/* 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 * (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 #define PTMSI_ALLOC /* Section 11.2.2 / Table 11.4 MM timers netowkr 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 netowkr 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 (bsc_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; bsc_schedule_timer(&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); bsc_del_timer(&mm->timer); } /* Send a message through the underlying layer */ static int gsm48_gmm_sendmsg(struct msgb *msg, int command, const 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", 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); 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 > 8) 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 > 51) goto err_inval; /* 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 */ 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, ms_ra_acc_cap_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 ctx ? gsm48_gmm_authorize(ctx, GMM_T3350_MODE_ATT) : 0; 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, uint16_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_status & (1 << pdp->nsapi))) { LOGP(DMM, LOGL_NOTICE, "Dropping PDP context for NSAPI=%u " "due to PDP CTX STATUS IE= 0x%04x\n", pdp->nsapi, pdp_status); 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; /* 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) { /* 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)) { uint16_t pdp_status = ntohs(*(uint16_t *) TLVP_VAL(&tp, GSM48_IE_GMM_PDP_CTX_STATUS)); process_ms_ctx_status(mmctx, pdp_status); } /* 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"); 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); 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); 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); 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; } bsc_schedule_timer(&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 */ bsc_schedule_timer(&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); bsc_schedule_timer(&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 (bsc_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; bsc_schedule_timer(&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); bsc_schedule_timer(&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; }