_MT_REATT_REQ, GMM_CAUSE_IMPL_DETACHED); mm_ctx_cleanup_free(mmctx, "forced reattach"); return rc; } /* Main entry point for incoming 04.08 GPRS messages from Iu */ int gsm0408_gprs_rcvmsg_iu(struct msgb *msg, struct gprs_ra_id *ra_id, uint16_t *sai) { struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); uint8_t pdisc = gsm48_hdr_pdisc(gh); struct sgsn_mm_ctx *mmctx; int rc = -EINVAL; DEBUGP(DMM, "grps_rcvmsg_iu(%s)\n", osmo_hexdump(msgb_gmmh(msg), msgb_l3len(msg))); mmctx = sgsn_mm_ctx_by_ue_ctx(msg->dst); if (mmctx) { rate_ctr_inc(&mmctx->ctrg->ctr[GMM_CTR_PKTS_SIG_IN]); if (ra_id) memcpy(&mmctx->ra, ra_id, sizeof(mmctx->ra)); //if (sai) //mmctx->iu.sai = *sai; } /* MMCTX can be NULL */ switch (pdisc) { case GSM48_PDISC_MM_GPRS: rc = gsm0408_rcv_gmm(mmctx, msg, NULL); break; case GSM48_PDISC_SM_GPRS: rc = gsm0408_rcv_gsm(mmctx, msg, NULL); break; default: LOGMMCTXP(LOGL_NOTICE, mmctx, "Unknown GSM 04.08 discriminator 0x%02x: %s\n", pdisc, osmo_hexdump((uint8_t *)gh, msgb_l3len(msg))); /* FIXME: return status message */ break; } /* MMCTX can be invalid */ return rc; } /* Main entry point for incoming 04.08 GPRS messages from Gb */ int gsm0408_gprs_rcvmsg_gb(struct msgb *msg, struct gprs_llc_llme *llme) { struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); uint8_t pdisc = gsm48_hdr_pdisc(gh); struct sgsn_mm_ctx *mmctx; struct gprs_ra_id ra_id; int rc = -EINVAL; bssgp_parse_cell_id(&ra_id, msgb_bcid(msg)); mmctx = sgsn_mm_ctx_by_tlli(msgb_tlli(msg), &ra_id); if (mmctx) { msgid2mmctx(mmctx, msg); rate_ctr_inc(&mmctx->ctrg->ctr[GMM_CTR_PKTS_SIG_IN]); mmctx->gb.llme = llme; } /* MMCTX can be NULL */ switch (pdisc) { case GSM48_PDISC_MM_GPRS: rc = gsm0408_rcv_gmm(mmctx, msg, llme); break; case GSM48_PDISC_SM_GPRS: rc = gsm0408_rcv_gsm(mmctx, msg, llme); break; default: LOGMMCTXP(LOGL_NOTICE, mmctx, "Unknown GSM 04.08 discriminator 0x%02x: %s\n", pdisc, osmo_hexdump((uint8_t *)gh, msgb_l3len(msg))); /* FIXME: return status message */ break; } /* MMCTX can be invalid */ return rc; } int gprs_gmm_rx_suspend(struct gprs_ra_id *raid, uint32_t tlli) { struct sgsn_mm_ctx *mmctx; mmctx = sgsn_mm_ctx_by_tlli(tlli, raid); if (!mmctx) { LOGP(DMM, LOGL_NOTICE, "SUSPEND request for unknown " "TLLI=%08x\n", tlli); return -EINVAL; } if (mmctx->mm_state != GMM_REGISTERED_NORMAL && mmctx->mm_state != GMM_REGISTERED_SUSPENDED) { LOGMMCTXP(LOGL_NOTICE, mmctx, "SUSPEND request while state " "!= REGISTERED (TLLI=%08x)\n", tlli); return -EINVAL; } /* Transition from REGISTERED_NORMAL to REGISTERED_SUSPENDED */ mmctx->mm_state = GMM_REGISTERED_SUSPENDED; return 0; } int gprs_gmm_rx_resume(struct gprs_ra_id *raid, uint32_t tlli, uint8_t suspend_ref) { struct sgsn_mm_ctx *mmctx; /* FIXME: make use of suspend reference? */ mmctx = sgsn_mm_ctx_by_tlli(tlli, raid); if (!mmctx) { LOGP(DMM, LOGL_NOTICE, "RESUME request for unknown " "TLLI=%08x\n", tlli); return -EINVAL; } if (mmctx->mm_state != GMM_REGISTERED_NORMAL && mmctx->mm_state != GMM_REGISTERED_SUSPENDED) { LOGMMCTXP(LOGL_NOTICE, mmctx, "RESUME request while state " "!= SUSPENDED (TLLI=%08x)\n", tlli); /* FIXME: should we not simply ignore it? */ return -EINVAL; } /* Transition from SUSPENDED to NORMAL */ mmctx->mm_state = GMM_REGISTERED_NORMAL; return 0; }