| /* 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) 2009-2010 by Harald Welte <laforge@gnumonks.org> |
| * (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 <http://www.gnu.org/licenses/>. |
| * |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <stdint.h> |
| #include <errno.h> |
| |
| #include <netinet/in.h> |
| #include <arpa/inet.h> |
| |
| #include <openbsc/db.h> |
| #include <osmocom/core/msgb.h> |
| #include <osmocom/gsm/tlv.h> |
| #include <osmocom/gsm/gsm_utils.h> |
| #include <osmocom/core/signal.h> |
| #include <osmocom/core/talloc.h> |
| #include <osmocom/core/rate_ctr.h> |
| |
| #include <osmocom/gprs/gprs_bssgp.h> |
| |
| #include <openbsc/debug.h> |
| #include <openbsc/gsm_data.h> |
| #include <openbsc/gsm_subscriber.h> |
| #include <openbsc/gsm_04_08.h> |
| #include <openbsc/gsm_04_08_gprs.h> |
| #include <openbsc/paging.h> |
| #include <openbsc/transaction.h> |
| #include <openbsc/gprs_llc.h> |
| #include <openbsc/gprs_sgsn.h> |
| #include <openbsc/gprs_gmm.h> |
| #include <openbsc/sgsn.h> |
| |
| #include <pdp.h> |
| |
| #define PTMSI_ALLOC |
| |
| /* Section 11.2.2 / Table 11.4 MM timers netwokr side */ |
| #define GSM0408_T3322_SECS 6 /* DETACH_REQ -> DETACH_ACC */ |
| #define GSM0408_T3350_SECS 6 /* waiting for ATT/RAU/TMSI COMPL */ |
| #define GSM0408_T3360_SECS 6 /* waiting for AUTH/CIPH RESP */ |
| #define GSM0408_T3370_SECS 6 /* waiting for ID RESP */ |
| |
| /* Section 11.2.2 / Table 11.4a MM timers netwokr side */ |
| #define GSM0408_T3313_SECS 30 /* waiting for paging response */ |
| #define GSM0408_T3314_SECS 44 /* force to STBY on expiry */ |
| #define GSM0408_T3316_SECS 44 |
| |
| /* Section 11.3 / Table 11.2d Timers of Session Management - network side */ |
| #define GSM0408_T3385_SECS 8 /* wait for ACT PDP CTX REQ */ |
| #define GSM0408_T3386_SECS 8 /* wait for MODIFY PDP CTX ACK */ |
| #define GSM0408_T3395_SECS 8 /* wait for DEACT PDP CTX ACK */ |
| #define GSM0408_T3397_SECS 8 /* wait for DEACT AA PDP CTX ACK */ |
| |
| extern struct sgsn_instance *sgsn; |
| |
| /* Protocol related stuff, should go into libosmocore */ |
| |
| /* 10.5.5.14 GPRS MM Cause / Table 10.5.147 */ |
| const struct value_string gmm_cause_names[] = { |
| { GMM_CAUSE_IMSI_UNKNOWN, "IMSI unknown in HLR" }, |
| { GMM_CAUSE_ILLEGAL_MS, "Illegal MS" }, |
| { GMM_CAUSE_ILLEGAL_ME, "Illegal ME" }, |
| { GMM_CAUSE_GPRS_NOTALLOWED, "GPRS services not allowed" }, |
| { GMM_CAUSE_GPRS_OTHER_NOTALLOWED, |
| "GPRS services and non-GPRS services not allowed" }, |
| { GMM_CAUSE_MS_ID_NOT_DERIVED, |
| "MS identity cannot be derived by the network" }, |
| { GMM_CAUSE_IMPL_DETACHED, "Implicitly detached" }, |
| { GMM_CAUSE_PLMN_NOTALLOWED, "PLMN not allowed" }, |
| { GMM_CAUSE_LA_NOTALLOWED, "Location Area not allowed" }, |
| { GMM_CAUSE_ROAMING_NOTALLOWED, |
| "Roaming not allowed in this location area" }, |
| { GMM_CAUSE_NO_GPRS_PLMN, |
| "GPRS services not allowed in this PLMN" }, |
| { GMM_CAUSE_MSC_TEMP_NOTREACH, "MSC temporarily not reachable" }, |
| { GMM_CAUSE_NET_FAIL, "Network failure" }, |
| { GMM_CAUSE_CONGESTION, "Congestion" }, |
| { GMM_CAUSE_SEM_INCORR_MSG, "Semantically incorrect message" }, |
| { GMM_CAUSE_INV_MAND_INFO, "Invalid mandatory information" }, |
| { GMM_CAUSE_MSGT_NOTEXIST_NOTIMPL, |
| "Message type non-existant or not implemented" }, |
| { GMM_CAUSE_MSGT_INCOMP_P_STATE, |
| "Message type not compatible with protocol state" }, |
| { GMM_CAUSE_IE_NOTEXIST_NOTIMPL, |
| "Information element non-existent or not implemented" }, |
| { GMM_CAUSE_COND_IE_ERR, "Conditional IE error" }, |
| { GMM_CAUSE_MSG_INCOMP_P_STATE, |
| "Message not compatible with protocol state " }, |
| { GMM_CAUSE_PROTO_ERR_UNSPEC, "Protocol error, unspecified" }, |
| { 0, NULL } |
| }; |
| |
| /* 10.5.6.6 SM Cause / Table 10.5.157 */ |
| const struct value_string gsm_cause_names[] = { |
| { GSM_CAUSE_INSUFF_RSRC, "Insufficient resources" }, |
| { GSM_CAUSE_MISSING_APN, "Missing or unknown APN" }, |
| { GSM_CAUSE_UNKNOWN_PDP, "Unknown PDP address or PDP type" }, |
| { GSM_CAUSE_AUTH_FAILED, "User Authentication failed" }, |
| { GSM_CAUSE_ACT_REJ_GGSN, "Activation rejected by GGSN" }, |
| { GSM_CAUSE_ACT_REJ_UNSPEC, "Activation rejected, unspecified" }, |
| { GSM_CAUSE_SERV_OPT_NOTSUPP, "Service option not supported" }, |
| { GSM_CAUSE_REQ_SERV_OPT_NOTSUB, |
| "Requested service option not subscribed" }, |
| { GSM_CAUSE_SERV_OPT_TEMP_OOO, |
| "Service option temporarily out of order" }, |
| { GSM_CAUSE_NSAPI_IN_USE, "NSAPI already used" }, |
| { GSM_CAUSE_DEACT_REGULAR, "Regular deactivation" }, |
| { GSM_CAUSE_QOS_NOT_ACCEPTED, "QoS not accepted" }, |
| { GSM_CAUSE_NET_FAIL, "Network Failure" }, |
| { GSM_CAUSE_REACT_RQD, "Reactivation required" }, |
| { GSM_CAUSE_FEATURE_NOTSUPP, "Feature not supported " }, |
| { GSM_CAUSE_INVALID_TRANS_ID, "Invalid transaction identifier" }, |
| { GSM_CAUSE_SEM_INCORR_MSG, "Semantically incorrect message" }, |
| { GSM_CAUSE_INV_MAND_INFO, "Invalid mandatory information" }, |
| { GSM_CAUSE_MSGT_NOTEXIST_NOTIMPL, |
| "Message type non-existant or not implemented" }, |
| { GSM_CAUSE_MSGT_INCOMP_P_STATE, |
| "Message type not compatible with protocol state" }, |
| { GSM_CAUSE_IE_NOTEXIST_NOTIMPL, |
| "Information element non-existent or not implemented" }, |
| { GSM_CAUSE_COND_IE_ERR, "Conditional IE error" }, |
| { GSM_CAUSE_MSG_INCOMP_P_STATE, |
| "Message not compatible with protocol state " }, |
| { GSM_CAUSE_PROTO_ERR_UNSPEC, "Protocol error, unspecified" }, |
| { 0, NULL } |
| }; |
| |
| /* 10.5.5.2 */ |
| const struct value_string gprs_att_t_strs[] = { |
| { GPRS_ATT_T_ATTACH, "GPRS attach" }, |
| { GPRS_ATT_T_ATT_WHILE_IMSI, "GPRS attach while IMSI attached" }, |
| { GPRS_ATT_T_COMBINED, "Combined GPRS/IMSI attach" }, |
| { 0, NULL } |
| }; |
| |
| const struct value_string gprs_upd_t_strs[] = { |
| { GPRS_UPD_T_RA, "RA updating" }, |
| { GPRS_UPD_T_RA_LA, "combined RA/LA updating" }, |
| { GPRS_UPD_T_RA_LA_IMSI_ATT, "combined RA/LA updating + IMSI attach" }, |
| { GPRS_UPD_T_PERIODIC, "periodic updating" }, |
| { 0, NULL } |
| }; |
| |
| /* 10.5.5.5 */ |
| const struct value_string gprs_det_t_mo_strs[] = { |
| { GPRS_DET_T_MO_GPRS, "GPRS detach" }, |
| { GPRS_DET_T_MO_IMSI, "IMSI detach" }, |
| { GPRS_DET_T_MO_COMBINED, "Combined GPRS/IMSI detach" }, |
| { 0, NULL } |
| }; |
| |
| 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 }, |
| }, |
| }; |
| |
| /* 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)) |
| LOGP(DMM, LOGL_ERROR, "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) |
| LOGP(DMM, LOGL_ERROR, "Stopping MM timer %u but " |
| "%u is running\n", T, mm->T); |
| osmo_timer_del(&mm->timer); |
| } |
| |
| /* 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]); |
| |
| /* 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); |
| } |
| |
| /* Store BVCI/NSEI in MM context */ |
| static void msgid2mmctx(struct sgsn_mm_ctx *mm, const struct msgb *msg) |
| { |
| mm->bvci = msgb_bvci(msg); |
| mm->nsei = msgb_nsei(msg); |
| } |
| |
| /* Store BVCI/NSEI in MM context */ |
| static void mmctx2msgid(struct msgb *msg, const struct sgsn_mm_ctx *mm) |
| { |
| msgb_tlli(msg) = mm->tlli; |
| msgb_bvci(msg) = mm->bvci; |
| msgb_nsei(msg) = mm->nsei; |
| } |
| |
| /* 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(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(); |
| |
| mmctx2msgid(msg, mmctx); |
| return _tx_status(msg, cause, mmctx, 0); |
| }; |
| static int gsm48_tx_gmm_status_oldmsg(struct msgb *oldmsg, uint8_t cause) |
| { |
| struct msgb *msg = gsm48_msgb_alloc(); |
| |
| gmm_copy_id(msg, oldmsg); |
| return _tx_status(msg, cause, NULL, 0); |
| } |
| static int gsm48_tx_sm_status(struct sgsn_mm_ctx *mmctx, uint8_t cause) |
| { |
| struct msgb *msg = gsm48_msgb_alloc(); |
| |
| mmctx2msgid(msg, mmctx); |
| return _tx_status(msg, cause, mmctx, 1); |
| }; |
| static int gsm48_tx_sm_status_oldmsg(struct msgb *oldmsg, uint8_t cause) |
| { |
| struct msgb *msg = gsm48_msgb_alloc(); |
| |
| gmm_copy_id(msg, oldmsg); |
| return _tx_status(msg, cause, NULL, 1); |
| } |
| |
| |
| 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(); |
| struct gsm48_hdr *gh; |
| struct gsm48_attach_ack *aa; |
| uint8_t *ptsig, *mid; |
| |
| DEBUGP(DMM, "<- 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_TMR_MINUTE | 10; |
| 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; |
| |
| /* Optional: Negotiated Ready timer value */ |
| #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: 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) |
| { |
| struct gsm48_hdr *gh; |
| |
| DEBUGP(DMM, "<- GPRS ATTACH REJECT\n"); |
| |
| 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(); |
| gmm_copy_id(msg, old_msg); |
| return _tx_gmm_att_rej(msg, gmm_cause); |
| } |
| static int gsm48_tx_gmm_att_rej(struct sgsn_mm_ctx *mm, |
| uint8_t gmm_cause) |
| { |
| struct msgb *msg = gsm48_msgb_alloc(); |
| mmctx2msgid(msg, mm); |
| return _tx_gmm_att_rej(msg, gmm_cause); |
| } |
| |
| /* Chapter 9.4.6.2 Detach accept */ |
| static int gsm48_tx_gmm_det_ack(struct sgsn_mm_ctx *mm, uint8_t force_stby) |
| { |
| struct msgb *msg = gsm48_msgb_alloc(); |
| struct gsm48_hdr *gh; |
| |
| DEBUGP(DMM, "<- GPRS DETACH ACCEPT\n"); |
| |
| 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_DETACH_ACK; |
| gh->data[0] = force_stby; |
| |
| return gsm48_gmm_sendmsg(msg, 0, mm); |
| } |
| |
| /* 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(); |
| struct gsm48_hdr *gh; |
| |
| DEBUGP(DMM, "<- GPRS IDENTITY REQUEST: mi_type=%02x\n", 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(); |
| struct gsm48_hdr *gh; |
| struct gsm48_auth_ciph_req *acreq; |
| uint8_t *m_rand, *m_cksn; |
| |
| DEBUGP(DMM, "<- 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+1); |
| m_cksn[0] = GSM48_IE_GMM_CIPH_CKSN; |
| m_cksn[1] = key_seq; |
| } |
| |
| /* Start T3360 */ |
| mmctx_timer_start(mm, 3360, GSM0408_T3360_SECS); |
| |
| /* 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(); |
| struct gsm48_hdr *gh; |
| |
| DEBUGP(DMM, "<- 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; |
| int rc; |
| |
| /* FIXME: Stop T3360 */ |
| |
| rc = 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)) { |
| /* FIXME: missing mandatory IE */ |
| } |
| |
| /* FIXME: compare SRES with what we expected */ |
| /* FIXME: enable LLC cipheirng */ |
| return 0; |
| } |
| |
| /* Check if we can already authorize a subscriber */ |
| static int gsm48_gmm_authorize(struct sgsn_mm_ctx *ctx, |
| enum gprs_t3350_mode t3350_mode) |
| { |
| if (strlen(ctx->imei) && strlen(ctx->imsi)) { |
| #ifdef PTMSI_ALLOC |
| /* Start T3350 and re-transmit up to 5 times until ATTACH COMPLETE */ |
| ctx->t3350_mode = t3350_mode; |
| mmctx_timer_start(ctx, 3350, GSM0408_T3350_SECS); |
| #endif |
| ctx->mm_state = GMM_REGISTERED_NORMAL; |
| return gsm48_tx_gmm_att_ack(ctx); |
| } |
| if (!strlen(ctx->imei)) { |
| ctx->mm_state = GMM_COMMON_PROC_INIT; |
| ctx->t3370_id_type = GSM_MI_TYPE_IMEI; |
| mmctx_timer_start(ctx, 3370, GSM0408_T3370_SECS); |
| return gsm48_tx_gmm_id_req(ctx, GSM_MI_TYPE_IMEI); |
| } |
| |
| if (!strlen(ctx->imsi)) { |
| ctx->mm_state = GMM_COMMON_PROC_INIT; |
| ctx->t3370_id_type = GSM_MI_TYPE_IMSI; |
| mmctx_timer_start(ctx, 3370, GSM0408_T3370_SECS); |
| return gsm48_tx_gmm_id_req(ctx, GSM_MI_TYPE_IMSI); |
| } |
| |
| return 0; |
| } |
| |
| /* 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]); |
| DEBUGP(DMM, "-> GMM IDENTITY RESPONSE: mi_type=0x%02x MI(%s) ", |
| mi_type, mi_string); |
| |
| if (!ctx) { |
| DEBUGP(DMM, "from unknown TLLI 0x%08x?!?\n", msgb_tlli(msg)); |
| 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) { |
| DEBUGP(DMM, "Deleting old MM Context for same IMSI " |
| "p_tmsi_old=0x%08x, p_tmsi_new=0x%08x\n", |
| ictx->p_tmsi, ctx->p_tmsi); |
| gprs_llgmm_assign(ictx->llme, ictx->tlli, |
| 0xffffffff, GPRS_ALGO_GEA0, NULL); |
| /* FIXME: this is a hard free, we don't |
| * clean-up any PDP contexts on the |
| * libgtp side */ |
| sgsn_mm_ctx_free(ictx); |
| } |
| } |
| strncpy(ctx->imsi, mi_string, sizeof(ctx->imei)); |
| break; |
| case GSM_MI_TYPE_IMEI: |
| strncpy(ctx->imei, mi_string, sizeof(ctx->imei)); |
| break; |
| case GSM_MI_TYPE_IMEISV: |
| break; |
| } |
| |
| DEBUGPC(DMM, "\n"); |
| /* Check if we can let the mobile station enter */ |
| return gsm48_gmm_authorize(ctx, ctx->t3350_mode); |
| } |
| |
| /* 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, *old_ra_info, *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; |
| |
| DEBUGP(DMM, "-> 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. */ |
| |
| 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; |
| |
| /* aTTACH Type 10.5.5.2 */ |
| att_type = *cur++ & 0x0f; |
| |
| /* 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 */ |
| old_ra_info = cur; |
| 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; |
| |
| /* 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 |
| /* As a temorary hack, we simply assume that the IMSI exists, |
| * as long as it is part of 'our' network */ |
| char mccmnc[16]; |
| snprintf(mccmnc, sizeof(mccmnc), "%03d%02d", ra_id.mcc, ra_id.mnc); |
| if (strncmp(mccmnc, mi_string, 5) && |
| (sgsn->cfg.acl_enabled && |
| !sgsn_acl_lookup(mi_string))) { |
| LOGP(DMM, LOGL_INFO, "Rejecting ATTACH REQUESET IMSI=%s\n", |
| mi_string); |
| return gsm48_tx_gmm_att_rej_oldmsg(msg, |
| GMM_CAUSE_GPRS_NOTALLOWED); |
| } |
| ctx = sgsn_mm_ctx_alloc(0, &ra_id); |
| if (!ctx) |
| return gsm48_tx_gmm_att_rej_oldmsg(msg, GMM_CAUSE_NET_FAIL); |
| strncpy(ctx->imsi, mi_string, sizeof(ctx->imsi)); |
| #endif |
| } |
| ctx->tlli = msgb_tlli(msg); |
| ctx->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 */ |
| ctx = sgsn_mm_ctx_alloc(msgb_tlli(msg), &ra_id); |
| ctx->p_tmsi = tmsi; |
| } |
| ctx->tlli = msgb_tlli(msg); |
| ctx->llme = llme; |
| msgid2mmctx(ctx, msg); |
| break; |
| default: |
| LOGP(DMM, LOGL_NOTICE, "Rejecting ATTACH REQUEST with " |
| "MI type %u\n", mi_type); |
| return gsm48_tx_gmm_att_rej_oldmsg(msg, GMM_CAUSE_MS_ID_NOT_DERIVED); |
| } |
| /* Update MM Context with currient RA and Cell ID */ |
| ctx->ra = ra_id; |
| ctx->cell_id = cid; |
| /* 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 */ |
| ctx->p_tmsi_old = ctx->p_tmsi; |
| ctx->p_tmsi = sgsn_alloc_ptmsi(); |
| #endif |
| /* Even if there is no P-TMSI allocated, the MS will switch from |
| * foreign TLLI to local TLLI */ |
| ctx->tlli_new = gprs_tmsi2tlli(ctx->p_tmsi, TLLI_LOCAL); |
| |
| /* Inform LLC layer about new TLLI but keep old active */ |
| gprs_llgmm_assign(ctx->llme, ctx->tlli, ctx->tlli_new, |
| GPRS_ALGO_GEA0, NULL); |
| |
| DEBUGPC(DMM, "\n"); |
| return gsm48_gmm_authorize(ctx, GMM_T3350_MODE_ATT); |
| |
| err_inval: |
| DEBUGPC(DMM, "\n"); |
| return gsm48_tx_gmm_att_rej_oldmsg(msg, GMM_CAUSE_SEM_INCORR_MSG); |
| } |
| |
| /* 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); |
| struct sgsn_pdp_ctx *pdp, *pdp2; |
| uint8_t detach_type, power_off; |
| int rc; |
| |
| 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 */ |
| |
| DEBUGP(DMM, "-> 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" : ""); |
| |
| /* Mark MM state as deregistered */ |
| ctx->mm_state = GMM_DEREGISTERED; |
| |
| /* delete all existing PDP contexts for this MS */ |
| llist_for_each_entry_safe(pdp, pdp2, &ctx->pdp_list, list) { |
| LOGP(DMM, LOGL_NOTICE, "Dropping PDP context for NSAPI=%u " |
| "due to GPRS DETACH REQUEST\n", pdp->nsapi); |
| sgsn_delete_pdp_ctx(pdp); |
| /* FIXME: the callback wants to transmit a DEACT PDP CTX ACK, |
| * which is quite stupid for a MS that has just detached.. */ |
| } |
| |
| /* force_stby = 0 */ |
| rc = gsm48_tx_gmm_det_ack(ctx, 0); |
| |
| /* TLLI unassignment */ |
| gprs_llgmm_assign(ctx->llme, ctx->tlli, 0xffffffff, |
| GPRS_ALGO_GEA0, NULL); |
| |
| 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(); |
| struct gsm48_hdr *gh; |
| struct gsm48_ra_upd_ack *rua; |
| uint8_t *mid; |
| |
| DEBUGP(DMM, "<- 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_TMR_MINUTE | 10; |
| |
| 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 |
| |
| /* 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(); |
| struct gsm48_hdr *gh; |
| |
| DEBUGP(DMM, "<- 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))) { |
| LOGP(DMM, LOGL_NOTICE, "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)))) { |
| LOGP(DMM, LOGL_NOTICE, "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) |
| { |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); |
| uint8_t *cur = gh->data; |
| uint8_t *ms_ra_acc_cap; |
| uint8_t ms_ra_acc_cap_len; |
| struct gprs_ra_id old_ra_id; |
| struct tlv_parsed tp; |
| uint8_t upd_type; |
| int rc; |
| |
| /* Update Type 10.5.5.18 */ |
| upd_type = *cur++ & 0x0f; |
| |
| DEBUGP(DMM, "-> GMM RA UPDATE REQUEST type=\"%s\" ", |
| 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++; |
| ms_ra_acc_cap = cur; |
| if (ms_ra_acc_cap_len > 52) |
| return gsm48_tx_gmm_ra_upd_rej(msg, GMM_CAUSE_PROTO_ERR_UNSPEC); |
| cur += ms_ra_acc_cap_len; |
| |
| /* Optional: Old P-TMSI Signature, Requested READY timer, TMSI Status, |
| * DRX parameter, MS network capability */ |
| rc = 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: |
| DEBUGPC(DMM, " unsupported in Mode III, is your SI13 corrupt?\n"); |
| return gsm48_tx_gmm_ra_upd_rej(msg, GMM_CAUSE_PROTO_ERR_UNSPEC); |
| break; |
| case GPRS_UPD_T_RA: |
| case GPRS_UPD_T_PERIODIC: |
| break; |
| } |
| |
| /* Look-up the MM context based on old RA-ID and TLLI */ |
| mmctx = sgsn_mm_ctx_by_tlli(msgb_tlli(msg), &old_ra_id); |
| if (!mmctx || mmctx->mm_state == GMM_DEREGISTERED) { |
| /* send a XID reset to re-set all LLC sequence numbers |
| * in the MS */ |
| DEBUGPC(DMM, " LLC XID RESET "); |
| gprs_llgmm_reset(llme); |
| /* The MS has to perform GPRS attach */ |
| DEBUGPC(DMM, " REJECT\n"); |
| /* Device is still IMSI atached for CS but initiate GPRS ATTACH */ |
| return gsm48_tx_gmm_ra_upd_rej(msg, GMM_CAUSE_MS_ID_NOT_DERIVED); |
| } |
| |
| /* 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 */ |
| bssgp_parse_cell_id(&mmctx->ra, msgb_bcid(msg)); |
| /* Update the MM context with the new (i.e. foreign) TLLI */ |
| mmctx->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]); |
| |
| DEBUGPC(DMM, " ACCEPT\n"); |
| #ifdef PTMSI_ALLOC |
| 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, GSM0408_T3350_SECS); |
| #endif |
| /* Even if there is no P-TMSI allocated, the MS will switch from |
| * foreign TLLI to local TLLI */ |
| mmctx->tlli_new = gprs_tmsi2tlli(mmctx->p_tmsi, TLLI_LOCAL); |
| |
| /* Inform LLC layer about new TLLI but keep old active */ |
| gprs_llgmm_assign(mmctx->llme, mmctx->tlli, mmctx->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); |
| } |
| |
| /* Make sure we are NORMAL (i.e. not SUSPENDED anymore) */ |
| mmctx->mm_state = GMM_REGISTERED_NORMAL; |
| |
| /* Send RA UPDATE ACCEPT */ |
| return gsm48_tx_gmm_ra_upd_ack(mmctx); |
| } |
| |
| static int gsm48_rx_gmm_status(struct sgsn_mm_ctx *mmctx, struct msgb *msg) |
| { |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| |
| DEBUGP(DMM, "-> GPRS MM STATUS (cause: %s)\n", |
| get_value_string(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 gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); |
| int rc; |
| |
| /* MMCTX can be NULL when called */ |
| |
| if (!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"); |
| gprs_llgmm_reset(llme); |
| return gsm48_tx_gmm_status_oldmsg(msg, GMM_CAUSE_MS_ID_NOT_DERIVED); |
| } |
| |
| 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_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_ATTACH_COMPL: |
| /* only in case SGSN offered new P-TMSI */ |
| DEBUGP(DMM, "-> ATTACH COMPLETE\n"); |
| mmctx_timer_stop(mmctx, 3350); |
| mmctx->p_tmsi_old = 0; |
| /* Unassign the old TLLI */ |
| mmctx->tlli = mmctx->tlli_new; |
| gprs_llgmm_assign(mmctx->llme, 0xffffffff, mmctx->tlli_new, |
| GPRS_ALGO_GEA0, NULL); |
| rc = 0; |
| break; |
| case GSM48_MT_GMM_RA_UPD_COMPL: |
| /* only in case SGSN offered new P-TMSI */ |
| DEBUGP(DMM, "-> ROUTEING AREA UPDATE COMPLETE\n"); |
| mmctx_timer_stop(mmctx, 3350); |
| mmctx->p_tmsi_old = 0; |
| /* Unassign the old TLLI */ |
| mmctx->tlli = mmctx->tlli_new; |
| gprs_llgmm_assign(mmctx->llme, 0xffffffff, mmctx->tlli_new, |
| GPRS_ALGO_GEA0, NULL); |
| rc = 0; |
| break; |
| case GSM48_MT_GMM_PTMSI_REALL_COMPL: |
| DEBUGP(DMM, "-> PTMSI REALLLICATION COMPLETE\n"); |
| mmctx_timer_stop(mmctx, 3350); |
| mmctx->p_tmsi_old = 0; |
| /* Unassign the old TLLI */ |
| mmctx->tlli = mmctx->tlli_new; |
| //gprs_llgmm_assign(mmctx->llme, 0xffffffff, mmctx->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: |
| DEBUGP(DMM, "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; |
| |
| mm->num_T_exp++; |
| |
| switch (mm->T) { |
| case 3350: /* waiting for ATTACH COMPLETE */ |
| if (mm->num_T_exp >= 5) { |
| LOGP(DMM, LOGL_NOTICE, "T3350 expired >= 5 times\n"); |
| mm->mm_state = GMM_DEREGISTERED; |
| /* 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; |
| } |
| osmo_timer_schedule(&mm->timer, GSM0408_T3350_SECS, 0); |
| break; |
| case 3360: /* waiting for AUTH AND CIPH RESP */ |
| if (mm->num_T_exp >= 5) { |
| LOGP(DMM, LOGL_NOTICE, "T3360 expired >= 5 times\n"); |
| mm->mm_state = GMM_DEREGISTERED; |
| break; |
| } |
| /* FIXME: re-transmit the respective msg and re-start timer */ |
| osmo_timer_schedule(&mm->timer, GSM0408_T3360_SECS, 0); |
| break; |
| case 3370: /* waiting for IDENTITY RESPONSE */ |
| if (mm->num_T_exp >= 5) { |
| LOGP(DMM, LOGL_NOTICE, "T3370 expired >= 5 times\n"); |
| gsm48_tx_gmm_att_rej(mm, GMM_CAUSE_MS_ID_NOT_DERIVED); |
| mm->mm_state = GMM_DEREGISTERED; |
| break; |
| } |
| /* re-tranmit IDENTITY REQUEST and re-start timer */ |
| gsm48_tx_gmm_id_req(mm, mm->t3370_id_type); |
| osmo_timer_schedule(&mm->timer, GSM0408_T3370_SECS, 0); |
| break; |
| default: |
| LOGP(DMM, LOGL_ERROR, "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)) |
| LOGP(DMM, LOGL_ERROR, "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); |
| } |
| |
| |
| 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); |
| } |
| |
| /* 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(); |
| struct gsm48_hdr *gh; |
| uint8_t transaction_id = pdp->ti ^ 0x8; /* flip */ |
| |
| DEBUGP(DMM, "<- 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 && pdp->lib->pco_req.v) |
| 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(); |
| struct gsm48_hdr *gh; |
| uint8_t transaction_id = tid ^ 0x8; /* flip */ |
| |
| DEBUGP(DMM, "<- 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(); |
| struct gsm48_hdr *gh; |
| uint8_t transaction_id = tid ^ 0x8; /* flip */ |
| |
| DEBUGP(DMM, "<- 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, GSM0408_T3395_SECS); |
| |
| 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(); |
| struct gsm48_hdr *gh; |
| uint8_t transaction_id = tid ^ 0x8; /* flip */ |
| |
| DEBUGP(DMM, "<- 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); |
| } |
| |
| /* 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 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 = (gh->proto_discr >> 4); |
| struct sgsn_ggsn_ctx *ggsn; |
| struct sgsn_pdp_ctx *pdp; |
| |
| DEBUGP(DMM, "-> 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 */ |
| |
| /* 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)); |
| |
| 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; |
| } |
| |
| DEBUGPC(DMM, "\n"); |
| |
| /* 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; |
| |
| /* FIXME: determine GGSN based on APN and subscription options */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_GSM_APN)) {} |
| |
| /* 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); |
| } |
| |
| /* 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); |
| } |
| |
| /* Only increment counter for a real activation, after we checked |
| * for re-transmissions */ |
| rate_ctr_inc(&mmctx->ctrg->ctr[GMM_CTR_PDP_CTX_ACT]); |
| |
| ggsn = sgsn_ggsn_ctx_by_id(0); |
| if (!ggsn) { |
| LOGP(DGPRS, LOGL_ERROR, "No GGSN context 0 found!\n"); |
| return -EIO; |
| } |
| ggsn->gsn = sgsn->gsn; |
| pdp = sgsn_create_pdp_ctx(ggsn, mmctx, act_req->req_nsapi, &tp); |
| if (!pdp) |
| return -1; |
| |
| /* Store SAPI and Transaction Identifier */ |
| pdp->sapi = act_req->req_llc_sapi; |
| pdp->ti = transaction_id; |
| |
| return 0; |
| } |
| |
| /* 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 = (gh->proto_discr >> 4); |
| struct sgsn_pdp_ctx *pdp; |
| |
| DEBUGP(DMM, "-> DEACTIVATE PDP CONTEXT REQ (cause: %s)\n", |
| get_value_string(gsm_cause_names, gh->data[0])); |
| |
| pdp = sgsn_pdp_ctx_by_tid(mm, transaction_id); |
| if (!pdp) { |
| LOGP(DMM, LOGL_NOTICE, "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 = (gh->proto_discr >> 4); |
| struct sgsn_pdp_ctx *pdp; |
| |
| DEBUGP(DMM, "-> DEACTIVATE PDP CONTEXT ACK\n"); |
| |
| pdp = sgsn_pdp_ctx_by_tid(mm, transaction_id); |
| if (!pdp) { |
| LOGP(DMM, LOGL_NOTICE, "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); |
| |
| DEBUGP(DMM, "-> GPRS SM STATUS (cause: %s)\n", |
| get_value_string(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) { |
| LOGP(DMM, LOGL_NOTICE, "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, GSM0408_T3395_SECS, 0); |
| break; |
| default: |
| LOGP(DMM, LOGL_ERROR, "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"); |
| gsm48_tx_gmm_status_oldmsg(msg, GMM_CAUSE_IMPL_DETACHED); |
| return gsm48_tx_sm_status_oldmsg(msg, GSM_CAUSE_PROTO_ERR_UNSPEC); |
| } |
| |
| 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: |
| DEBUGP(DMM, "Unimplemented GSM 04.08 GSM msg type 0x%02x\n", |
| gh->msg_type); |
| rc = gsm48_tx_sm_status(mmctx, GSM_CAUSE_MSGT_NOTEXIST_NOTIMPL); |
| break; |
| default: |
| DEBUGP(DMM, "Unknown GSM 04.08 GSM msg type 0x%02x\n", |
| gh->msg_type); |
| rc = gsm48_tx_sm_status(mmctx, GSM_CAUSE_MSGT_NOTEXIST_NOTIMPL); |
| break; |
| |
| } |
| |
| return rc; |
| } |
| |
| /* Main entry point for incoming 04.08 GPRS messages */ |
| int gsm0408_gprs_rcvmsg(struct msgb *msg, struct gprs_llc_llme *llme) |
| { |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); |
| uint8_t pdisc = gh->proto_discr & 0x0f; |
| 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->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: |
| DEBUGP(DMM, "Unknown GSM 04.08 discriminator 0x%02x\n", |
| pdisc); |
| /* FIXME: return status message */ |
| break; |
| } |
| |
| 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) { |
| LOGP(DMM, LOGL_NOTICE, "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_SUSPENDED) { |
| LOGP(DMM, LOGL_NOTICE, "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; |
| } |