diff options
author | Neels Hofmeyr <neels@hofmeyr.de> | 2017-07-09 22:09:18 +0200 |
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committer | Neels Hofmeyr <neels@hofmeyr.de> | 2017-08-30 14:11:25 +0200 |
commit | 7b656884cfadfd8c56355e8a6c690721827b5b30 (patch) | |
tree | 7f3357a94992d953021a28ec20336c4578f23052 /src/gprs/gprs_gmm.c | |
parent | 31a11aa75b5aad8887213bcd88cddc1b79b5954f (diff) |
split off osmo-bsc: remove files, apply build
Change-Id: I64d84c52f6e38e98144eb9be8f0ab82e0e1f6cca
Diffstat (limited to 'src/gprs/gprs_gmm.c')
-rw-r--r-- | src/gprs/gprs_gmm.c | 2937 |
1 files changed, 0 insertions, 2937 deletions
diff --git a/src/gprs/gprs_gmm.c b/src/gprs/gprs_gmm.c deleted file mode 100644 index 032137f0b..000000000 --- a/src/gprs/gprs_gmm.c +++ /dev/null @@ -1,2937 +0,0 @@ -/* 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> -#include <osmocom/ranap/iu_client.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/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 ranap_ue_conn_ctx *ctx, enum ranap_iu_event_type type, void *data) -{ - struct sgsn_mm_ctx *mm; - int rc = -1; - - mm = sgsn_mm_ctx_by_ue_ctx(ctx); - -#define REQUIRE_MM \ - if (!mm) { \ - LOGP(DRANAP, LOGL_NOTICE, "Cannot find mm ctx for IU event %d\n", type); \ - return rc; \ - } - - switch (type) { - case RANAP_IU_EVENT_RAB_ASSIGN: - REQUIRE_MM - rc = sgsn_ranap_rab_ass_resp(mm, (RANAP_RAB_SetupOrModifiedItemIEs_t *)data); - break; - case RANAP_IU_EVENT_IU_RELEASE: - /* fall thru */ - case RANAP_IU_EVENT_LINK_INVALIDATED: - /* Clean up ranap_ue_conn_ctx here */ - if (mm) - LOGMMCTXP(LOGL_INFO, mm, "IU release for imsi %s\n", mm->imsi); - else - LOGMMCTXP(LOGL_INFO, mm, "IU release for UE conn 0x%x\n", - ctx->conn_id); - if (mm && mm->pmm_state == PMM_CONNECTED) - mmctx_set_pmm_state(mm, PMM_IDLE); - rc = 0; - break; - case RANAP_IU_EVENT_SECURITY_MODE_COMPLETE: - REQUIRE_MM - /* 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 ranap_iu_tx(msg, GPRS_SAPI_GMM); -#endif - } - -#ifdef BUILD_IU - /* In Iu mode, msg->dst contains the ranap_ue_conn_ctx pointer, in Gb mode - * dst is empty. */ - /* FIXME: have a more explicit indicator for Iu messages */ - if (msg->dst) - return ranap_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; - if (mm->ran_type == MM_CTX_T_UTRAN_Iu - && mm->iu.ue_ctx) { -#ifdef BUILD_IU - mm->iu.ue_ctx->rab_assign_addr_enc = - sgsn->cfg.iu.rab_assign_addr_enc; -#endif - } -} - -/* 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 -/* Send RAB activation requests for all PDP contexts */ -void activate_pdp_rabs(struct sgsn_mm_ctx *ctx) -{ - struct sgsn_pdp_ctx *pdp; - if (ctx->ran_type != MM_CTX_T_UTRAN_Iu) - return; - llist_for_each_entry(pdp, &ctx->pdp_list, list) { - iu_rab_act_ps(pdp->nsapi, pdp); - } -} -#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 = ranap_iu_tx_sec_mode_cmd(ctx->iu.ue_ctx, &ctx->auth_triplet.vec, 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 ranap_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 { -#ifdef BUILD_IU - ra_id = ((struct ranap_ue_conn_ctx*)msg->dst)->ra_id; -#else - LOGMMCTXP(LOGL_ERROR, ctx, "Cannot handle Iu Attach Request, built without Iu support\n"); - return -ENOTSUP; -#endif - } - - /* 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; - - /* 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 ranap_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) -{ - struct msgb *msg; - struct sgsn_mm_ctx *mm = pdp->mm; - struct ranap_ue_conn_ctx *uectx; - uint32_t ggsn_ip; - bool use_x213_nsap; - - uectx = mm->iu.ue_ctx; - use_x213_nsap = (uectx->rab_assign_addr_enc == RANAP_NSAP_ADDR_ENC_X213); - - /* 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 ranap_iu_rab_act(uectx, msg); -} -#endif |