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Diffstat (limited to 'src/gprs/gprs_gmm.c')
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1 files changed, 2939 insertions, 0 deletions
diff --git a/src/gprs/gprs_gmm.c b/src/gprs/gprs_gmm.c new file mode 100644 index 000000000..e6751db7c --- /dev/null +++ b/src/gprs/gprs_gmm.c @@ -0,0 +1,2939 @@ +/* GSM Mobile Radio Interface Layer 3 messages on the A-bis interface + * 3GPP TS 04.08 version 7.21.0 Release 1998 / ETSI TS 100 940 V7.21.0 */ + +/* (C) 2009-2015 by Harald Welte <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 <stdbool.h> +#include <netinet/in.h> +#include <arpa/inet.h> +#include <netdb.h> + +#include <openssl/rand.h> + +#include "bscconfig.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/core/utils.h> +#include <osmocom/crypt/auth.h> +#include <osmocom/gsm/apn.h> +#include <osmocom/gsm/protocol/gsm_04_08_gprs.h> + +#include <osmocom/gprs/gprs_bssgp.h> + +#ifdef BUILD_IU +#include <osmocom/ranap/ranap_ies_defs.h> +#include <osmocom/ranap/ranap_msg_factory.h> +#endif + +#include <openbsc/debug.h> +#include <openbsc/gsm_data.h> +#include <openbsc/gsm_subscriber.h> +#include <openbsc/gsm_04_08.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/gprs_utils.h> +#include <openbsc/gprs_subscriber.h> +#include <openbsc/sgsn.h> +#include <openbsc/signal.h> +#include <openbsc/iu.h> +#include <openbsc/gprs_sndcp.h> + +#include <pdp.h> + +#define PTMSI_ALLOC + +extern struct sgsn_instance *sgsn; + +static const struct tlv_definition gsm48_gmm_att_tlvdef = { + .def = { + [GSM48_IE_GMM_CIPH_CKSN] = { TLV_TYPE_FIXED, 1 }, + [GSM48_IE_GMM_TIMER_READY] = { TLV_TYPE_TV, 1 }, + [GSM48_IE_GMM_ALLOC_PTMSI] = { TLV_TYPE_TLV, 0 }, + [GSM48_IE_GMM_PTMSI_SIG] = { TLV_TYPE_FIXED, 3 }, + [GSM48_IE_GMM_AUTH_RAND] = { TLV_TYPE_FIXED, 16 }, + [GSM48_IE_GMM_AUTH_SRES] = { TLV_TYPE_FIXED, 4 }, + [GSM48_IE_GMM_AUTH_RES_EXT] = { TLV_TYPE_TLV, 0 }, + [GSM48_IE_GMM_AUTH_FAIL_PAR] = { TLV_TYPE_TLV, 0 }, + [GSM48_IE_GMM_IMEISV] = { TLV_TYPE_TLV, 0 }, + [GSM48_IE_GMM_DRX_PARAM] = { TLV_TYPE_FIXED, 2 }, + [GSM48_IE_GMM_MS_NET_CAPA] = { TLV_TYPE_TLV, 0 }, + [GSM48_IE_GMM_PDP_CTX_STATUS] = { TLV_TYPE_TLV, 0 }, + [GSM48_IE_GMM_PS_LCS_CAPA] = { TLV_TYPE_TLV, 0 }, + [GSM48_IE_GMM_GMM_MBMS_CTX_ST] = { TLV_TYPE_TLV, 0 }, + }, +}; + +static const struct tlv_definition gsm48_sm_att_tlvdef = { + .def = { + [GSM48_IE_GSM_APN] = { TLV_TYPE_TLV, 0 }, + [GSM48_IE_GSM_PROTO_CONF_OPT] = { TLV_TYPE_TLV, 0 }, + [GSM48_IE_GSM_PDP_ADDR] = { TLV_TYPE_TLV, 0 }, + [GSM48_IE_GSM_AA_TMR] = { TLV_TYPE_TV, 1 }, + [GSM48_IE_GSM_NAME_FULL] = { TLV_TYPE_TLV, 0 }, + [GSM48_IE_GSM_NAME_SHORT] = { TLV_TYPE_TLV, 0 }, + [GSM48_IE_GSM_TIMEZONE] = { TLV_TYPE_FIXED, 1 }, + [GSM48_IE_GSM_UTC_AND_TZ] = { TLV_TYPE_FIXED, 7 }, + [GSM48_IE_GSM_LSA_ID] = { TLV_TYPE_TLV, 0 }, + }, +}; + +static const struct value_string gprs_pmm_state_names[] = { + { PMM_DETACHED, "PMM DETACH" }, + { PMM_CONNECTED, "PMM CONNECTED" }, + { PMM_IDLE, "PMM IDLE" }, + { MM_IDLE, "MM IDLE" }, + { MM_READY, "MM READY" }, + { MM_STANDBY, "MM STANDBY" }, + { 0, NULL } +}; + +static int gsm48_gmm_authorize(struct sgsn_mm_ctx *ctx); + +static void mmctx_change_gtpu_endpoints_to_sgsn(struct sgsn_mm_ctx *mm_ctx) +{ + struct sgsn_pdp_ctx *pdp; + llist_for_each_entry(pdp, &mm_ctx->pdp_list, list) { + sgsn_pdp_upd_gtp_u(pdp, + &sgsn->cfg.gtp_listenaddr.sin_addr, + sizeof(sgsn->cfg.gtp_listenaddr.sin_addr)); + } +} + +void mmctx_set_pmm_state(struct sgsn_mm_ctx *ctx, enum gprs_pmm_state state) +{ + if (ctx->ran_type != MM_CTX_T_UTRAN_Iu) + return; + + if (ctx->pmm_state == state) + return; + + LOGMMCTXP(LOGL_INFO, ctx, "Changing PMM state from %s to %s\n", + get_value_string(gprs_pmm_state_names, ctx->pmm_state), + get_value_string(gprs_pmm_state_names, state)); + + switch (state) { + case PMM_IDLE: + /* TODO: start RA Upd timer */ + mmctx_change_gtpu_endpoints_to_sgsn(ctx); + break; + case PMM_CONNECTED: + break; + default: + break; + } + + ctx->pmm_state = state; +} + +void mmctx_set_mm_state(struct sgsn_mm_ctx *ctx, enum gprs_pmm_state state) +{ + if (ctx->ran_type != MM_CTX_T_GERAN_Gb) + return; + + if (ctx->pmm_state == state) + return; + + LOGMMCTXP(LOGL_INFO, ctx, "Changing MM state from %s to %s\n", + get_value_string(gprs_pmm_state_names, ctx->pmm_state), + get_value_string(gprs_pmm_state_names, state)); + + ctx->pmm_state = state; +} + +#ifdef BUILD_IU +int sgsn_ranap_rab_ass_resp(struct sgsn_mm_ctx *ctx, RANAP_RAB_SetupOrModifiedItemIEs_t *setup_ies); +int sgsn_ranap_iu_event(struct ue_conn_ctx *ctx, enum iu_event_type type, void *data) +{ + struct sgsn_mm_ctx *mm; + int rc = -1; + + mm = sgsn_mm_ctx_by_ue_ctx(ctx); + if (!mm) { + LOGP(DRANAP, LOGL_NOTICE, "Cannot find mm ctx for IU event %i!\n", type); + return rc; + } + + switch (type) { + case IU_EVENT_RAB_ASSIGN: + rc = sgsn_ranap_rab_ass_resp(mm, (RANAP_RAB_SetupOrModifiedItemIEs_t *)data); + break; + case IU_EVENT_IU_RELEASE: + /* fall thru */ + case IU_EVENT_LINK_INVALIDATED: + /* Clean up ue_conn_ctx here */ + LOGMMCTXP(LOGL_INFO, mm, "IU release for imsi %s\n", mm->imsi); + if (mm->pmm_state == PMM_CONNECTED) + mmctx_set_pmm_state(mm, PMM_IDLE); + rc = 0; + break; + case IU_EVENT_SECURITY_MODE_COMPLETE: + /* Continue authentication here */ + mm->iu.ue_ctx->integrity_active = 1; + rc = gsm48_gmm_authorize(mm); + break; + default: + LOGP(DRANAP, LOGL_NOTICE, "Unknown event received: %i\n", type); + rc = -1; + break; + } + return rc; +} +#endif + + +/* Our implementation, should be kept in SGSN */ + +static void mmctx_timer_cb(void *_mm); + +static void mmctx_timer_start(struct sgsn_mm_ctx *mm, unsigned int T, + unsigned int seconds) +{ + if (osmo_timer_pending(&mm->timer)) + LOGMMCTXP(LOGL_ERROR, mm, "Starting MM timer %u while old " + "timer %u pending\n", T, mm->T); + mm->T = T; + mm->num_T_exp = 0; + + /* FIXME: we should do this only once ? */ + osmo_timer_setup(&mm->timer, mmctx_timer_cb, mm); + osmo_timer_schedule(&mm->timer, seconds, 0); +} + +static void mmctx_timer_stop(struct sgsn_mm_ctx *mm, unsigned int T) +{ + if (mm->T != T) + LOGMMCTXP(LOGL_ERROR, mm, "Stopping MM timer %u but " + "%u is running\n", T, mm->T); + osmo_timer_del(&mm->timer); +} + +time_t gprs_max_time_to_idle(void) +{ + return sgsn->cfg.timers.T3314 + (sgsn->cfg.timers.T3312 + 4 * 60); +} + +/* Send a message through the underlying layer. + * For param encryptable, see 3GPP TS 24.008 § 4.7.1.2 and + * gsm48_hdr_gmm_cipherable(). Pass false for not cipherable messages. */ +static int gsm48_gmm_sendmsg(struct msgb *msg, int command, + struct sgsn_mm_ctx *mm, bool encryptable) +{ + if (mm) { + rate_ctr_inc(&mm->ctrg->ctr[GMM_CTR_PKTS_SIG_OUT]); +#ifdef BUILD_IU + if (mm->ran_type == MM_CTX_T_UTRAN_Iu) + return iu_tx(msg, GPRS_SAPI_GMM); +#endif + } + +#ifdef BUILD_IU + /* In Iu mode, msg->dst contains the ue_conn_ctx pointer, in Gb mode + * dst is empty. */ + /* FIXME: have a more explicit indicator for Iu messages */ + if (msg->dst) + return iu_tx(msg, GPRS_SAPI_GMM); +#endif + + /* caller needs to provide TLLI, BVCI and NSEI */ + return gprs_llc_tx_ui(msg, GPRS_SAPI_GMM, command, mm, encryptable); +} + +/* copy identifiers from old message to new message, this + * is required so lower layers can route it correctly */ +static void gmm_copy_id(struct msgb *msg, const struct msgb *old) +{ + msgb_tlli(msg) = msgb_tlli(old); + msgb_bvci(msg) = msgb_bvci(old); + msgb_nsei(msg) = msgb_nsei(old); + msg->dst = old->dst; +} + +/* Store BVCI/NSEI in MM context */ +static void msgid2mmctx(struct sgsn_mm_ctx *mm, const struct msgb *msg) +{ + mm->gb.bvci = msgb_bvci(msg); + mm->gb.nsei = msgb_nsei(msg); + /* In case a Iu connection is reconnected we need to update the ue ctx */ + mm->iu.ue_ctx = msg->dst; +} + +/* Store BVCI/NSEI in MM context */ +static void mmctx2msgid(struct msgb *msg, const struct sgsn_mm_ctx *mm) +{ + msgb_tlli(msg) = mm->gb.tlli; + msgb_bvci(msg) = mm->gb.bvci; + msgb_nsei(msg) = mm->gb.nsei; + msg->dst = mm->iu.ue_ctx; +} + +static void mm_ctx_cleanup_free(struct sgsn_mm_ctx *ctx, const char *log_text) +{ + LOGMMCTXP(LOGL_INFO, ctx, "Cleaning MM context due to %s\n", log_text); + + /* Mark MM state as deregistered */ + ctx->gmm_state = GMM_DEREGISTERED; + mmctx_set_pmm_state(ctx, PMM_DETACHED); + mmctx_set_pmm_state(ctx, MM_IDLE); + + sgsn_mm_ctx_cleanup_free(ctx); +} + +/* Chapter 9.4.18 */ +static int _tx_status(struct msgb *msg, uint8_t cause, + struct sgsn_mm_ctx *mmctx, int sm) +{ + struct gsm48_hdr *gh; + + /* MMCTX might be NULL! */ + + DEBUGP(DMM, "<- GPRS MM STATUS (cause: %s)\n", + get_value_string(gsm48_gmm_cause_names, cause)); + + gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); + if (sm) { + gh->proto_discr = GSM48_PDISC_SM_GPRS; + gh->msg_type = GSM48_MT_GSM_STATUS; + } else { + gh->proto_discr = GSM48_PDISC_MM_GPRS; + gh->msg_type = GSM48_MT_GMM_STATUS; + } + gh->data[0] = cause; + + return gsm48_gmm_sendmsg(msg, 0, mmctx, true); +} + +static int gsm48_tx_gmm_status(struct sgsn_mm_ctx *mmctx, uint8_t cause) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 GMM STATUS"); + + mmctx2msgid(msg, mmctx); + return _tx_status(msg, cause, mmctx, 0); +} + +static int gsm48_tx_sm_status(struct sgsn_mm_ctx *mmctx, uint8_t cause) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 SM STATUS"); + + mmctx2msgid(msg, mmctx); + return _tx_status(msg, cause, mmctx, 1); +} + +static int _tx_detach_req(struct msgb *msg, uint8_t detach_type, uint8_t cause, + struct sgsn_mm_ctx *mmctx) +{ + struct gsm48_hdr *gh; + + /* MMCTX might be NULL! */ + + DEBUGP(DMM, "<- GPRS MM DETACH REQ (type: %s, cause: %s)\n", + get_value_string(gprs_det_t_mt_strs, detach_type), + get_value_string(gsm48_gmm_cause_names, cause)); + + gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); + + gh->proto_discr = GSM48_PDISC_MM_GPRS; + gh->msg_type = GSM48_MT_GMM_DETACH_REQ; + gh->data[0] = detach_type & 0x07; + + msgb_tv_put(msg, GSM48_IE_GMM_CAUSE, cause); + + return gsm48_gmm_sendmsg(msg, 0, mmctx, true); +} + +static int gsm48_tx_gmm_detach_req(struct sgsn_mm_ctx *mmctx, + uint8_t detach_type, uint8_t cause) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 DET REQ"); + + mmctx2msgid(msg, mmctx); + return _tx_detach_req(msg, detach_type, cause, mmctx); +} + +static int gsm48_tx_gmm_detach_req_oldmsg(struct msgb *oldmsg, + uint8_t detach_type, uint8_t cause) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 DET OLD"); + + gmm_copy_id(msg, oldmsg); + return _tx_detach_req(msg, detach_type, cause, NULL); +} + +static struct gsm48_qos default_qos = { + .delay_class = 4, /* best effort */ + .reliab_class = GSM48_QOS_RC_LLC_UN_RLC_ACK_DATA_PROT, + .peak_tput = GSM48_QOS_PEAK_TPUT_32000bps, + .preced_class = GSM48_QOS_PC_NORMAL, + .mean_tput = GSM48_QOS_MEAN_TPUT_BEST_EFFORT, + .traf_class = GSM48_QOS_TC_INTERACTIVE, + .deliv_order = GSM48_QOS_DO_UNORDERED, + .deliv_err_sdu = GSM48_QOS_ERRSDU_YES, + .max_sdu_size = GSM48_QOS_MAXSDU_1520, + .max_bitrate_up = GSM48_QOS_MBRATE_63k, + .max_bitrate_down = GSM48_QOS_MBRATE_63k, + .resid_ber = GSM48_QOS_RBER_5e_2, + .sdu_err_ratio = GSM48_QOS_SERR_1e_2, + .handling_prio = 3, + .xfer_delay = 0x10, /* 200ms */ + .guar_bitrate_up = GSM48_QOS_MBRATE_0k, + .guar_bitrate_down = GSM48_QOS_MBRATE_0k, + .sig_ind = 0, /* not optimised for signalling */ + .max_bitrate_down_ext = 0, /* use octet 9 */ + .guar_bitrate_down_ext = 0, /* use octet 13 */ +}; + +/* Chapter 9.4.2: Attach accept */ +static int gsm48_tx_gmm_att_ack(struct sgsn_mm_ctx *mm) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 ATT ACK"); + struct gsm48_hdr *gh; + struct gsm48_attach_ack *aa; + uint8_t *mid; +#if 0 + uint8_t *ptsig; +#endif + + LOGMMCTXP(LOGL_INFO, mm, "<- GPRS ATTACH ACCEPT (new P-TMSI=0x%08x)\n", mm->p_tmsi); + rate_ctr_inc(&sgsn->rate_ctrs->ctr[CTR_GPRS_ATTACH_ACKED]); + + mmctx2msgid(msg, mm); + + gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + gh->proto_discr = GSM48_PDISC_MM_GPRS; + gh->msg_type = GSM48_MT_GMM_ATTACH_ACK; + + aa = (struct gsm48_attach_ack *) msgb_put(msg, sizeof(*aa)); + aa->force_stby = 0; /* not indicated */ + aa->att_result = 1; /* GPRS only */ + aa->ra_upd_timer = gprs_secs_to_tmr_floor(sgsn->cfg.timers.T3312); + aa->radio_prio = 4; /* lowest */ + gsm48_construct_ra(aa->ra_id.digits, &mm->ra); + +#if 0 + /* Optional: P-TMSI signature */ + msgb_v_put(msg, GSM48_IE_GMM_PTMSI_SIG); + ptsig = msgb_put(msg, 3); + ptsig[0] = mm->p_tmsi_sig >> 16; + ptsig[1] = mm->p_tmsi_sig >> 8; + ptsig[2] = mm->p_tmsi_sig & 0xff; + +#endif + /* Optional: Negotiated Ready timer value + * (fixed 44s, default value, GSM 04.08, table 11.4a) to safely limit + * the inactivity time READY->STANDBY. + */ + msgb_tv_put(msg, GSM48_IE_GMM_TIMER_READY, + gprs_secs_to_tmr_floor(sgsn->cfg.timers.T3314)); + +#ifdef PTMSI_ALLOC + /* Optional: Allocated P-TMSI */ + mid = msgb_put(msg, GSM48_MID_TMSI_LEN); + gsm48_generate_mid_from_tmsi(mid, mm->p_tmsi); + mid[0] = GSM48_IE_GMM_ALLOC_PTMSI; +#endif + + /* Optional: MS-identity (combined attach) */ + /* Optional: GMM cause (partial attach result for combined attach) */ + + return gsm48_gmm_sendmsg(msg, 0, mm, true); +} + +/* Chapter 9.4.5: Attach reject */ +static int _tx_gmm_att_rej(struct msgb *msg, uint8_t gmm_cause, + const struct sgsn_mm_ctx *mm) +{ + struct gsm48_hdr *gh; + + LOGMMCTXP(LOGL_NOTICE, mm, "<- GPRS ATTACH REJECT: %s\n", + get_value_string(gsm48_gmm_cause_names, gmm_cause)); + rate_ctr_inc(&sgsn->rate_ctrs->ctr[CTR_GPRS_ATTACH_REJECTED]); + + 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, false); +} +static int gsm48_tx_gmm_att_rej_oldmsg(const struct msgb *old_msg, + uint8_t gmm_cause) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 ATT REJ OLD"); + gmm_copy_id(msg, old_msg); + return _tx_gmm_att_rej(msg, gmm_cause, NULL); +} +static int gsm48_tx_gmm_att_rej(struct sgsn_mm_ctx *mm, + uint8_t gmm_cause) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 ATT REJ"); + mmctx2msgid(msg, mm); + return _tx_gmm_att_rej(msg, gmm_cause, mm); +} + +/* Chapter 9.4.6.2 Detach accept */ +static int _tx_detach_ack(struct msgb *msg, uint8_t force_stby, + struct sgsn_mm_ctx *mm) +{ + struct gsm48_hdr *gh; + + /* MMCTX might be NULL! */ + + DEBUGP(DMM, "<- GPRS MM DETACH ACC (force-standby: %d)\n", force_stby); + rate_ctr_inc(&sgsn->rate_ctrs->ctr[CTR_GPRS_DETACH_ACKED]); + + 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, true); +} + +static int gsm48_tx_gmm_det_ack(struct sgsn_mm_ctx *mm, uint8_t force_stby) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 DET ACK"); + + mmctx2msgid(msg, mm); + return _tx_detach_ack(msg, force_stby, mm); +} + +static int gsm48_tx_gmm_det_ack_oldmsg(struct msgb *oldmsg, uint8_t force_stby) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 DET ACK OLD"); + + gmm_copy_id(msg, oldmsg); + return _tx_detach_ack(msg, force_stby, NULL); +} + +/* Transmit Chapter 9.4.12 Identity Request */ +static int gsm48_tx_gmm_id_req(struct sgsn_mm_ctx *mm, uint8_t id_type) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 ID REQ"); + struct gsm48_hdr *gh; + + LOGMMCTXP(LOGL_DEBUG, mm, "<- GPRS IDENTITY REQUEST: mi_type=%s\n", + gsm48_mi_type_name(id_type)); + + mmctx2msgid(msg, mm); + + gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); + gh->proto_discr = GSM48_PDISC_MM_GPRS; + gh->msg_type = GSM48_MT_GMM_ID_REQ; + /* 10.5.5.9 ID type 2 + identity type and 10.5.5.7 'force to standby' IE */ + gh->data[0] = id_type & 0xf; + + return gsm48_gmm_sendmsg(msg, 1, mm, false); +} + +/* determine if the MS/UE supports R99 or later */ +static bool mmctx_is_r99(const struct sgsn_mm_ctx *mm) +{ + if (mm->ms_network_capa.len < 1) + return false; + if (mm->ms_network_capa.buf[0] & 0x01) + return true; + return false; +} + +/* 3GPP TS 24.008 Section 9.4.9: Authentication and Ciphering Request */ +static int gsm48_tx_gmm_auth_ciph_req(struct sgsn_mm_ctx *mm, + const struct osmo_auth_vector *vec, + uint8_t key_seq, bool force_standby) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 AUTH CIPH REQ"); + struct gsm48_hdr *gh; + struct gsm48_auth_ciph_req *acreq; + uint8_t *m_rand, *m_cksn, rbyte; + + LOGMMCTXP(LOGL_INFO, mm, "<- GPRS AUTH AND CIPHERING REQ (rand = %s", + osmo_hexdump(vec->rand, sizeof(vec->rand))); + if (mmctx_is_r99(mm) && vec + && (vec->auth_types & OSMO_AUTH_TYPE_UMTS)) { + LOGPC(DMM, LOGL_INFO, ", autn = %s)\n", + osmo_hexdump(vec->autn, sizeof(vec->autn))); + } else + LOGPC(DMM, LOGL_INFO, ")\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_REQ; + + acreq = (struct gsm48_auth_ciph_req *) msgb_put(msg, sizeof(*acreq)); + acreq->ciph_alg = mm->ciph_algo & 0xf; + /* § 10.5.5.10: */ + acreq->imeisv_req = 0x1; + /* § 10.5.5.7: */ + acreq->force_stby = force_standby; + /* 3GPP TS 24.008 § 10.5.5.19: */ + if (RAND_bytes(&rbyte, 1) != 1) { + LOGP(DMM, LOGL_NOTICE, "RAND_bytes failed for A&C ref, falling " + "back to rand()\n"); + acreq->ac_ref_nr = rand(); + } else + acreq->ac_ref_nr = rbyte; + mm->ac_ref_nr_used = acreq->ac_ref_nr; + + /* Only if authentication is requested we need to set RAND + CKSN */ + if (vec) { + m_rand = msgb_put(msg, sizeof(vec->rand) + 1); + m_rand[0] = GSM48_IE_GMM_AUTH_RAND; + memcpy(m_rand + 1, vec->rand, sizeof(vec->rand)); + + /* § 10.5.1.2: */ + m_cksn = msgb_put(msg, 1); + m_cksn[0] = (GSM48_IE_GMM_CIPH_CKSN << 4) | (key_seq & 0x07); + + /* A Release99 or higher MS/UE must be able to handle + * the optional AUTN IE. If a classic GSM SIM is + * inserted, it will simply ignore AUTN and just use + * RAND */ + if (mmctx_is_r99(mm) && + (vec->auth_types & OSMO_AUTH_TYPE_UMTS)) { + msgb_tlv_put(msg, GSM48_IE_GMM_AUTN, + sizeof(vec->autn), vec->autn); + } + } + + return gsm48_gmm_sendmsg(msg, 1, mm, false); +} + +/* Section 9.4.11: Authentication and Ciphering Reject */ +static int gsm48_tx_gmm_auth_ciph_rej(struct sgsn_mm_ctx *mm) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 AUTH CIPH REJ"); + struct gsm48_hdr *gh; + + LOGMMCTXP(LOGL_NOTICE, mm, "<- GPRS AUTH AND CIPH REJECT\n"); + + mmctx2msgid(msg, mm); + + gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + gh->proto_discr = GSM48_PDISC_MM_GPRS; + gh->msg_type = GSM48_MT_GMM_AUTH_CIPH_REJ; + + return gsm48_gmm_sendmsg(msg, 0, mm, false); +} + +/* check if the received authentication response matches */ +static bool check_auth_resp(struct sgsn_mm_ctx *ctx, + bool is_utran, + const struct osmo_auth_vector *vec, + const uint8_t *res, uint8_t res_len) +{ + const uint8_t *expect_res; + uint8_t expect_res_len; + enum osmo_sub_auth_type expect_type; + const char *expect_str; + + if (!vec) + return true; /* really!? */ + + /* On UTRAN (3G) we always expect UMTS AKA. On GERAN (2G) we sent AUTN + * and expect UMTS AKA if there is R99 capability and our vector + * supports UMTS AKA, otherwise we expect GSM AKA. */ + if (is_utran + || (mmctx_is_r99(ctx) && (vec->auth_types & OSMO_AUTH_TYPE_UMTS))) { + expect_type = OSMO_AUTH_TYPE_UMTS; + expect_str = "UMTS RES"; + expect_res = vec->res; + expect_res_len = vec->res_len; + } else { + expect_type = OSMO_AUTH_TYPE_GSM; + expect_str = "GSM SRES"; + expect_res = vec->sres; + expect_res_len = sizeof(vec->sres); + } + + if (!(vec->auth_types & expect_type)) { + LOGMMCTXP(LOGL_ERROR, ctx, "Auth error: auth vector does" + " not provide the expected auth type:" + " expected %s = 0x%x, auth_types are 0x%x\n", + expect_str, expect_type, vec->auth_types); + return false; + } + + if (!res) + goto auth_mismatch; + + if (res_len != expect_res_len) + goto auth_mismatch; + + if (memcmp(res, expect_res, res_len) != 0) + goto auth_mismatch; + + /* Authorized! */ + return true; + +auth_mismatch: + LOGMMCTXP(LOGL_ERROR, ctx, "Auth mismatch: expected %s = %s\n", + expect_str, osmo_hexdump_nospc(expect_res, expect_res_len)); + return false; +} + +/* Section 9.4.10: Authentication and Ciphering Response */ +static int gsm48_rx_gmm_auth_ciph_resp(struct sgsn_mm_ctx *ctx, + struct msgb *msg) +{ + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); + struct gsm48_auth_ciph_resp *acr = (struct gsm48_auth_ciph_resp *)gh->data; + struct tlv_parsed tp; + struct gsm_auth_tuple *at; + const char *res_name = "(no response)"; + uint8_t res[16]; + uint8_t res_len; + int rc; + + LOGMMCTXP(LOGL_INFO, ctx, "-> GPRS AUTH AND CIPH RESPONSE\n"); + + if (ctx->auth_triplet.key_seq == GSM_KEY_SEQ_INVAL) { + LOGMMCTXP(LOGL_NOTICE, ctx, + "Unexpected Auth & Ciph Response (ignored)\n"); + return 0; + } + + if (acr->ac_ref_nr != ctx->ac_ref_nr_used) { + LOGMMCTXP(LOGL_NOTICE, ctx, "Reference mismatch for Auth & Ciph" + " Response: %u received, %u expected\n", + acr->ac_ref_nr, ctx->ac_ref_nr_used); + return 0; + } + + /* Stop T3360 */ + mmctx_timer_stop(ctx, 3360); + + tlv_parse(&tp, &gsm48_gmm_att_tlvdef, acr->data, + (msg->data + msg->len) - acr->data, 0, 0); + + if (!TLVP_PRESENT(&tp, GSM48_IE_GMM_AUTH_SRES) || + !TLVP_PRESENT(&tp, GSM48_IE_GMM_IMEISV) || + TLVP_LEN(&tp,GSM48_IE_GMM_AUTH_SRES) != 4) { + /* TODO: missing mandatory IE, return STATUS or REJ? */ + LOGMMCTXP(LOGL_ERROR, ctx, "Missing mandantory IE\n"); + return -EINVAL; + } + + /* Start with the good old 4-byte SRES */ + memcpy(res, TLVP_VAL(&tp, GSM48_IE_GMM_AUTH_SRES), 4); + res_len = 4; + res_name = "GSM SRES"; + + /* Append extended RES as part of UMTS AKA, if any */ + if (TLVP_PRESENT(&tp, GSM48_IE_GMM_AUTH_RES_EXT)) { + unsigned int l = TLVP_LEN(&tp, GSM48_IE_GMM_AUTH_RES_EXT); + if (l > sizeof(res)-4) + l = sizeof(res)-4; + memcpy(res+4, TLVP_VAL(&tp, GSM48_IE_GMM_AUTH_RES_EXT), l); + res_len += l; + res_name = "UMTS RES"; + } + + at = &ctx->auth_triplet; + + LOGMMCTXP(LOGL_DEBUG, ctx, "checking auth: received %s = %s\n", + res_name, osmo_hexdump(res, res_len)); + rc = check_auth_resp(ctx, false, &at->vec, res, res_len); + if (!rc) { + rc = gsm48_tx_gmm_auth_ciph_rej(ctx); + mm_ctx_cleanup_free(ctx, "GPRS AUTH AND CIPH REJECT"); + return rc; + } + + ctx->is_authenticated = 1; + + if (ctx->ran_type == MM_CTX_T_UTRAN_Iu) + ctx->iu.new_key = 1; + + /* FIXME: enable LLC cipheirng */ + + /* Check if we can let the mobile station enter */ + return gsm48_gmm_authorize(ctx); +} + +/* Section 9.4.10: Authentication and Ciphering Failure */ +static int gsm48_rx_gmm_auth_ciph_fail(struct sgsn_mm_ctx *ctx, + struct msgb *msg) +{ + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); + struct tlv_parsed tp; + const uint8_t gmm_cause = gh->data[0]; + const uint8_t *auts; + int rc; + + LOGMMCTXP(LOGL_INFO, ctx, "-> GPRS AUTH AND CIPH FAILURE (cause = %s)\n", + get_value_string(gsm48_gmm_cause_names, gmm_cause)); + + tlv_parse(&tp, &gsm48_gmm_att_tlvdef, gh->data+1, msg->len - 1, 0, 0); + + /* Only if GMM cause is present and the AUTS is provided, we can + * start re-sync procedure */ + if (gmm_cause == GMM_CAUSE_SYNC_FAIL && + TLVP_PRESENT(&tp, GSM48_IE_GMM_AUTH_FAIL_PAR)) { + if (TLVP_LEN(&tp, GSM48_IE_GMM_AUTH_FAIL_PAR) != 14) { + LOGMMCTXP(LOGL_ERROR, ctx, "AUTS IE has wrong size:" + " expected %d, got %u\n", 14, + TLVP_LEN(&tp, GSM48_IE_GMM_AUTH_FAIL_PAR)); + return -EINVAL; + } + auts = TLVP_VAL(&tp, GSM48_IE_GMM_AUTH_FAIL_PAR); + + LOGMMCTXP(LOGL_INFO, ctx, + "R99 AUTHENTICATION SYNCH (AUTS = %s)\n", + osmo_hexdump_nospc(auts, 14)); + + /* make sure we'll refresh the auth_triplet in + * sgsn_auth_update() */ + ctx->auth_triplet.key_seq = GSM_KEY_SEQ_INVAL; + + /* make sure we'll retry authentication after the resync */ + ctx->auth_state = SGSN_AUTH_UMTS_RESYNC; + + /* Send AUTS to HLR and wait for new Auth Info Result */ + rc = gprs_subscr_request_auth_info(ctx, auts, + ctx->auth_triplet.vec.rand); + if (!rc) + return 0; + /* on error, fall through to send a reject */ + LOGMMCTXP(LOGL_ERROR, ctx, + "Sending AUTS to HLR failed (rc = %d)\n", rc); + } + + LOGMMCTXP(LOGL_NOTICE, ctx, "Authentication failed\n"); + rc = gsm48_tx_gmm_auth_ciph_rej(ctx); + mm_ctx_cleanup_free(ctx, "GPRS AUTH FAILURE"); + return rc; +} + +static void extract_subscr_msisdn(struct sgsn_mm_ctx *ctx) +{ + struct gsm_mncc_number called; + uint8_t msisdn[sizeof(ctx->subscr->sgsn_data->msisdn) + 1]; + + /* Convert MSISDN from encoded to string.. */ + if (!ctx->subscr) + return; + + if (ctx->subscr->sgsn_data->msisdn_len < 1) + return; + + /* prepare the data for the decoder */ + memset(&called, 0, sizeof(called)); + msisdn[0] = ctx->subscr->sgsn_data->msisdn_len; + memcpy(&msisdn[1], ctx->subscr->sgsn_data->msisdn, + ctx->subscr->sgsn_data->msisdn_len); + + /* decode the string now */ + gsm48_decode_called(&called, msisdn); + + /* Prepend a '+' for international numbers */ + if (called.plan == 1 && called.type == 1) { + ctx->msisdn[0] = '+'; + osmo_strlcpy(&ctx->msisdn[1], called.number, + sizeof(ctx->msisdn)); + } else { + osmo_strlcpy(ctx->msisdn, called.number, sizeof(ctx->msisdn)); + } +} + +static void extract_subscr_hlr(struct sgsn_mm_ctx *ctx) +{ + struct gsm_mncc_number called; + uint8_t hlr_number[sizeof(ctx->subscr->sgsn_data->hlr) + 1]; + + if (!ctx->subscr) + return; + + if (ctx->subscr->sgsn_data->hlr_len < 1) + return; + + /* prepare the data for the decoder */ + memset(&called, 0, sizeof(called)); + hlr_number[0] = ctx->subscr->sgsn_data->hlr_len; + memcpy(&hlr_number[1], ctx->subscr->sgsn_data->hlr, + ctx->subscr->sgsn_data->hlr_len); + + /* decode the string now */ + gsm48_decode_called(&called, hlr_number); + + if (called.plan != 1) { + LOGMMCTXP(LOGL_ERROR, ctx, + "Numbering plan(%d) not allowed\n", + called.plan); + return; + } + + if (called.type != 1) { + LOGMMCTXP(LOGL_ERROR, ctx, + "Numbering type(%d) not allowed\n", + called.type); + return; + } + + osmo_strlcpy(ctx->hlr, called.number, sizeof(ctx->hlr)); +} + +#ifdef BUILD_IU +/* Chapter 9.4.21: Service accept */ +static int gsm48_tx_gmm_service_ack(struct sgsn_mm_ctx *mm) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 SERVICE ACK"); + struct gsm48_hdr *gh; + + LOGMMCTXP(LOGL_INFO, mm, "<- GPRS SERVICE ACCEPT (P-TMSI=0x%08x)\n", mm->p_tmsi); + + mmctx2msgid(msg, mm); + + gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + gh->proto_discr = GSM48_PDISC_MM_GPRS; + gh->msg_type = GSM48_MT_GMM_SERVICE_ACK; + + /* Optional: PDP context status */ + /* Optional: MBMS context status */ + + return gsm48_gmm_sendmsg(msg, 0, mm, false); +} +#endif + +/* Chapter 9.4.22: Service reject */ +static int _tx_gmm_service_rej(struct msgb *msg, uint8_t gmm_cause, + const struct sgsn_mm_ctx *mm) +{ + struct gsm48_hdr *gh; + + LOGMMCTXP(LOGL_NOTICE, mm, "<- GPRS SERVICE REJECT: %s\n", + get_value_string(gsm48_gmm_cause_names, gmm_cause)); + + gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); + gh->proto_discr = GSM48_PDISC_MM_GPRS; + gh->msg_type = GSM48_MT_GMM_SERVICE_REJ; + gh->data[0] = gmm_cause; + + return gsm48_gmm_sendmsg(msg, 0, NULL, true); +} +static int gsm48_tx_gmm_service_rej_oldmsg(const struct msgb *old_msg, + uint8_t gmm_cause) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 SERVICE REJ OLD"); + gmm_copy_id(msg, old_msg); + return _tx_gmm_service_rej(msg, gmm_cause, NULL); +} +#if 0 +-- currently unused -- +static int gsm48_tx_gmm_service_rej(struct sgsn_mm_ctx *mm, + uint8_t gmm_cause) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 SERVICE REJ"); + mmctx2msgid(msg, mm); + return _tx_gmm_service_rej(msg, gmm_cause, mm); +} +#endif + +static int gsm48_tx_gmm_ra_upd_ack(struct sgsn_mm_ctx *mm); + +#ifdef BUILD_IU +void activate_pdp_rabs(struct sgsn_mm_ctx *ctx) +{ + /* Send RAB activation requests for all PDP contexts */ + struct sgsn_pdp_ctx *pdp; + llist_for_each_entry(pdp, &ctx->pdp_list, list) { + iu_rab_act_ps(pdp->nsapi, pdp, 1); + } +} +#endif + +/* Check if we can already authorize a subscriber */ +static int gsm48_gmm_authorize(struct sgsn_mm_ctx *ctx) +{ +#ifdef BUILD_IU + int rc; +#endif +#ifndef PTMSI_ALLOC + struct sgsn_signal_data sig_data; +#endif + + /* Request IMSI and IMEI from the MS if they are unknown */ + if (!strlen(ctx->imei)) { + ctx->t3370_id_type = GSM_MI_TYPE_IMEI; + mmctx_timer_start(ctx, 3370, sgsn->cfg.timers.T3370); + return gsm48_tx_gmm_id_req(ctx, GSM_MI_TYPE_IMEI); + } + if (!strlen(ctx->imsi)) { + ctx->t3370_id_type = GSM_MI_TYPE_IMSI; + mmctx_timer_start(ctx, 3370, sgsn->cfg.timers.T3370); + return gsm48_tx_gmm_id_req(ctx, GSM_MI_TYPE_IMSI); + } + + /* All information required for authentication is available */ + ctx->t3370_id_type = GSM_MI_TYPE_NONE; + + if (ctx->auth_state == SGSN_AUTH_UNKNOWN) { + /* Request authorization, this leads to a call to + * sgsn_auth_update which in turn calls + * gsm0408_gprs_access_granted or gsm0408_gprs_access_denied */ + + sgsn_auth_request(ctx); + /* Note that gsm48_gmm_authorize can be called recursively via + * sgsn_auth_request iff ctx->auth_info changes to AUTH_ACCEPTED + */ + return 0; + } + + if (ctx->auth_state == SGSN_AUTH_AUTHENTICATE && !ctx->is_authenticated) { + struct gsm_auth_tuple *at = &ctx->auth_triplet; + + mmctx_timer_start(ctx, 3360, sgsn->cfg.timers.T3360); + return gsm48_tx_gmm_auth_ciph_req(ctx, &at->vec, at->key_seq, + false); + } + + if (ctx->auth_state == SGSN_AUTH_AUTHENTICATE && ctx->is_authenticated && + ctx->auth_triplet.key_seq != GSM_KEY_SEQ_INVAL) { + /* Check again for authorization */ + sgsn_auth_request(ctx); + return 0; + } + + if (ctx->auth_state != SGSN_AUTH_ACCEPTED) { + LOGMMCTXP(LOGL_NOTICE, ctx, + "authorization is denied, aborting procedure\n"); + return -EACCES; + } + + /* The MS is authorized */ +#ifdef BUILD_IU + if (ctx->ran_type == MM_CTX_T_UTRAN_Iu && !ctx->iu.ue_ctx->integrity_active) { + rc = iu_tx_sec_mode_cmd(ctx->iu.ue_ctx, &ctx->auth_triplet, 0, ctx->iu.new_key); + ctx->iu.new_key = 0; + return rc; + } +#endif + + switch (ctx->pending_req) { + case 0: + LOGMMCTXP(LOGL_INFO, ctx, + "no pending request, authorization completed\n"); + break; + case GSM48_MT_GMM_ATTACH_REQ: + ctx->pending_req = 0; + + extract_subscr_msisdn(ctx); + extract_subscr_hlr(ctx); +#ifdef PTMSI_ALLOC + /* Start T3350 and re-transmit up to 5 times until ATTACH COMPLETE */ + mmctx_timer_start(ctx, 3350, sgsn->cfg.timers.T3350); + ctx->t3350_mode = GMM_T3350_MODE_ATT; +#else + memset(&sig_data, 0, sizeof(sig_data)); + sig_data.mm = mmctx; + osmo_signal_dispatch(SS_SGSN, S_SGSN_ATTACH, &sig_data); + ctx->gmm_state = GMM_REGISTERED_NORMAL; +#endif + + return gsm48_tx_gmm_att_ack(ctx); +#ifdef BUILD_IU + case GSM48_MT_GMM_SERVICE_REQ: + ctx->pending_req = 0; + mmctx_set_pmm_state(ctx, PMM_CONNECTED); + rc = gsm48_tx_gmm_service_ack(ctx); + + if (ctx->iu.service.type != GPRS_SERVICE_T_SIGNALLING) + activate_pdp_rabs(ctx); + + return rc; +#endif + case GSM48_MT_GMM_RA_UPD_REQ: + ctx->pending_req = 0; + /* Send RA UPDATE ACCEPT */ + return gsm48_tx_gmm_ra_upd_ack(ctx); + + default: + LOGMMCTXP(LOGL_ERROR, ctx, + "only Attach Request is supported yet, " + "got request type %u\n", ctx->pending_req); + break; + } + + return 0; +} + +void gsm0408_gprs_authenticate(struct sgsn_mm_ctx *ctx) +{ + ctx->is_authenticated = 0; + + gsm48_gmm_authorize(ctx); +} + +void gsm0408_gprs_access_granted(struct sgsn_mm_ctx *ctx) +{ + switch (ctx->gmm_state) { + case GMM_COMMON_PROC_INIT: + LOGMMCTXP(LOGL_NOTICE, ctx, + "Authorized, continuing procedure, IMSI=%s\n", + ctx->imsi); + /* Continue with the authorization */ + gsm48_gmm_authorize(ctx); + break; + default: + LOGMMCTXP(LOGL_INFO, ctx, + "Authorized, ignored, IMSI=%s\n", + ctx->imsi); + } +} + +void gsm0408_gprs_access_denied(struct sgsn_mm_ctx *ctx, int gmm_cause) +{ + if (gmm_cause == SGSN_ERROR_CAUSE_NONE) + gmm_cause = GMM_CAUSE_GPRS_NOTALLOWED; + + switch (ctx->gmm_state) { + case GMM_COMMON_PROC_INIT: + LOGMMCTXP(LOGL_NOTICE, ctx, + "Not authorized, rejecting ATTACH REQUEST " + "with cause '%s' (%d)\n", + get_value_string(gsm48_gmm_cause_names, gmm_cause), + gmm_cause); + gsm48_tx_gmm_att_rej(ctx, gmm_cause); + mm_ctx_cleanup_free(ctx, "GPRS ATTACH REJECT"); + break; + case GMM_REGISTERED_NORMAL: + case GMM_REGISTERED_SUSPENDED: + LOGMMCTXP(LOGL_NOTICE, ctx, + "Authorization lost, detaching " + "with cause '%s' (%d)\n", + get_value_string(gsm48_gmm_cause_names, gmm_cause), + gmm_cause); + gsm48_tx_gmm_detach_req( + ctx, GPRS_DET_T_MT_REATT_NOTREQ, gmm_cause); + + mm_ctx_cleanup_free(ctx, "auth lost"); + break; + default: + LOGMMCTXP(LOGL_INFO, ctx, + "Authorization lost, cause is '%s' (%d)\n", + get_value_string(gsm48_gmm_cause_names, gmm_cause), + gmm_cause); + mm_ctx_cleanup_free(ctx, "auth lost"); + } +} + +void gsm0408_gprs_access_cancelled(struct sgsn_mm_ctx *ctx, int gmm_cause) +{ + if (gmm_cause != SGSN_ERROR_CAUSE_NONE) { + LOGMMCTXP(LOGL_INFO, ctx, + "Cancelled with cause '%s' (%d), deleting context\n", + get_value_string(gsm48_gmm_cause_names, gmm_cause), + gmm_cause); + gsm0408_gprs_access_denied(ctx, gmm_cause); + return; + } + + LOGMMCTXP(LOGL_INFO, ctx, "Cancelled, deleting context silently\n"); + mm_ctx_cleanup_free(ctx, "access cancelled"); +} + +/* Parse Chapter 9.4.13 Identity Response */ +static int gsm48_rx_gmm_id_resp(struct sgsn_mm_ctx *ctx, struct msgb *msg) +{ + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); + uint8_t mi_type = gh->data[1] & GSM_MI_TYPE_MASK; + char mi_string[GSM48_MI_SIZE]; + + gsm48_mi_to_string(mi_string, sizeof(mi_string), &gh->data[1], gh->data[0]); + if (!ctx) { + DEBUGP(DMM, "from unknown TLLI 0x%08x?!? This should not happen\n", msgb_tlli(msg)); + return -EINVAL; + } + + LOGMMCTXP(LOGL_DEBUG, ctx, "-> GMM IDENTITY RESPONSE: MI(%s)=%s\n", + gsm48_mi_type_name(mi_type), mi_string); + + if (ctx->t3370_id_type == GSM_MI_TYPE_NONE) { + LOGMMCTXP(LOGL_NOTICE, ctx, + "Got unexpected IDENTITY RESPONSE: MI(%s)=%s, " + "ignoring message\n", + gsm48_mi_type_name(mi_type), mi_string); + return -EINVAL; + } + + if (mi_type == ctx->t3370_id_type) + mmctx_timer_stop(ctx, 3370); + + switch (mi_type) { + case GSM_MI_TYPE_IMSI: + /* we already have a mm context with current TLLI, but no + * P-TMSI / IMSI yet. What we now need to do is to fill + * this initial context with data from the HLR */ + if (strlen(ctx->imsi) == 0) { + /* Check if we already have a MM context for this IMSI */ + struct sgsn_mm_ctx *ictx; + ictx = sgsn_mm_ctx_by_imsi(mi_string); + if (ictx) { + /* Handle it like in gsm48_rx_gmm_det_req, + * except that no messages are sent to the BSS */ + + LOGMMCTXP(LOGL_NOTICE, ctx, "Deleting old MM Context for same IMSI " + "p_tmsi_old=0x%08x\n", + ictx->p_tmsi); + + mm_ctx_cleanup_free(ictx, "GPRS IMSI re-use"); + } + } + osmo_strlcpy(ctx->imsi, mi_string, sizeof(ctx->imsi)); + break; + case GSM_MI_TYPE_IMEI: + osmo_strlcpy(ctx->imei, mi_string, sizeof(ctx->imei)); + break; + case GSM_MI_TYPE_IMEISV: + break; + } + + /* Check if we can let the mobile station enter */ + return gsm48_gmm_authorize(ctx); +} + +/* Section 9.4.1 Attach request */ +static int gsm48_rx_gmm_att_req(struct sgsn_mm_ctx *ctx, struct msgb *msg, + struct gprs_llc_llme *llme) +{ + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); + uint8_t *cur = gh->data, *msnc, *mi, *ms_ra_acc_cap; + uint8_t msnc_len, att_type, mi_len, mi_type, ms_ra_acc_cap_len; + uint16_t drx_par; + uint32_t tmsi; + char mi_string[GSM48_MI_SIZE]; + struct gprs_ra_id ra_id; + uint16_t cid = 0; + enum gsm48_gmm_cause reject_cause; + int rc; + + LOGMMCTXP(LOGL_INFO, ctx, "-> GMM ATTACH REQUEST "); + rate_ctr_inc(&sgsn->rate_ctrs->ctr[CTR_GPRS_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. */ + + /* In Iu mode, msg->dst contains the ue_conn_ctx pointer, in Gb mode + * dst is empty. */ + /* FIXME: have a more explicit indicator for Iu messages */ + if (!msg->dst) { + /* Gb mode */ + cid = bssgp_parse_cell_id(&ra_id, msgb_bcid(msg)); + } else + ra_id = ((struct ue_conn_ctx*)msg->dst)->ra_id; + + /* MS network capability 10.5.5.12 */ + msnc_len = *cur++; + msnc = cur; + if (msnc_len > sizeof(ctx->ms_network_capa.buf)) + goto err_inval; + cur += msnc_len; + + /* TODO: In iu mode - handle follow-on request */ + + /* aTTACH Type 10.5.5.2 */ + att_type = *cur++ & 0x07; + + /* DRX parameter 10.5.5.6 */ + drx_par = *cur++ << 8; + drx_par |= *cur++; + + /* Mobile Identity (P-TMSI or IMSI) 10.5.1.4 */ + mi_len = *cur++; + mi = cur; + if (mi_len > 8) + goto err_inval; + mi_type = *mi & GSM_MI_TYPE_MASK; + cur += mi_len; + + gsm48_mi_to_string(mi_string, sizeof(mi_string), mi, mi_len); + + DEBUGPC(DMM, "MI(%s) type=\"%s\" ", mi_string, + get_value_string(gprs_att_t_strs, att_type)); + + /* Old routing area identification 10.5.5.15. Skip it */ + cur += 6; + + /* MS Radio Access Capability 10.5.5.12a */ + ms_ra_acc_cap_len = *cur++; + ms_ra_acc_cap = cur; + if (ms_ra_acc_cap_len > sizeof(ctx->ms_radio_access_capa.buf)) + goto err_inval; + cur += ms_ra_acc_cap_len; + + LOGPC(DMM, LOGL_INFO, "\n"); + + /* Optional: Old P-TMSI Signature, Requested READY timer, TMSI Status */ + + switch (mi_type) { + case GSM_MI_TYPE_IMSI: + /* Try to find MM context based on IMSI */ + if (!ctx) + ctx = sgsn_mm_ctx_by_imsi(mi_string); + if (!ctx) { +#if 0 + return gsm48_tx_gmm_att_rej(msg, GMM_CAUSE_IMSI_UNKNOWN); +#else + if (msg->dst) + ctx = sgsn_mm_ctx_alloc_iu(msg->dst); + else + ctx = sgsn_mm_ctx_alloc_gb(0, &ra_id); + if (!ctx) { + reject_cause = GMM_CAUSE_NET_FAIL; + goto rejected; + } + osmo_strlcpy(ctx->imsi, mi_string, sizeof(ctx->imsi)); +#endif + } + if (ctx->ran_type == MM_CTX_T_GERAN_Gb) { + ctx->gb.tlli = msgb_tlli(msg); + ctx->gb.llme = llme; + } + msgid2mmctx(ctx, msg); + break; + case GSM_MI_TYPE_TMSI: + memcpy(&tmsi, mi+1, 4); + tmsi = ntohl(tmsi); + /* Try to find MM context based on P-TMSI */ + if (!ctx) + ctx = sgsn_mm_ctx_by_ptmsi(tmsi); + if (!ctx) { + /* Allocate a context as most of our code expects one. + * Context will not have an IMSI ultil ID RESP is received */ + if (msg->dst) + ctx = sgsn_mm_ctx_alloc_iu(msg->dst); + else + ctx = sgsn_mm_ctx_alloc_gb(msgb_tlli(msg), &ra_id); + ctx->p_tmsi = tmsi; + } + if (ctx->ran_type == MM_CTX_T_GERAN_Gb) { + ctx->gb.tlli = msgb_tlli(msg); + ctx->gb.llme = llme; + } + msgid2mmctx(ctx, msg); + break; + default: + LOGMMCTXP(LOGL_NOTICE, ctx, "Rejecting ATTACH REQUEST with " + "MI type %s\n", gsm48_mi_type_name(mi_type)); + reject_cause = GMM_CAUSE_MS_ID_NOT_DERIVED; + goto rejected; + } + /* Update MM Context with currient RA and Cell ID */ + ctx->ra = ra_id; + if (ctx->ran_type == MM_CTX_T_GERAN_Gb) + ctx->gb.cell_id = cid; + else if (ctx->ran_type == MM_CTX_T_UTRAN_Iu) { + /* DEVELOPMENT HACK: Our current HLR does not support 3G + * authentication tokens. A new HLR/VLR implementation is being + * developed. Until it is ready and actual milenage + * authentication is properly supported, we are hardcoding a + * fixed Ki and use 2G auth. */ + unsigned char tmp_rand[16]; + /* Ki 000102030405060708090a0b0c0d0e0f */ + struct osmo_sub_auth_data auth = { + .type = OSMO_AUTH_TYPE_GSM, + .algo = OSMO_AUTH_ALG_COMP128v1, + .u.gsm.ki = { + 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, + 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, + 0x0e, 0x0f + }, + }; + /* XXX: Hack to make 3G auth work with special SIM card */ + ctx->auth_state = SGSN_AUTH_AUTHENTICATE; + + RAND_bytes(tmp_rand, 16); + + memset(&ctx->auth_triplet.vec, 0, sizeof(ctx->auth_triplet.vec)); + osmo_auth_gen_vec(&ctx->auth_triplet.vec, &auth, tmp_rand); + + ctx->auth_triplet.key_seq = 0; + } + + /* 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); + if (!gprs_ms_net_cap_gea_supported(ctx->ms_network_capa.buf, msnc_len, + ctx->ciph_algo)) { + reject_cause = GMM_CAUSE_PROTO_ERR_UNSPEC; + LOGMMCTXP(LOGL_NOTICE, ctx, "Rejecting ATTACH REQUEST with MI " + "type %s because MS do not support required %s " + "encryption\n", gsm48_mi_type_name(mi_type), + get_value_string(gprs_cipher_names,ctx->ciph_algo)); + goto rejected; + } +#ifdef PTMSI_ALLOC + /* Allocate a new P-TMSI (+ P-TMSI signature) and update TLLI */ + /* Don't change the P-TMSI if a P-TMSI re-assignment is under way */ + if (ctx->gmm_state != GMM_COMMON_PROC_INIT) { + ctx->p_tmsi_old = ctx->p_tmsi; + ctx->p_tmsi = sgsn_alloc_ptmsi(); + } + ctx->gmm_state = GMM_COMMON_PROC_INIT; +#endif + + if (ctx->ran_type == MM_CTX_T_GERAN_Gb) { + /* Even if there is no P-TMSI allocated, the MS will + * switch from foreign TLLI to local TLLI */ + ctx->gb.tlli_new = gprs_tmsi2tlli(ctx->p_tmsi, TLLI_LOCAL); + + /* Inform LLC layer about new TLLI but keep old active */ + if (ctx->is_authenticated) + gprs_llme_copy_key(ctx, ctx->gb.llme); + + gprs_llgmm_assign(ctx->gb.llme, ctx->gb.tlli, ctx->gb.tlli_new); + } + + ctx->pending_req = GSM48_MT_GMM_ATTACH_REQ; + return gsm48_gmm_authorize(ctx); + +err_inval: + LOGPC(DMM, LOGL_INFO, "\n"); + reject_cause = GMM_CAUSE_SEM_INCORR_MSG; + +rejected: + /* Send ATTACH REJECT */ + LOGMMCTXP(LOGL_NOTICE, ctx, + "Rejecting Attach Request with cause '%s' (%d)\n", + get_value_string(gsm48_gmm_cause_names, reject_cause), reject_cause); + rc = gsm48_tx_gmm_att_rej_oldmsg(msg, reject_cause); + if (ctx) + mm_ctx_cleanup_free(ctx, "GPRS ATTACH REJ"); + else + gprs_llgmm_unassign(llme); + + return rc; + +} + +/* Section 4.7.4.1 / 9.4.5.2 MO Detach request */ +static int gsm48_rx_gmm_det_req(struct sgsn_mm_ctx *ctx, struct msgb *msg) +{ + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); + uint8_t detach_type, power_off; + int rc = 0; + + detach_type = gh->data[0] & 0x7; + power_off = gh->data[0] & 0x8; + + /* FIXME: In 24.008 there is an optional P-TMSI and P-TMSI signature IE */ + rate_ctr_inc(&sgsn->rate_ctrs->ctr[CTR_GPRS_DETACH_REQUEST]); + LOGMMCTXP(LOGL_INFO, ctx, "-> GMM DETACH REQUEST TLLI=0x%08x type=%s %s\n", + msgb_tlli(msg), get_value_string(gprs_det_t_mo_strs, detach_type), + power_off ? "Power-off" : ""); + + /* Only send the Detach Accept (MO) if power off isn't indicated, + * see 04.08, 4.7.4.1.2/3 for details */ + if (!power_off) { + /* force_stby = 0 */ + if (ctx) + rc = gsm48_tx_gmm_det_ack(ctx, 0); + else + rc = gsm48_tx_gmm_det_ack_oldmsg(msg, 0); + } + + if (ctx) { + struct sgsn_signal_data sig_data; + memset(&sig_data, 0, sizeof(sig_data)); + sig_data.mm = ctx; + osmo_signal_dispatch(SS_SGSN, S_SGSN_DETACH, &sig_data); + mm_ctx_cleanup_free(ctx, "GPRS DETACH REQUEST"); + } + + return rc; +} + +/* Chapter 9.4.15: Routing area update accept */ +static int gsm48_tx_gmm_ra_upd_ack(struct sgsn_mm_ctx *mm) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 UPD ACK"); + struct gsm48_hdr *gh; + struct gsm48_ra_upd_ack *rua; + uint8_t *mid; + + rate_ctr_inc(&sgsn->rate_ctrs->ctr[CTR_GPRS_ROUTING_AREA_ACKED]); + LOGMMCTXP(LOGL_INFO, mm, "<- ROUTING AREA UPDATE ACCEPT\n"); + + mmctx2msgid(msg, mm); + + gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + gh->proto_discr = GSM48_PDISC_MM_GPRS; + gh->msg_type = GSM48_MT_GMM_RA_UPD_ACK; + + rua = (struct gsm48_ra_upd_ack *) msgb_put(msg, sizeof(*rua)); + rua->force_stby = 0; /* not indicated */ + rua->upd_result = 0; /* RA updated */ + rua->ra_upd_timer = gprs_secs_to_tmr_floor(sgsn->cfg.timers.T3312); + + gsm48_construct_ra(rua->ra_id.digits, &mm->ra); + +#if 0 + /* Optional: P-TMSI signature */ + msgb_v_put(msg, GSM48_IE_GMM_PTMSI_SIG); + ptsig = msgb_put(msg, 3); + ptsig[0] = mm->p_tmsi_sig >> 16; + ptsig[1] = mm->p_tmsi_sig >> 8; + ptsig[2] = mm->p_tmsi_sig & 0xff; +#endif + +#ifdef PTMSI_ALLOC + /* Optional: Allocated P-TMSI */ + mid = msgb_put(msg, GSM48_MID_TMSI_LEN); + gsm48_generate_mid_from_tmsi(mid, mm->p_tmsi); + mid[0] = GSM48_IE_GMM_ALLOC_PTMSI; +#endif + + /* Optional: Negotiated READY timer value */ + msgb_tv_put(msg, GSM48_IE_GMM_TIMER_READY, + gprs_secs_to_tmr_floor(sgsn->cfg.timers.T3314)); + + /* Option: MS ID, ... */ + return gsm48_gmm_sendmsg(msg, 0, mm, true); +} + +/* Chapter 9.4.17: Routing area update reject */ +static int gsm48_tx_gmm_ra_upd_rej(struct msgb *old_msg, uint8_t cause) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 RA UPD REJ"); + struct gsm48_hdr *gh; + + LOGP(DMM, LOGL_NOTICE, "<- ROUTING AREA UPDATE REJECT\n"); + rate_ctr_inc(&sgsn->rate_ctrs->ctr[CTR_GPRS_ROUTING_AREA_REJECT]); + + 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, false); +} + +static void process_ms_ctx_status(struct sgsn_mm_ctx *mmctx, + const uint8_t *pdp_status) +{ + struct sgsn_pdp_ctx *pdp, *pdp2; + /* 24.008 4.7.5.1.3: If the PDP context status information element is + * included in ROUTING AREA UPDATE REQUEST message, then the network + * shall deactivate all those PDP contexts locally (without peer to + * peer signalling between the MS and the network), which are not in SM + * state PDP-INACTIVE on network side but are indicated by the MS as + * being in state PDP-INACTIVE. */ + + llist_for_each_entry_safe(pdp, pdp2, &mmctx->pdp_list, list) { + if (pdp->nsapi < 8) { + if (!(pdp_status[0] & (1 << pdp->nsapi))) { + LOGMMCTXP(LOGL_NOTICE, mmctx, "Dropping PDP context for NSAPI=%u " + "due to PDP CTX STATUS IE= 0x%02x%02x\n", + pdp->nsapi, pdp_status[1], pdp_status[0]); + sgsn_delete_pdp_ctx(pdp); + } + } else { + if (!(pdp_status[1] & (1 << (pdp->nsapi - 8)))) { + LOGMMCTXP(LOGL_NOTICE, mmctx, "Dropping PDP context for NSAPI=%u " + "due to PDP CTX STATUS IE= 0x%02x%02x\n", + pdp->nsapi, pdp_status[1], pdp_status[0]); + sgsn_delete_pdp_ctx(pdp); + } + } + } +} + +/* Chapter 9.4.14: Routing area update request */ +static int gsm48_rx_gmm_ra_upd_req(struct sgsn_mm_ctx *mmctx, struct msgb *msg, + struct gprs_llc_llme *llme) +{ +#ifndef PTMSI_ALLOC + struct sgsn_signal_data sig_data; +#endif + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); + uint8_t *cur = gh->data; + uint8_t ms_ra_acc_cap_len; + struct gprs_ra_id old_ra_id; + struct tlv_parsed tp; + uint8_t upd_type; + enum gsm48_gmm_cause reject_cause = GMM_CAUSE_PROTO_ERR_UNSPEC; + int rc; + + /* TODO: In iu mode - handle follow-on request */ + + /* Update Type 10.5.5.18 */ + upd_type = *cur++ & 0x07; + + rate_ctr_inc(&sgsn->rate_ctrs->ctr[CTR_GPRS_ROUTING_AREA_REQUEST]); + LOGP(DMM, LOGL_INFO, "-> GMM RA UPDATE REQUEST type=\"%s\"\n", + get_value_string(gprs_upd_t_strs, upd_type)); + + /* Old routing area identification 10.5.5.15 */ + gsm48_parse_ra(&old_ra_id, cur); + cur += 6; + + /* MS Radio Access Capability 10.5.5.12a */ + ms_ra_acc_cap_len = *cur++; + if (ms_ra_acc_cap_len > 52) { + reject_cause = GMM_CAUSE_PROTO_ERR_UNSPEC; + goto rejected; + } + cur += ms_ra_acc_cap_len; + + /* Optional: Old P-TMSI Signature, Requested READY timer, TMSI Status, + * DRX parameter, MS network capability */ + tlv_parse(&tp, &gsm48_gmm_att_tlvdef, cur, + (msg->data + msg->len) - cur, 0, 0); + + switch (upd_type) { + case GPRS_UPD_T_RA_LA: + case GPRS_UPD_T_RA_LA_IMSI_ATT: + LOGP(DMM, LOGL_NOTICE, "Update type %i unsupported in Mode III, is your SI13 corrupt?\n", upd_type); + reject_cause = GMM_CAUSE_PROTO_ERR_UNSPEC; + goto rejected; + case GPRS_UPD_T_RA: + case GPRS_UPD_T_PERIODIC: + break; + } + + if (!mmctx) { + /* BSSGP doesn't give us an mmctx */ + + /* TODO: Check if there is an MM CTX with old_ra_id and + * the P-TMSI (if given, reguired for UMTS) or as last resort + * if the TLLI matches foreign_tlli (P-TMSI). Note that this + * is an optimization to avoid the RA reject (impl detached) + * below, which will cause a new attach cycle. */ + /* Look-up the MM context based on old RA-ID and TLLI */ + /* In Iu mode, msg->dst contains the ue_conn_ctx pointer, in Gb + * mode dst is empty. */ + /* FIXME: have a more explicit indicator for Iu messages */ + if (!msg->dst) { + mmctx = sgsn_mm_ctx_by_tlli_and_ptmsi(msgb_tlli(msg), &old_ra_id); + } else if (TLVP_PRESENT(&tp, GSM48_IE_GMM_ALLOC_PTMSI)) { +#ifdef BUILD_IU + /* In Iu mode search only for ptmsi */ + char mi_string[GSM48_MI_SIZE]; + uint8_t mi_len = TLVP_LEN(&tp, GSM48_IE_GMM_ALLOC_PTMSI); + uint8_t *mi = TLVP_VAL(&tp, GSM48_IE_GMM_ALLOC_PTMSI); + uint8_t mi_type = *mi & GSM_MI_TYPE_MASK; + uint32_t tmsi; + + gsm48_mi_to_string(mi_string, sizeof(mi_string), mi, mi_len); + + if (mi_type == GSM_MI_TYPE_TMSI) { + memcpy(&tmsi, mi+1, 4); + tmsi = ntohl(tmsi); + mmctx = sgsn_mm_ctx_by_ptmsi(tmsi); + } +#else + goto rejected; +#endif + } + if (mmctx) { + LOGMMCTXP(LOGL_INFO, mmctx, + "Looked up by matching TLLI and P_TMSI. " + "BSSGP TLLI: %08x, P-TMSI: %08x (%08x), " + "TLLI: %08x (%08x), RA: %d-%d-%d-%d\n", + msgb_tlli(msg), + mmctx->p_tmsi, mmctx->p_tmsi_old, + mmctx->gb.tlli, mmctx->gb.tlli_new, + mmctx->ra.mcc, mmctx->ra.mnc, + mmctx->ra.lac, mmctx->ra.rac); + + mmctx->gmm_state = GMM_COMMON_PROC_INIT; + } + } else if (!gprs_ra_id_equals(&mmctx->ra, &old_ra_id) || + mmctx->gmm_state == GMM_DEREGISTERED) + { + /* We cannot use the mmctx */ + LOGMMCTXP(LOGL_INFO, mmctx, + "The MM context cannot be used, RA: %d-%d-%d-%d\n", + mmctx->ra.mcc, mmctx->ra.mnc, + mmctx->ra.lac, mmctx->ra.rac); + mmctx = NULL; + } + + if (!mmctx) { + if (llme) { + /* send a XID reset to re-set all LLC sequence numbers + * in the MS */ + LOGMMCTXP(LOGL_NOTICE, mmctx, "LLC XID RESET\n"); + gprs_llgmm_reset(llme); + } + /* The MS has to perform GPRS attach */ + /* Device is still IMSI attached for CS but initiate GPRS ATTACH, + * see GSM 04.08, 4.7.5.1.4 and G.6 */ + reject_cause = GMM_CAUSE_IMPL_DETACHED; + goto rejected; + } + + /* Store new BVCI/NSEI in MM context (FIXME: delay until we ack?) */ + msgid2mmctx(mmctx, msg); + /* Bump the statistics of received signalling msgs for this MM context */ + rate_ctr_inc(&mmctx->ctrg->ctr[GMM_CTR_PKTS_SIG_IN]); + + /* Update the MM context with the new RA-ID */ + if (mmctx->ran_type == MM_CTX_T_GERAN_Gb) { + bssgp_parse_cell_id(&mmctx->ra, msgb_bcid(msg)); + /* Update the MM context with the new (i.e. foreign) TLLI */ + mmctx->gb.tlli = msgb_tlli(msg); + } + /* FIXME: Update the MM context with the MS radio acc capabilities */ + /* FIXME: Update the MM context with the MS network capabilities */ + + rate_ctr_inc(&mmctx->ctrg->ctr[GMM_CTR_RA_UPDATE]); + +#ifdef PTMSI_ALLOC + /* Don't change the P-TMSI if a P-TMSI re-assignment is under way */ + if (mmctx->gmm_state != GMM_COMMON_PROC_INIT) { + mmctx->p_tmsi_old = mmctx->p_tmsi; + mmctx->p_tmsi = sgsn_alloc_ptmsi(); + } + /* Start T3350 and re-transmit up to 5 times until ATTACH COMPLETE */ + mmctx->t3350_mode = GMM_T3350_MODE_RAU; + mmctx_timer_start(mmctx, 3350, sgsn->cfg.timers.T3350); + + mmctx->gmm_state = GMM_COMMON_PROC_INIT; +#else + /* Make sure we are NORMAL (i.e. not SUSPENDED anymore) */ + mmctx->gmm_state = GMM_REGISTERED_NORMAL; + + memset(&sig_data, 0, sizeof(sig_data)); + sig_data.mm = mmctx; + osmo_signal_dispatch(SS_SGSN, S_SGSN_UPDATE, &sig_data); +#endif + if (mmctx->ran_type == MM_CTX_T_GERAN_Gb) { + /* Even if there is no P-TMSI allocated, the MS will switch from + * foreign TLLI to local TLLI */ + mmctx->gb.tlli_new = gprs_tmsi2tlli(mmctx->p_tmsi, TLLI_LOCAL); + + /* Inform LLC layer about new TLLI but keep old active */ + gprs_llgmm_assign(mmctx->gb.llme, mmctx->gb.tlli, + mmctx->gb.tlli_new); + } + + /* 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); + } + + /* Send RA UPDATE ACCEPT. In Iu, the RA upd request can be called from + * a new Iu connection, so we might need to re-authenticate the + * connection as well as turn on integrity protection. */ + mmctx->pending_req = GSM48_MT_GMM_RA_UPD_REQ; + return gsm48_gmm_authorize(mmctx); + +rejected: + /* Send RA UPDATE REJECT */ + LOGMMCTXP(LOGL_NOTICE, mmctx, + "Rejecting RA Update Request with cause '%s' (%d)\n", + get_value_string(gsm48_gmm_cause_names, reject_cause), reject_cause); + rc = gsm48_tx_gmm_ra_upd_rej(msg, reject_cause); + if (mmctx) + mm_ctx_cleanup_free(mmctx, "GPRS RA UPDATE REJ"); + else { + if (llme) + gprs_llgmm_unassign(llme); + } + + return rc; +} + +/* 3GPP TS 24.008 Section 9.4.20 Service request. + * In Iu, a UE in PMM-IDLE mode can use GSM48_MT_GMM_SERVICE_REQ to switch back + * to PMM-CONNECTED mode. */ +static int gsm48_rx_gmm_service_req(struct sgsn_mm_ctx *ctx, struct msgb *msg) +{ + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); + uint8_t *cur = gh->data, *mi; + uint8_t ciph_seq_nr, service_type, mi_len, mi_type; + uint32_t tmsi; + struct tlv_parsed tp; + char mi_string[GSM48_MI_SIZE]; + enum gsm48_gmm_cause reject_cause; + int rc; + + LOGMMCTXP(LOGL_INFO, ctx, "-> GMM SERVICE REQUEST "); + + /* This message is only valid in Iu mode */ + if (!msg->dst) { + LOGPC(DMM, LOGL_INFO, "Invalid if not in Iu mode\n"); + return -1; + } + + /* Skip Ciphering key sequence number 10.5.1.2 */ + ciph_seq_nr = *cur & 0x07; + + /* Service type 10.5.5.20 */ + service_type = (*cur++ >> 4) & 0x07; + + /* Mobile Identity (P-TMSI or IMSI) 10.5.1.4 */ + mi_len = *cur++; + mi = cur; + if (mi_len > 8) + goto err_inval; + mi_type = *mi & GSM_MI_TYPE_MASK; + cur += mi_len; + + gsm48_mi_to_string(mi_string, sizeof(mi_string), mi, mi_len); + + DEBUGPC(DMM, "MI(%s) type=\"%s\" ", mi_string, + get_value_string(gprs_service_t_strs, service_type)); + + LOGPC(DMM, LOGL_INFO, "\n"); + + /* Optional: PDP context status, MBMS context status, Uplink data status, Device properties */ + tlv_parse(&tp, &gsm48_gmm_att_tlvdef, cur, (msg->data + msg->len) - cur, 0, 0); + + switch (mi_type) { + case GSM_MI_TYPE_IMSI: + /* Try to find MM context based on IMSI */ + if (!ctx) + ctx = sgsn_mm_ctx_by_imsi(mi_string); + if (!ctx) { + /* FIXME: We need to have a context for service request? */ + reject_cause = GMM_CAUSE_NET_FAIL; + goto rejected; + } + msgid2mmctx(ctx, msg); + break; + case GSM_MI_TYPE_TMSI: + memcpy(&tmsi, mi+1, 4); + tmsi = ntohl(tmsi); + /* Try to find MM context based on P-TMSI */ + if (!ctx) + ctx = sgsn_mm_ctx_by_ptmsi(tmsi); + if (!ctx) { + /* FIXME: We need to have a context for service request? */ + reject_cause = GMM_CAUSE_NET_FAIL; + goto rejected; + } + msgid2mmctx(ctx, msg); + break; + default: + LOGMMCTXP(LOGL_NOTICE, ctx, "Rejecting SERVICE REQUEST with " + "MI type %s\n", gsm48_mi_type_name(mi_type)); + reject_cause = GMM_CAUSE_MS_ID_NOT_DERIVED; + goto rejected; + } + + ctx->gmm_state = GMM_COMMON_PROC_INIT; + + ctx->iu.service.type = service_type; + + /* TODO: Handle those only in case of accept? */ + /* Look at PDP Context Status IE and see if MS's view of + * activated/deactivated NSAPIs agrees with our view */ + if (TLVP_PRESENT(&tp, GSM48_IE_GMM_PDP_CTX_STATUS)) { + const uint8_t *pdp_status = TLVP_VAL(&tp, GSM48_IE_GMM_PDP_CTX_STATUS); + process_ms_ctx_status(ctx, pdp_status); + } + + + ctx->pending_req = GSM48_MT_GMM_SERVICE_REQ; + return gsm48_gmm_authorize(ctx); + +err_inval: + LOGPC(DMM, LOGL_INFO, "\n"); + reject_cause = GMM_CAUSE_SEM_INCORR_MSG; + +rejected: + /* Send SERVICE REJECT */ + LOGMMCTXP(LOGL_NOTICE, ctx, + "Rejecting Service Request with cause '%s' (%d)\n", + get_value_string(gsm48_gmm_cause_names, reject_cause), reject_cause); + rc = gsm48_tx_gmm_service_rej_oldmsg(msg, reject_cause); + + return rc; + +} + + +static int gsm48_rx_gmm_status(struct sgsn_mm_ctx *mmctx, struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + + LOGMMCTXP(LOGL_INFO, mmctx, "-> GPRS MM STATUS (cause: %s)\n", + get_value_string(gsm48_gmm_cause_names, gh->data[0])); + + return 0; +} + +/* GPRS Mobility Management */ +static int gsm0408_rcv_gmm(struct sgsn_mm_ctx *mmctx, struct msgb *msg, + struct gprs_llc_llme *llme, bool drop_cipherable) +{ + struct sgsn_signal_data sig_data; + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); + int rc; + + /* MMCTX can be NULL when called */ + if (drop_cipherable && gsm48_hdr_gmm_cipherable(gh)) { + LOGMMCTXP(LOGL_NOTICE, mmctx, "Dropping cleartext GMM %s which " + "is expected to be encrypted for TLLI 0x%08x\n", + get_value_string(gprs_msgt_gmm_names, gh->msg_type), + llme->tlli); + return -EBADMSG; + } + + if (llme && !mmctx && + gh->msg_type != GSM48_MT_GMM_ATTACH_REQ && + gh->msg_type != GSM48_MT_GMM_RA_UPD_REQ) { + LOGP(DMM, LOGL_NOTICE, "Cannot handle GMM for unknown MM CTX\n"); + /* 4.7.10 */ + if (gh->msg_type == GSM48_MT_GMM_STATUS) { + /* TLLI unassignment */ + gprs_llgmm_unassign(llme); + return 0; + } + + /* Don't reply or establish a LLME on DETACH_ACK */ + if (gh->msg_type == GSM48_MT_GMM_DETACH_ACK) + return gprs_llgmm_unassign(llme); + + gprs_llgmm_reset(llme); + + /* Don't force it into re-attachment */ + if (gh->msg_type == GSM48_MT_GMM_DETACH_REQ) { + /* Handle Detach Request */ + rc = gsm48_rx_gmm_det_req(NULL, msg); + + /* TLLI unassignment */ + gprs_llgmm_unassign(llme); + return rc; + } + + /* Force the MS to re-attach */ + rc = gsm0408_gprs_force_reattach_oldmsg(msg, llme); + + /* TLLI unassignment */ + gprs_llgmm_unassign(llme); + return rc; + } + + /* + * For a few messages, mmctx may be NULL. For most, we want to ensure a + * non-NULL mmctx. At the same time, we want to keep the message + * validity check intact, so that all message types appear in the + * switch statement and the default case thus means "unknown message". + * If we split the switch in two parts to check non-NULL halfway, the + * unknown-message check breaks, or we'd need to duplicate the switch + * cases in both parts. Just keep one large switch and add some gotos. + */ + switch (gh->msg_type) { + case GSM48_MT_GMM_RA_UPD_REQ: + rc = gsm48_rx_gmm_ra_upd_req(mmctx, msg, llme); + break; + case GSM48_MT_GMM_ATTACH_REQ: + rc = gsm48_rx_gmm_att_req(mmctx, msg, llme); + break; + case GSM48_MT_GMM_SERVICE_REQ: + rc = gsm48_rx_gmm_service_req(mmctx, msg); + break; + /* For all the following types mmctx can not be NULL */ + case GSM48_MT_GMM_ID_RESP: + if (!mmctx) + goto null_mmctx; + rc = gsm48_rx_gmm_id_resp(mmctx, msg); + break; + case GSM48_MT_GMM_STATUS: + if (!mmctx) + goto null_mmctx; + rc = gsm48_rx_gmm_status(mmctx, msg); + break; + case GSM48_MT_GMM_DETACH_REQ: + if (!mmctx) + goto null_mmctx; + rc = gsm48_rx_gmm_det_req(mmctx, msg); + break; + case GSM48_MT_GMM_DETACH_ACK: + if (!mmctx) + goto null_mmctx; + LOGMMCTXP(LOGL_INFO, mmctx, "-> DETACH ACK\n"); + mm_ctx_cleanup_free(mmctx, "GPRS DETACH ACK"); + rc = 0; + break; + case GSM48_MT_GMM_ATTACH_COMPL: + if (!mmctx) + goto null_mmctx; + /* only in case SGSN offered new P-TMSI */ + LOGMMCTXP(LOGL_INFO, mmctx, "-> ATTACH COMPLETE\n"); + mmctx_timer_stop(mmctx, 3350); + mmctx->t3350_mode = GMM_T3350_MODE_NONE; + mmctx->p_tmsi_old = 0; + mmctx->pending_req = 0; + if (mmctx->ran_type == MM_CTX_T_GERAN_Gb) { + /* Unassign the old TLLI */ + mmctx->gb.tlli = mmctx->gb.tlli_new; + gprs_llme_copy_key(mmctx, mmctx->gb.llme); + gprs_llgmm_assign(mmctx->gb.llme, 0xffffffff, + mmctx->gb.tlli_new); + } + mmctx->gmm_state = GMM_REGISTERED_NORMAL; + mmctx_set_pmm_state(mmctx, PMM_CONNECTED); + mmctx_set_mm_state(mmctx, MM_READY); + rc = 0; + + memset(&sig_data, 0, sizeof(sig_data)); + sig_data.mm = mmctx; + osmo_signal_dispatch(SS_SGSN, S_SGSN_ATTACH, &sig_data); + break; + case GSM48_MT_GMM_RA_UPD_COMPL: + if (!mmctx) + goto null_mmctx; + /* only in case SGSN offered new P-TMSI */ + LOGMMCTXP(LOGL_INFO, mmctx, "-> ROUTING AREA UPDATE COMPLETE\n"); + mmctx_timer_stop(mmctx, 3350); + mmctx->t3350_mode = GMM_T3350_MODE_NONE; + mmctx->p_tmsi_old = 0; + mmctx->pending_req = 0; + if (mmctx->ran_type == MM_CTX_T_GERAN_Gb) { + /* Unassign the old TLLI */ + mmctx->gb.tlli = mmctx->gb.tlli_new; + gprs_llgmm_assign(mmctx->gb.llme, 0xffffffff, + mmctx->gb.tlli_new); + } + mmctx->gmm_state = GMM_REGISTERED_NORMAL; + mmctx_set_pmm_state(mmctx, PMM_CONNECTED); + mmctx_set_mm_state(mmctx, MM_READY); + rc = 0; + + memset(&sig_data, 0, sizeof(sig_data)); + sig_data.mm = mmctx; + osmo_signal_dispatch(SS_SGSN, S_SGSN_UPDATE, &sig_data); + break; + case GSM48_MT_GMM_PTMSI_REALL_COMPL: + if (!mmctx) + goto null_mmctx; + LOGMMCTXP(LOGL_INFO, mmctx, "-> PTMSI REALLLICATION COMPLETE\n"); + mmctx_timer_stop(mmctx, 3350); + mmctx->t3350_mode = GMM_T3350_MODE_NONE; + mmctx->p_tmsi_old = 0; + mmctx->pending_req = 0; + if (mmctx->ran_type == MM_CTX_T_GERAN_Gb) { + /* Unassign the old TLLI */ + mmctx->gb.tlli = mmctx->gb.tlli_new; + //gprs_llgmm_assign(mmctx->gb.llme, 0xffffffff, mmctx->gb.tlli_new, GPRS_ALGO_GEA0, NULL); + } + rc = 0; + break; + case GSM48_MT_GMM_AUTH_CIPH_RESP: + if (!mmctx) + goto null_mmctx; + rc = gsm48_rx_gmm_auth_ciph_resp(mmctx, msg); + break; + case GSM48_MT_GMM_AUTH_CIPH_FAIL: + rc = gsm48_rx_gmm_auth_ciph_fail(mmctx, msg); + break; + default: + LOGMMCTXP(LOGL_NOTICE, mmctx, "Unknown GSM 04.08 GMM msg type 0x%02x\n", + gh->msg_type); + if (mmctx) + rc = gsm48_tx_gmm_status(mmctx, GMM_CAUSE_MSGT_NOTEXIST_NOTIMPL); + else + rc = -EINVAL; + break; + } + + return rc; + +null_mmctx: + LOGP(DMM, LOGL_ERROR, + "Received GSM 04.08 message type 0x%02x," + " but no MM context available\n", + gh->msg_type); + return -EINVAL; +} + +static void mmctx_timer_cb(void *_mm) +{ + struct sgsn_mm_ctx *mm = _mm; + struct gsm_auth_tuple *at; + + mm->num_T_exp++; + + switch (mm->T) { + case 3350: /* waiting for ATTACH COMPLETE */ + if (mm->num_T_exp >= 5) { + LOGMMCTXP(LOGL_NOTICE, mm, "T3350 expired >= 5 times\n"); + mm_ctx_cleanup_free(mm, "T3350"); + /* FIXME: should we return some error? */ + break; + } + /* re-transmit the respective msg and re-start timer */ + switch (mm->t3350_mode) { + case GMM_T3350_MODE_ATT: + gsm48_tx_gmm_att_ack(mm); + break; + case GMM_T3350_MODE_RAU: + gsm48_tx_gmm_ra_upd_ack(mm); + break; + case GMM_T3350_MODE_PTMSI_REALL: + /* FIXME */ + break; + case GMM_T3350_MODE_NONE: + LOGMMCTXP(LOGL_NOTICE, mm, + "T3350 mode wasn't set, ignoring timeout\n"); + break; + } + osmo_timer_schedule(&mm->timer, sgsn->cfg.timers.T3350, 0); + break; + case 3360: /* waiting for AUTH AND CIPH RESP */ + if (mm->num_T_exp >= 5) { + LOGMMCTXP(LOGL_NOTICE, mm, "T3360 expired >= 5 times\n"); + mm_ctx_cleanup_free(mm, "T3360"); + break; + } + /* Re-transmit the respective msg and re-start timer */ + if (mm->auth_triplet.key_seq == GSM_KEY_SEQ_INVAL) { + LOGMMCTXP(LOGL_ERROR, mm, + "timeout: invalid auth triplet reference\n"); + mm_ctx_cleanup_free(mm, "T3360"); + break; + } + at = &mm->auth_triplet; + + gsm48_tx_gmm_auth_ciph_req(mm, &at->vec, at->key_seq, false); + osmo_timer_schedule(&mm->timer, sgsn->cfg.timers.T3360, 0); + break; + case 3370: /* waiting for IDENTITY RESPONSE */ + if (mm->num_T_exp >= 5) { + LOGMMCTXP(LOGL_NOTICE, mm, "T3370 expired >= 5 times\n"); + gsm48_tx_gmm_att_rej(mm, GMM_CAUSE_MS_ID_NOT_DERIVED); + mm_ctx_cleanup_free(mm, "GPRS ATTACH REJECT (T3370)"); + break; + } + /* re-tranmit IDENTITY REQUEST and re-start timer */ + gsm48_tx_gmm_id_req(mm, mm->t3370_id_type); + osmo_timer_schedule(&mm->timer, sgsn->cfg.timers.T3370, 0); + break; + default: + LOGMMCTXP(LOGL_ERROR, mm, "timer expired in unknown mode %u\n", + mm->T); + } +} + +/* GPRS SESSION MANAGEMENT */ + +static void pdpctx_timer_cb(void *_mm); + +static void pdpctx_timer_start(struct sgsn_pdp_ctx *pdp, unsigned int T, + unsigned int seconds) +{ + if (osmo_timer_pending(&pdp->timer)) + LOGPDPCTXP(LOGL_ERROR, pdp, "Starting PDP 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 ? */ + osmo_timer_setup(&pdp->timer, pdpctx_timer_cb, pdp); + osmo_timer_schedule(&pdp->timer, seconds, 0); +} + +static void pdpctx_timer_stop(struct sgsn_pdp_ctx *pdp, unsigned int T) +{ + if (pdp->T != T) + LOGPDPCTXP(LOGL_ERROR, pdp, "Stopping PDP timer %u but " + "%u is running\n", T, pdp->T); + osmo_timer_del(&pdp->timer); +} + +#if 0 +static void msgb_put_pdp_addr_ipv4(struct msgb *msg, uint32_t ipaddr) +{ + uint8_t v[6]; + + v[0] = PDP_TYPE_ORG_IETF; + v[1] = PDP_TYPE_N_IETF_IPv4; + *(uint32_t *)(v+2) = htonl(ipaddr); + + msgb_tlv_put(msg, GSM48_IE_GSM_PDP_ADDR, sizeof(v), v); +} + +static void msgb_put_pdp_addr_ppp(struct msgb *msg) +{ + uint8_t v[2]; + + v[0] = PDP_TYPE_ORG_ETSI; + v[1] = PDP_TYPE_N_ETSI_PPP; + + msgb_tlv_put(msg, GSM48_IE_GSM_PDP_ADDR, sizeof(v), v); +} +#endif + +/* Section 9.5.2: Activate PDP Context Accept */ +int gsm48_tx_gsm_act_pdp_acc(struct sgsn_pdp_ctx *pdp) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 PDP ACC"); + struct gsm48_hdr *gh; + uint8_t transaction_id = pdp->ti ^ 0x8; /* flip */ + + LOGPDPCTXP(LOGL_INFO, pdp, "<- ACTIVATE PDP CONTEXT ACK\n"); + rate_ctr_inc(&sgsn->rate_ctrs->ctr[CTR_PDP_ACTIVATE_ACCEPT]); + + mmctx2msgid(msg, pdp->mm); + + gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + gh->proto_discr = GSM48_PDISC_SM_GPRS | (transaction_id << 4); + gh->msg_type = GSM48_MT_GSM_ACT_PDP_ACK; + + /* Negotiated LLC SAPI */ + msgb_v_put(msg, pdp->sapi); + + /* FIXME: copy QoS parameters from original request */ + //msgb_lv_put(msg, pdp->lib->qos_neg.l, pdp->lib->qos_neg.v); + msgb_lv_put(msg, sizeof(default_qos), (uint8_t *)&default_qos); + + /* Radio priority 10.5.7.2 */ + msgb_v_put(msg, pdp->lib->radio_pri); + + /* PDP address */ + /* Highest 4 bits of first byte need to be set to 1, otherwise + * the IE is identical with the 04.08 PDP Address IE */ + pdp->lib->eua.v[0] &= ~0xf0; + msgb_tlv_put(msg, GSM48_IE_GSM_PDP_ADDR, + pdp->lib->eua.l, pdp->lib->eua.v); + pdp->lib->eua.v[0] |= 0xf0; + + /* Optional: Protocol configuration options (FIXME: why 'req') */ + if (pdp->lib->pco_req.l) + msgb_tlv_put(msg, GSM48_IE_GSM_PROTO_CONF_OPT, + pdp->lib->pco_req.l, pdp->lib->pco_req.v); + + /* Optional: Packet Flow Identifier */ + + return gsm48_gmm_sendmsg(msg, 0, pdp->mm, true); +} + +/* Section 9.5.3: Activate PDP Context reject */ +int gsm48_tx_gsm_act_pdp_rej(struct sgsn_mm_ctx *mm, uint8_t tid, + uint8_t cause, uint8_t pco_len, uint8_t *pco_v) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 PDP REJ"); + struct gsm48_hdr *gh; + uint8_t transaction_id = tid ^ 0x8; /* flip */ + + LOGMMCTXP(LOGL_NOTICE, mm, "<- ACTIVATE PDP CONTEXT REJ(cause=%u)\n", cause); + rate_ctr_inc(&sgsn->rate_ctrs->ctr[CTR_PDP_ACTIVATE_REJECT]); + + 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, true); +} + +/* Section 9.5.8: Deactivate PDP Context Request */ +static int _gsm48_tx_gsm_deact_pdp_req(struct sgsn_mm_ctx *mm, uint8_t tid, + uint8_t sm_cause) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 PDP DET REQ"); + struct gsm48_hdr *gh; + uint8_t transaction_id = tid ^ 0x8; /* flip */ + + LOGMMCTXP(LOGL_INFO, mm, "<- DEACTIVATE PDP CONTEXT REQ\n"); + rate_ctr_inc(&sgsn->rate_ctrs->ctr[CTR_PDP_DL_DEACTIVATE_REQUEST]); + + 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, true); +} +int gsm48_tx_gsm_deact_pdp_req(struct sgsn_pdp_ctx *pdp, uint8_t sm_cause) +{ + pdpctx_timer_start(pdp, 3395, sgsn->cfg.timers.T3395); + + return _gsm48_tx_gsm_deact_pdp_req(pdp->mm, pdp->ti, sm_cause); +} + +/* Section 9.5.9: Deactivate PDP Context Accept */ +static int _gsm48_tx_gsm_deact_pdp_acc(struct sgsn_mm_ctx *mm, uint8_t tid) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 PDP DET ACC"); + struct gsm48_hdr *gh; + uint8_t transaction_id = tid ^ 0x8; /* flip */ + + LOGMMCTXP(LOGL_INFO, mm, "<- DEACTIVATE PDP CONTEXT ACK\n"); + rate_ctr_inc(&sgsn->rate_ctrs->ctr[CTR_PDP_DL_DEACTIVATE_ACCEPT]); + + 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, true); +} +int gsm48_tx_gsm_deact_pdp_acc(struct sgsn_pdp_ctx *pdp) +{ + return _gsm48_tx_gsm_deact_pdp_acc(pdp->mm, pdp->ti); +} + +static int activate_ggsn(struct sgsn_mm_ctx *mmctx, + struct sgsn_ggsn_ctx *ggsn, const uint8_t transaction_id, + const uint8_t req_nsapi, const uint8_t req_llc_sapi, + struct tlv_parsed *tp, int destroy_ggsn) +{ + struct sgsn_pdp_ctx *pdp; + + LOGMMCTXP(LOGL_DEBUG, mmctx, "Using GGSN %u\n", ggsn->id); + ggsn->gsn = sgsn->gsn; + pdp = sgsn_create_pdp_ctx(ggsn, mmctx, req_nsapi, tp); + if (!pdp) + return -1; + + /* Store SAPI and Transaction Identifier */ + pdp->sapi = req_llc_sapi; + pdp->ti = transaction_id; + pdp->destroy_ggsn = destroy_ggsn; + + return 0; +} + +static void ggsn_lookup_cb(void *arg, int status, int timeouts, struct hostent *hostent) +{ + struct sgsn_ggsn_ctx *ggsn; + struct sgsn_ggsn_lookup *lookup = arg; + struct in_addr *addr = NULL; + + /* The context is gone while we made a request */ + if (!lookup->mmctx) { + talloc_free(lookup->orig_msg); + talloc_free(lookup); + return; + } + + if (status != ARES_SUCCESS) { + struct sgsn_mm_ctx *mmctx = lookup->mmctx; + + LOGMMCTXP(LOGL_ERROR, mmctx, "DNS query failed.\n"); + + /* Need to try with three digits now */ + if (lookup->state == SGSN_GGSN_2DIGIT) { + char *hostname; + int rc; + + lookup->state = SGSN_GGSN_3DIGIT; + hostname = osmo_apn_qualify_from_imsi(mmctx->imsi, + lookup->apn_str, 1); + LOGMMCTXP(LOGL_DEBUG, mmctx, + "Going to query %s\n", hostname); + rc = sgsn_ares_query(sgsn, hostname, + ggsn_lookup_cb, lookup); + if (rc != 0) { + LOGMMCTXP(LOGL_ERROR, mmctx, "Couldn't start GGSN\n"); + goto reject_due_failure; + } + return; + } + + LOGMMCTXP(LOGL_ERROR, mmctx, "Couldn't resolve GGSN\n"); + goto reject_due_failure; + } + + if (hostent->h_length != sizeof(struct in_addr)) { + LOGMMCTXP(LOGL_ERROR, lookup->mmctx, + "Wrong addr size(%zu)\n", sizeof(struct in_addr)); + goto reject_due_failure; + } + + /* Get the first addr from the list */ + addr = (struct in_addr *) hostent->h_addr_list[0]; + if (!addr) { + LOGMMCTXP(LOGL_ERROR, lookup->mmctx, "No host address.\n"); + goto reject_due_failure; + } + + ggsn = sgsn_ggsn_ctx_alloc(UINT32_MAX); + if (!ggsn) { + LOGMMCTXP(LOGL_ERROR, lookup->mmctx, "Failed to create ggsn.\n"); + goto reject_due_failure; + } + ggsn->remote_addr = *addr; + LOGMMCTXP(LOGL_NOTICE, lookup->mmctx, + "Selected %s as GGSN.\n", inet_ntoa(*addr)); + + /* forget about the ggsn look-up */ + lookup->mmctx->ggsn_lookup = NULL; + + activate_ggsn(lookup->mmctx, ggsn, lookup->ti, lookup->nsapi, + lookup->sapi, &lookup->tp, 1); + + /* Now free it */ + talloc_free(lookup->orig_msg); + talloc_free(lookup); + return; + +reject_due_failure: + gsm48_tx_gsm_act_pdp_rej(lookup->mmctx, lookup->ti, + GMM_CAUSE_NET_FAIL, 0, NULL); + lookup->mmctx->ggsn_lookup = NULL; + talloc_free(lookup->orig_msg); + talloc_free(lookup); +} + +static int do_act_pdp_req(struct sgsn_mm_ctx *mmctx, struct msgb *msg, bool *delete) +{ + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); + struct gsm48_act_pdp_ctx_req *act_req = (struct gsm48_act_pdp_ctx_req *) gh->data; + uint8_t req_qos_len, req_pdpa_len; + uint8_t *req_qos, *req_pdpa; + struct tlv_parsed tp; + uint8_t transaction_id = gsm48_hdr_trans_id(gh); + struct sgsn_ggsn_ctx *ggsn; + struct sgsn_pdp_ctx *pdp; + enum gsm48_gsm_cause gsm_cause; + char apn_str[GSM_APN_LENGTH] = { 0, }; + char *hostname; + int rc; + struct gprs_llc_lle *lle; + + LOGMMCTXP(LOGL_INFO, mmctx, "-> ACTIVATE PDP CONTEXT REQ: SAPI=%u NSAPI=%u ", + act_req->req_llc_sapi, act_req->req_nsapi); + + /* FIXME: length checks! */ + req_qos_len = act_req->data[0]; + req_qos = act_req->data + 1; /* 10.5.6.5 */ + req_pdpa_len = act_req->data[1 + req_qos_len]; + req_pdpa = act_req->data + 1 + req_qos_len + 1; /* 10.5.6.4 */ + + switch (req_pdpa[0] & 0xf) { + case 0x0: + DEBUGPC(DMM, "ETSI "); + break; + case 0x1: + DEBUGPC(DMM, "IETF "); + break; + case 0xf: + DEBUGPC(DMM, "Empty "); + break; + } + + switch (req_pdpa[1]) { + case 0x21: + DEBUGPC(DMM, "IPv4 "); + if (req_pdpa_len >= 6) { + struct in_addr ia; + ia.s_addr = ntohl(*((uint32_t *) (req_pdpa+2))); + DEBUGPC(DMM, "%s ", inet_ntoa(ia)); + } + break; + case 0x57: + DEBUGPC(DMM, "IPv6 "); + if (req_pdpa_len >= 18) { + /* FIXME: print IPv6 address */ + } + break; + default: + DEBUGPC(DMM, "0x%02x ", req_pdpa[1]); + break; + } + + LOGPC(DMM, LOGL_INFO, "\n"); + + /* Check if NSAPI is out of range (TS 04.65 / 7.2) */ + if (act_req->req_nsapi < 5 || act_req->req_nsapi > 15) { + /* Send reject with GSM_CAUSE_INV_MAND_INFO */ + return gsm48_tx_gsm_act_pdp_rej(mmctx, transaction_id, + GSM_CAUSE_INV_MAND_INFO, + 0, NULL); + } + + /* Optional: Access Point Name, Protocol Config Options */ + if (req_pdpa + req_pdpa_len < msg->data + msg->len) + tlv_parse(&tp, &gsm48_sm_att_tlvdef, req_pdpa + req_pdpa_len, + (msg->data + msg->len) - (req_pdpa + req_pdpa_len), 0, 0); + else + memset(&tp, 0, sizeof(tp)); + + + /* put the non-TLV elements in the TLV parser structure to + * pass them on to the SGSN / GTP code */ + tp.lv[OSMO_IE_GSM_REQ_QOS].len = req_qos_len; + tp.lv[OSMO_IE_GSM_REQ_QOS].val = req_qos; + tp.lv[OSMO_IE_GSM_REQ_PDP_ADDR].len = req_pdpa_len; + tp.lv[OSMO_IE_GSM_REQ_PDP_ADDR].val = req_pdpa; + + /* Check if NSAPI is already in use */ + pdp = sgsn_pdp_ctx_by_nsapi(mmctx, act_req->req_nsapi); + if (pdp) { + /* We already have a PDP context for this TLLI + NSAPI tuple */ + if (pdp->sapi == act_req->req_llc_sapi && + pdp->ti == transaction_id) { + /* This apparently is a re-transmission of a PDP CTX + * ACT REQ (our ACT ACK must have got dropped) */ + rc = gsm48_tx_gsm_act_pdp_acc(pdp); + if (rc < 0) + return rc; + + if (pdp->mm->ran_type == MM_CTX_T_GERAN_Gb) { + /* Also re-transmit the SNDCP XID message */ + lle = &pdp->mm->gb.llme->lle[pdp->sapi]; + rc = sndcp_sn_xid_req(lle,pdp->nsapi); + if (rc < 0) + return rc; + } + + return 0; + } + + /* Send reject with GSM_CAUSE_NSAPI_IN_USE */ + return gsm48_tx_gsm_act_pdp_rej(mmctx, transaction_id, + GSM_CAUSE_NSAPI_IN_USE, + 0, NULL); + } + + if (mmctx->ggsn_lookup) { + if (mmctx->ggsn_lookup->sapi == act_req->req_llc_sapi && + mmctx->ggsn_lookup->ti == transaction_id) { + LOGMMCTXP(LOGL_NOTICE, mmctx, + "Re-transmission while doing look-up. Ignoring.\n"); + return 0; + } + } + + /* Only increment counter for a real activation, after we checked + * for re-transmissions */ + rate_ctr_inc(&mmctx->ctrg->ctr[GMM_CTR_PDP_CTX_ACT]); + + /* Determine GGSN based on APN and subscription options */ + ggsn = sgsn_mm_ctx_find_ggsn_ctx(mmctx, &tp, &gsm_cause, apn_str); + if (ggsn) + return activate_ggsn(mmctx, ggsn, transaction_id, + act_req->req_nsapi, act_req->req_llc_sapi, + &tp, 0); + + if (strlen(apn_str) == 0) + goto no_context; + if (!sgsn->cfg.dynamic_lookup) + goto no_context; + + /* schedule a dynamic look-up */ + mmctx->ggsn_lookup = talloc_zero(tall_bsc_ctx, struct sgsn_ggsn_lookup); + if (!mmctx->ggsn_lookup) + goto no_context; + + mmctx->ggsn_lookup->state = SGSN_GGSN_2DIGIT; + mmctx->ggsn_lookup->mmctx = mmctx; + strcpy(mmctx->ggsn_lookup->apn_str, apn_str); + + mmctx->ggsn_lookup->orig_msg = msg; + mmctx->ggsn_lookup->tp = tp; + + mmctx->ggsn_lookup->ti = transaction_id; + mmctx->ggsn_lookup->nsapi = act_req->req_nsapi; + mmctx->ggsn_lookup->sapi = act_req->req_llc_sapi; + + hostname = osmo_apn_qualify_from_imsi(mmctx->imsi, + mmctx->ggsn_lookup->apn_str, 0); + + LOGMMCTXP(LOGL_DEBUG, mmctx, "Going to query %s\n", hostname); + rc = sgsn_ares_query(sgsn, hostname, + ggsn_lookup_cb, mmctx->ggsn_lookup); + if (rc != 0) { + LOGMMCTXP(LOGL_ERROR, mmctx, "Failed to start ares query.\n"); + goto no_context; + } + *delete = 0; + + return 0; + +no_context: + LOGMMCTXP(LOGL_ERROR, mmctx, "No GGSN context found!\n"); + return gsm48_tx_gsm_act_pdp_rej(mmctx, transaction_id, + gsm_cause, 0, NULL); +} + +/* Section 9.5.1: Activate PDP Context Request */ +static int gsm48_rx_gsm_act_pdp_req(struct sgsn_mm_ctx *mmctx, + struct msgb *_msg) +{ + bool delete = 1; + struct msgb *msg; + int rc; + + rate_ctr_inc(&sgsn->rate_ctrs->ctr[CTR_PDP_ACTIVATE_REQUEST]); + + /* + * This is painful. We might not have a static GGSN + * configuration and then would need to copy the msg + * and re-do most of this routine (or call it again + * and make sure it only goes through the dynamic + * resolving. The question is what to optimize for + * and the dynamic resolution will be the right thing + * in the long run. + */ + msg = gprs_msgb_copy(_msg, __func__); + if (!msg) { + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(_msg); + uint8_t transaction_id = gsm48_hdr_trans_id(gh); + + LOGMMCTXP(LOGL_ERROR, mmctx, "-> ACTIVATE PDP CONTEXT REQ failed copy.\n"); + /* Send reject with GSM_CAUSE_INV_MAND_INFO */ + return gsm48_tx_gsm_act_pdp_rej(mmctx, transaction_id, + GSM_CAUSE_NET_FAIL, + 0, NULL); + } + + rc = do_act_pdp_req(mmctx, msg, &delete); + if (delete) + msgb_free(msg); + return rc; +} + +/* Section 9.5.8: Deactivate PDP Context Request */ +static int gsm48_rx_gsm_deact_pdp_req(struct sgsn_mm_ctx *mm, struct msgb *msg) +{ + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); + uint8_t transaction_id = gsm48_hdr_trans_id(gh); + struct sgsn_pdp_ctx *pdp; + + LOGMMCTXP(LOGL_INFO, mm, "-> DEACTIVATE PDP CONTEXT REQ (cause: %s)\n", + get_value_string(gsm48_gsm_cause_names, gh->data[0])); + rate_ctr_inc(&sgsn->rate_ctrs->ctr[CTR_PDP_UL_DEACTIVATE_REQUEST]); + + pdp = sgsn_pdp_ctx_by_tid(mm, transaction_id); + if (!pdp) { + LOGMMCTXP(LOGL_NOTICE, mm, "Deactivate PDP Context Request for " + "non-existing PDP Context (IMSI=%s, TI=%u)\n", + mm->imsi, transaction_id); + return _gsm48_tx_gsm_deact_pdp_acc(mm, transaction_id); + } + + return sgsn_delete_pdp_ctx(pdp); +} + +/* Section 9.5.9: Deactivate PDP Context Accept */ +static int gsm48_rx_gsm_deact_pdp_ack(struct sgsn_mm_ctx *mm, struct msgb *msg) +{ + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); + uint8_t transaction_id = gsm48_hdr_trans_id(gh); + struct sgsn_pdp_ctx *pdp; + + LOGMMCTXP(LOGL_INFO, mm, "-> DEACTIVATE PDP CONTEXT ACK\n"); + rate_ctr_inc(&sgsn->rate_ctrs->ctr[CTR_PDP_UL_DEACTIVATE_ACCEPT]); + + pdp = sgsn_pdp_ctx_by_tid(mm, transaction_id); + if (!pdp) { + LOGMMCTXP(LOGL_NOTICE, mm, "Deactivate PDP Context Accept for " + "non-existing PDP Context (IMSI=%s, TI=%u)\n", + mm->imsi, transaction_id); + return 0; + } + /* stop timer 3395 */ + pdpctx_timer_stop(pdp, 3395); + return sgsn_delete_pdp_ctx(pdp); +} + +static int gsm48_rx_gsm_status(struct sgsn_mm_ctx *ctx, struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + + LOGMMCTXP(LOGL_INFO, ctx, "-> GPRS SM STATUS (cause: %s)\n", + get_value_string(gsm48_gsm_cause_names, gh->data[0])); + + return 0; +} + +static void pdpctx_timer_cb(void *_pdp) +{ + struct sgsn_pdp_ctx *pdp = _pdp; + + pdp->num_T_exp++; + + switch (pdp->T) { + case 3395: /* waiting for PDP CTX DEACT ACK */ + if (pdp->num_T_exp >= 4) { + LOGPDPCTXP(LOGL_NOTICE, pdp, "T3395 expired >= 5 times\n"); + pdp->state = PDP_STATE_INACTIVE; + sgsn_delete_pdp_ctx(pdp); + break; + } + gsm48_tx_gsm_deact_pdp_req(pdp, GSM_CAUSE_NET_FAIL); + break; + default: + LOGPDPCTXP(LOGL_ERROR, pdp, "timer expired in unknown mode %u\n", + pdp->T); + } +} + + +/* GPRS Session Management */ +static int gsm0408_rcv_gsm(struct sgsn_mm_ctx *mmctx, struct msgb *msg, + struct gprs_llc_llme *llme) +{ + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); + int rc; + + /* MMCTX can be NULL when called */ + + if (!mmctx) { + LOGP(DMM, LOGL_NOTICE, "Cannot handle SM for unknown MM CTX\n"); + /* 6.1.3.6 */ + if (gh->msg_type == GSM48_MT_GSM_STATUS) + return 0; + + return gsm0408_gprs_force_reattach_oldmsg(msg, llme); + } + + switch (gh->msg_type) { + case GSM48_MT_GSM_ACT_PDP_REQ: + rc = gsm48_rx_gsm_act_pdp_req(mmctx, msg); + break; + case GSM48_MT_GSM_DEACT_PDP_REQ: + rc = gsm48_rx_gsm_deact_pdp_req(mmctx, msg); + break; + case GSM48_MT_GSM_DEACT_PDP_ACK: + rc = gsm48_rx_gsm_deact_pdp_ack(mmctx, msg); + break; + case GSM48_MT_GSM_STATUS: + rc = gsm48_rx_gsm_status(mmctx, msg); + break; + case GSM48_MT_GSM_REQ_PDP_ACT_REJ: + case GSM48_MT_GSM_ACT_AA_PDP_REQ: + case GSM48_MT_GSM_DEACT_AA_PDP_REQ: + LOGMMCTXP(LOGL_NOTICE, mmctx, "Unimplemented GSM 04.08 GSM msg type 0x%02x: %s\n", + gh->msg_type, osmo_hexdump((uint8_t *)gh, msgb_l3len(msg))); + rc = gsm48_tx_sm_status(mmctx, GSM_CAUSE_MSGT_NOTEXIST_NOTIMPL); + break; + default: + LOGMMCTXP(LOGL_NOTICE, mmctx, "Unknown GSM 04.08 GSM msg type 0x%02x: %s\n", + gh->msg_type, osmo_hexdump((uint8_t *)gh, msgb_l3len(msg))); + rc = gsm48_tx_sm_status(mmctx, GSM_CAUSE_MSGT_NOTEXIST_NOTIMPL); + break; + + } + + return rc; +} + +int gsm0408_gprs_force_reattach_oldmsg(struct msgb *msg, + struct gprs_llc_llme *llme) +{ + int rc; + if (llme) + gprs_llgmm_reset_oldmsg(msg, GPRS_SAPI_GMM, llme); + + rc = gsm48_tx_gmm_detach_req_oldmsg( + msg, GPRS_DET_T_MT_REATT_REQ, GMM_CAUSE_IMPL_DETACHED); + + return rc; +} + +int gsm0408_gprs_force_reattach(struct sgsn_mm_ctx *mmctx) +{ + int rc; + if (mmctx->ran_type == MM_CTX_T_GERAN_Gb) + gprs_llgmm_reset(mmctx->gb.llme); + + rc = gsm48_tx_gmm_detach_req( + mmctx, GPRS_DET_T_MT_REATT_REQ, GMM_CAUSE_IMPL_DETACHED); + + mm_ctx_cleanup_free(mmctx, "forced reattach"); + + return rc; +} + +/* Main entry point for incoming 04.08 GPRS messages from Iu */ +int gsm0408_gprs_rcvmsg_iu(struct msgb *msg, struct gprs_ra_id *ra_id, + uint16_t *sai) +{ + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); + uint8_t pdisc = gsm48_hdr_pdisc(gh); + struct sgsn_mm_ctx *mmctx; + int rc = -EINVAL; + + mmctx = sgsn_mm_ctx_by_ue_ctx(msg->dst); + if (mmctx) { + rate_ctr_inc(&mmctx->ctrg->ctr[GMM_CTR_PKTS_SIG_IN]); + if (ra_id) + memcpy(&mmctx->ra, ra_id, sizeof(mmctx->ra)); + } + + /* MMCTX can be NULL */ + + switch (pdisc) { + case GSM48_PDISC_MM_GPRS: + rc = gsm0408_rcv_gmm(mmctx, msg, NULL, false); +#warning "set drop_cipherable arg for gsm0408_rcv_gmm() from IuPS?" + break; + case GSM48_PDISC_SM_GPRS: + rc = gsm0408_rcv_gsm(mmctx, msg, NULL); + break; + default: + LOGMMCTXP(LOGL_NOTICE, mmctx, + "Unknown GSM 04.08 discriminator 0x%02x: %s\n", + pdisc, osmo_hexdump((uint8_t *)gh, msgb_l3len(msg))); + /* FIXME: return status message */ + break; + } + + /* MMCTX can be invalid */ + + return rc; +} + +/* Main entry point for incoming 04.08 GPRS messages from Gb */ +int gsm0408_gprs_rcvmsg_gb(struct msgb *msg, struct gprs_llc_llme *llme, + bool drop_cipherable) +{ + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); + uint8_t pdisc = gsm48_hdr_pdisc(gh); + struct sgsn_mm_ctx *mmctx; + struct gprs_ra_id ra_id; + int rc = -EINVAL; + + bssgp_parse_cell_id(&ra_id, msgb_bcid(msg)); + mmctx = sgsn_mm_ctx_by_tlli(msgb_tlli(msg), &ra_id); + if (mmctx) { + msgid2mmctx(mmctx, msg); + rate_ctr_inc(&mmctx->ctrg->ctr[GMM_CTR_PKTS_SIG_IN]); + mmctx->gb.llme = llme; + } + + /* MMCTX can be NULL */ + + switch (pdisc) { + case GSM48_PDISC_MM_GPRS: + rc = gsm0408_rcv_gmm(mmctx, msg, llme, drop_cipherable); + break; + case GSM48_PDISC_SM_GPRS: + rc = gsm0408_rcv_gsm(mmctx, msg, llme); + break; + default: + LOGMMCTXP(LOGL_NOTICE, mmctx, + "Unknown GSM 04.08 discriminator 0x%02x: %s\n", + pdisc, osmo_hexdump((uint8_t *)gh, msgb_l3len(msg))); + /* FIXME: return status message */ + break; + } + + /* MMCTX can be invalid */ + + return rc; +} + +int gprs_gmm_rx_suspend(struct gprs_ra_id *raid, uint32_t tlli) +{ + struct sgsn_mm_ctx *mmctx; + + mmctx = sgsn_mm_ctx_by_tlli(tlli, raid); + if (!mmctx) { + LOGP(DMM, LOGL_NOTICE, "SUSPEND request for unknown " + "TLLI=%08x\n", tlli); + return -EINVAL; + } + + if (mmctx->gmm_state != GMM_REGISTERED_NORMAL && + mmctx->gmm_state != GMM_REGISTERED_SUSPENDED) { + LOGMMCTXP(LOGL_NOTICE, mmctx, "SUSPEND request while state " + "!= REGISTERED (TLLI=%08x)\n", tlli); + return -EINVAL; + } + + /* Transition from REGISTERED_NORMAL to REGISTERED_SUSPENDED */ + mmctx->gmm_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->gmm_state != GMM_REGISTERED_NORMAL && + mmctx->gmm_state != GMM_REGISTERED_SUSPENDED) { + LOGMMCTXP(LOGL_NOTICE, mmctx, "RESUME request while state " + "!= SUSPENDED (TLLI=%08x)\n", tlli); + /* FIXME: should we not simply ignore it? */ + return -EINVAL; + } + + /* Transition from SUSPENDED to NORMAL */ + mmctx->gmm_state = GMM_REGISTERED_NORMAL; + return 0; +} + +#ifdef BUILD_IU +int iu_rab_act_ps(uint8_t rab_id, struct sgsn_pdp_ctx *pdp, bool use_x213_nsap) +{ + struct msgb *msg; + struct sgsn_mm_ctx *mm = pdp->mm; + struct ue_conn_ctx *uectx; + uint32_t ggsn_ip; + + uectx = mm->iu.ue_ctx; + + /* Get the IP address for ggsn user plane */ + memcpy(&ggsn_ip, pdp->lib->gsnru.v, pdp->lib->gsnru.l); + ggsn_ip = htonl(ggsn_ip); + + LOGP(DRANAP, LOGL_DEBUG, "Assigning RAB: rab_id=%d, ggsn_ip=%x," + " teid_gn=%x, use_x213_nsap=%d\n", + rab_id, ggsn_ip, pdp->lib->teid_gn, use_x213_nsap); + + msg = ranap_new_msg_rab_assign_data(rab_id, ggsn_ip, + pdp->lib->teid_gn, use_x213_nsap); + msg->l2h = msg->data; + return iu_rab_act(uectx, msg); +} +#endif |