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authorPau Espin Pedrol <pespin@sysmocom.de>2019-08-30 20:47:02 +0200
committerPau Espin Pedrol <pespin@sysmocom.de>2019-09-02 14:03:04 +0200
commit762c39ccc65e0307a32b89e8bf7daaad2b6b66b4 (patch)
treec1d0de85859115be63d89d7802b278cfe013019d /src/sgsn/gprs_gmm.c
parentea05d5c5f89f034a8d2c4151507f59a520535d9a (diff)
Move out sgsn to its own subdir
Diffstat (limited to 'src/sgsn/gprs_gmm.c')
-rw-r--r--src/sgsn/gprs_gmm.c2852
1 files changed, 2852 insertions, 0 deletions
diff --git a/src/sgsn/gprs_gmm.c b/src/sgsn/gprs_gmm.c
new file mode 100644
index 00000000..edb7eea1
--- /dev/null
+++ b/src/sgsn/gprs_gmm.c
@@ -0,0 +1,2852 @@
+/* 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 "bscconfig.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/core/tdef.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>
+
+#include <osmocom/sgsn/debug.h>
+#include <osmocom/sgsn/gprs_llc.h>
+#include <osmocom/sgsn/gprs_sgsn.h>
+#include <osmocom/sgsn/gprs_gmm.h>
+#include <osmocom/sgsn/gprs_utils.h>
+#include <osmocom/sgsn/gprs_subscriber.h>
+#include <osmocom/sgsn/sgsn.h>
+#include <osmocom/sgsn/gprs_gmm_attach.h>
+#include <osmocom/sgsn/gprs_mm_state_gb_fsm.h>
+#include <osmocom/sgsn/gprs_mm_state_iu_fsm.h>
+#include <osmocom/sgsn/signal.h>
+#include <osmocom/sgsn/gprs_sndcp.h>
+#include <osmocom/sgsn/gprs_ranap.h>
+
+#include <pdp.h>
+
+#define PTMSI_ALLOC
+
+/* 3GPP TS 04.08 sec 6.1.3.4.3(.a) "Abnormal cases" */
+#define T339X_MAX_RETRANS 4
+
+extern struct sgsn_instance *sgsn;
+extern void *tall_sgsn_ctx;
+
+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 },
+ },
+};
+
+/* 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 long seconds;
+ if (osmo_timer_pending(&mm->timer))
+ LOGMMCTXP(LOGL_ERROR, mm, "Starting MM timer %u while old "
+ "timer %u pending\n", T, mm->T);
+
+ seconds = osmo_tdef_get(sgsn->cfg.T_defs, T, OSMO_TDEF_S, -1);
+
+ 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)
+{
+ unsigned long T3314, T3312;
+
+ T3314 = osmo_tdef_get(sgsn->cfg.T_defs, 3314, OSMO_TDEF_S, -1);
+ T3312 = osmo_tdef_get(sgsn->cfg.T_defs, 3312, OSMO_TDEF_S, -1);
+ return T3314 + (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
+ if (MSG_IU_UE_CTX(msg))
+ 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_IU_UE_CTX_SET(msg, MSG_IU_UE_CTX(old));
+}
+
+/* Store BVCI/NSEI in MM context */
+void msgid2mmctx(struct sgsn_mm_ctx *mm, const struct msgb *msg)
+{
+ /* check for Iu or Gb */
+ if (!MSG_IU_UE_CTX(msg)) {
+ mm->gb.bvci = msgb_bvci(msg);
+ mm->gb.nsei = msgb_nsei(msg);
+ }
+#ifdef BUILD_IU
+ else {
+ /* In case a Iu connection is reconnected we need to update the ue ctx */
+ /* FIXME: the old ue_ctx have to be freed/disconnected */
+ mm->iu.ue_ctx = MSG_IU_UE_CTX(msg);
+ if (mm->ran_type == MM_CTX_T_UTRAN_Iu
+ && mm->iu.ue_ctx) {
+ 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_IU_UE_CTX_SET(msg, 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;
+
+ switch(ctx->ran_type) {
+ case MM_CTX_T_UTRAN_Iu:
+ osmo_fsm_inst_dispatch(ctx->iu.mm_state_fsm, E_PMM_IMPLICIT_DETACH, NULL);
+ break;
+ case MM_CTX_T_GERAN_Gb:
+ osmo_fsm_inst_dispatch(ctx->gb.mm_state_fsm, E_MM_IMPLICIT_DETACH, NULL);
+ break;
+ }
+
+ 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 */
+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;
+ unsigned long t;
+#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 */
+ t = osmo_tdef_get(sgsn->cfg.T_defs, 3312, OSMO_TDEF_S, -1);
+ aa->ra_upd_timer = gprs_secs_to_tmr_floor(t);
+ aa->radio_prio = 4; /* lowest */
+ gsm48_encode_ra(&aa->ra_id, &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.
+ */
+ t = osmo_tdef_get(sgsn->cfg.T_defs, 3314, OSMO_TDEF_S, -1);
+ msgb_tv_put(msg, GSM48_IE_GMM_TIMER_READY, gprs_secs_to_tmr_floor(t));
+
+#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);
+}
+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 */
+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 § 9.4.9: Authentication and Ciphering Request */
+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;
+ int rc;
+
+ LOGMMCTXP(LOGL_INFO, mm, "<- GPRS AUTH AND CIPHERING REQ (rand = %s,"
+ " mmctx_is_r99=%d, vec->auth_types=0x%x",
+ osmo_hexdump(vec->rand, sizeof(vec->rand)),
+ mmctx_is_r99(mm), vec->auth_types);
+ 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: */
+ rc = osmo_get_rand_id(&rbyte, 1);
+ if (rc < 0) {
+ LOGMMCTXP(LOGL_ERROR, mm, "osmo_get_rand_id() failed for A&C ref: %s\n", strerror(-rc));
+ return rc;
+ }
+
+ 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);
+}
+
+/* 3GPP TS 24.008 § 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 enum osmo_sub_auth_type 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;
+
+ /* 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.
+ * However, on GERAN, even if we sent a UMTS AKA Authentication Request, the MS may decide to
+ * instead reply with a GSM AKA SRES response. */
+ if (is_utran
+ || (mmctx_is_r99(ctx) && (vec->auth_types & OSMO_AUTH_TYPE_UMTS)
+ && (res_len > sizeof(vec->sres)))) {
+ 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 OSMO_AUTH_TYPE_NONE;
+ }
+
+ 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 expect_type;
+
+auth_mismatch:
+ LOGMMCTXP(LOGL_ERROR, ctx, "Auth mismatch: expected %s = %s\n",
+ expect_str, osmo_hexdump_nospc(expect_res, expect_res_len));
+ return OSMO_AUTH_TYPE_NONE;
+}
+
+/* 3GPP TS 24.008 § 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));
+ ctx->sec_ctx = check_auth_resp(ctx, false, &at->vec, res, res_len);
+ if (!sgsn_mm_ctx_is_authenticated(ctx)) {
+ rc = gsm48_tx_gmm_auth_ciph_rej(ctx);
+ mm_ctx_cleanup_free(ctx, "GPRS AUTH AND CIPH REJECT");
+ return rc;
+ }
+
+ 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 osmo_fsm_inst_dispatch(ctx->gmm_att_req.fsm, E_AUTH_RESP_RECV_SUCCESS, NULL);
+}
+
+/* 3GPP TS 24.008 § 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 osmo_fsm_inst_dispatch(ctx->gmm_att_req.fsm, E_AUTH_RESP_RECV_RESYNC, NULL);
+ /* 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;
+}
+
+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));
+ }
+}
+
+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);
+
+/* Check if we can already authorize a subscriber */
+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);
+ 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);
+ 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
+ && !sgsn_mm_ctx_is_authenticated(ctx)) {
+ struct gsm_auth_tuple *at = &ctx->auth_triplet;
+
+ mmctx_timer_start(ctx, 3360);
+ return gsm48_tx_gmm_auth_ciph_req(ctx, &at->vec, at->key_seq,
+ false);
+ }
+
+ if (ctx->auth_state == SGSN_AUTH_AUTHENTICATE && sgsn_mm_ctx_is_authenticated(ctx) &&
+ 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);
+ 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;
+ osmo_fsm_inst_dispatch(ctx->iu.mm_state_fsm, E_PMM_PS_ATTACH, NULL);
+ 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->sec_ctx = OSMO_AUTH_TYPE_NONE;
+
+ if (ctx->gmm_att_req.fsm->state != ST_INIT)
+ osmo_fsm_inst_dispatch(ctx->gmm_att_req.fsm, E_VLR_ANSWERED, (void *) 0);
+ else
+ 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 */
+ if (ctx->gmm_att_req.fsm->state != ST_INIT)
+ osmo_fsm_inst_dispatch(ctx->gmm_att_req.fsm, E_VLR_ANSWERED, (void *) 0);
+ 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);
+ if (ctx->gmm_att_req.fsm->state != ST_INIT)
+ osmo_fsm_inst_dispatch(ctx->gmm_att_req.fsm, E_REJECT, (void *) (long) gmm_cause);
+ 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_IMSI, 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;
+ long mi_typel = mi_type;
+ 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 osmo_fsm_inst_dispatch(ctx->gmm_att_req.fsm, E_IDEN_RESP_RECV, (void *)mi_typel);
+}
+
+/* Allocate a new P-TMSI and change context state */
+static inline void ptmsi_update(struct sgsn_mm_ctx *ctx)
+{
+ uint32_t ptmsi;
+ /* Don't change the P-TMSI if a P-TMSI re-assignment is under way */
+ if (ctx->gmm_state != GMM_COMMON_PROC_INIT) {
+ ptmsi = sgsn_alloc_ptmsi();
+ if (ptmsi != GSM_RESERVED_TMSI) {
+ ctx->p_tmsi_old = ctx->p_tmsi;
+ ctx->p_tmsi = ptmsi;
+ } else
+ LOGMMCTXP(LOGL_ERROR, ctx, "P-TMSI allocation failure: using old one.\n");
+ }
+ ctx->gmm_state = GMM_COMMON_PROC_INIT;
+}
+
+/* 3GPP TS 24.008 § 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. */
+
+ if (!MSG_IU_UE_CTX(msg)) {
+ /* Gb mode */
+ cid = bssgp_parse_cell_id(&ra_id, msgb_bcid(msg));
+ } else {
+#ifdef BUILD_IU
+ ra_id = MSG_IU_UE_CTX(msg)->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.
+ * The follow-on request can be signaled in an Attach Request on IuPS.
+ * This means the MS/UE asks to keep the PS connection open for further requests
+ * after the Attach Request succeed.
+ * The SGSN can decide if it close the connection or not. Both are spec conform. */
+
+ /* 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 (MSG_IU_UE_CTX(msg))
+ ctx = sgsn_mm_ctx_alloc_iu(MSG_IU_UE_CTX(msg));
+ 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));
+ }
+ 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_IU_UE_CTX(msg))
+ ctx = sgsn_mm_ctx_alloc_iu(MSG_IU_UE_CTX(msg));
+ else
+ ctx = sgsn_mm_ctx_alloc_gb(msgb_tlli(msg), &ra_id);
+ if (!ctx) {
+ reject_cause = GMM_CAUSE_NET_FAIL;
+ goto rejected;
+ }
+ ctx->p_tmsi = tmsi;
+ }
+ 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;
+ }
+
+ if (ctx->ran_type == MM_CTX_T_GERAN_Gb) {
+ ctx->gb.tlli = msgb_tlli(msg);
+ ctx->gb.llme = llme;
+ }
+ msgid2mmctx(ctx, msg);
+ /* 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 */
+ ptmsi_update(ctx);
+#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 (sgsn_mm_ctx_is_authenticated(ctx))
+ gprs_llme_copy_key(ctx, ctx->gb.llme);
+
+ gprs_llgmm_assign(ctx->gb.llme, ctx->gb.tlli, ctx->gb.tlli_new);
+ }
+
+ osmo_fsm_inst_dispatch(ctx->gmm_att_req.fsm, E_ATTACH_REQ_RECV, msg);
+ return 0;
+
+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 if (llme)
+ gprs_llgmm_unassign(llme);
+
+ return rc;
+
+}
+
+
+/* Checks if two attach request contain the IEs and IE values
+ * return 0 if equal
+ * return -1 if error
+ * return 1 if unequal
+ *
+ * Only do a simple memcmp for now.
+ */
+int gprs_gmm_attach_req_ies(struct msgb *a, struct msgb *b)
+{
+ struct gsm48_hdr *gh_a = (struct gsm48_hdr *) msgb_gmmh(a);
+ struct gsm48_hdr *gh_b = (struct gsm48_hdr *) msgb_gmmh(b);
+
+#define GMM_ATTACH_REQ_LEN 26
+
+ /* there is the LLC FCS behind */
+ if (msgb_l3len(a) < GMM_ATTACH_REQ_LEN || msgb_l3len(b) < GMM_ATTACH_REQ_LEN)
+ return -1;
+
+ return !!memcmp(gh_a, gh_b, GMM_ATTACH_REQ_LEN);
+}
+
+/* 3GPP TS 24.008 § 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;
+ unsigned long t;
+
+ 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 */
+ t = osmo_tdef_get(sgsn->cfg.T_defs, 3312, OSMO_TDEF_S, -1);
+ rua->ra_upd_timer = gprs_secs_to_tmr_floor(t);
+
+ gsm48_encode_ra(&rua->ra_id, &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 */
+ t = osmo_tdef_get(sgsn->cfg.T_defs, 3314, OSMO_TDEF_S, -1);
+ msgb_tv_put(msg, GSM48_IE_GMM_TIMER_READY, gprs_secs_to_tmr_floor(t));
+
+ /* Option: MS ID, ... */
+ return gsm48_gmm_sendmsg(msg, 0, mm, true);
+}
+
+/* Chapter 9.4.17: Routing area update reject */
+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);
+ }
+ }
+ }
+}
+
+/* 3GPP TS 24.008 § 4.7.13.4 Service request procedure not accepted by the
+ * network. Returns true if MS has active PDP contexts in pdp_status */
+bool pdp_status_has_active_nsapis(const uint8_t *pdp_status, const size_t pdp_status_len)
+{
+ size_t i;
+
+ for (i = 0; i < pdp_status_len; i++)
+ if (pdp_status[i] != 0)
+ return true;
+
+ return false;
+}
+
+/* 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.
+ * The follow-on request can be signaled in an Attach Request on IuPS.
+ * This means the MS/UE asks to keep the PS connection open for further requests
+ * after the Attach Request succeed.
+ * The SGSN can decide if it close the connection or not. Both are spec conform. */
+
+ /* Update Type 10.5.5.18 */
+ upd_type = *cur++ & 0x07;
+
+ rate_ctr_inc(&sgsn->rate_ctrs->ctr[CTR_GPRS_ROUTING_AREA_REQUEST]);
+ LOGMMCTXP(LOGL_INFO, mmctx, "-> 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) {
+ LOGMMCTXP(LOGL_ERROR, mmctx,
+ "Rejecting GMM RA Update Request: MS Radio Access Capability too long"
+ " (ms_ra_acc_cap_len = %u > 52)\n", ms_ra_acc_cap_len);
+ 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:
+ LOGMMCTXP(LOGL_NOTICE, mmctx, "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 */
+ if (!MSG_IU_UE_CTX(msg)) {
+ /* Gb */
+ 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);
+ const 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
+ LOGIUP(MSG_IU_UE_CTX(msg), LOGL_ERROR,
+ "Rejecting GMM RA Update Request: No Iu support\n");
+ 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: %s\n",
+ msgb_tlli(msg),
+ mmctx->p_tmsi, mmctx->p_tmsi_old,
+ mmctx->gb.tlli, mmctx->gb.tlli_new,
+ osmo_rai_name(&mmctx->ra));
+
+ 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: %s\n",
+ osmo_rai_name(&mmctx->ra));
+ /* mmctx is set to NULL and gprs_llgmm_unassign(llme) will be
+ called below, let's make sure we don't keep dangling llme
+ pointers in mmctx (OS#3957). */
+ if (mmctx->ran_type == MM_CTX_T_GERAN_Gb)
+ OSMO_ASSERT(mmctx->gb.llme == NULL);
+ mmctx = NULL;
+ }
+
+ if (!mmctx) {
+ if (llme) {
+ /* send a XID reset to re-set all LLC sequence numbers
+ * in the MS */
+ LOGGBP(llme, LOGL_NOTICE, "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 */
+ LOGGBIUP(llme, msg, LOGL_ERROR, "Rejecting GMM RA Update Request: MS should GMM Attach first\n");
+ 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
+ ptmsi_update(mmctx);
+
+ /* Start T3350 and re-transmit up to 5 times until ATTACH COMPLETE */
+ mmctx->t3350_mode = GMM_T3350_MODE_RAU;
+ mmctx_timer_start(mmctx, 3350);
+#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 accepting the old one during Rx */
+ 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 § 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 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_IU_UE_CTX(msg)) {
+ LOGPC(DMM, LOGL_INFO, "Invalid if not in Iu mode\n");
+ return -1;
+ }
+
+ /* Skip Ciphering key sequence number 10.5.1.2 */
+ /* uint8_t 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_IMPL_DETACHED;
+ 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_IMPL_DETACHED;
+ 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;
+
+ /* 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);
+ const size_t pdp_status_len = TLVP_LEN(&tp, GSM48_IE_GMM_PDP_CTX_STATUS);
+
+ process_ms_ctx_status(ctx, pdp_status);
+
+ /* 3GPP TS 24.008 § 4.7.13.4 Service request procedure not
+ * accepted by the network. Cause #40. If MS has PDP Contexts in
+ * Active state in pdp_status but there is no PDP contexts on
+ * SGSN side then Reject with the cause will force the mobile to
+ * reset PDP contexts */
+ if (llist_empty(&ctx->pdp_list) && pdp_status_has_active_nsapis(pdp_status, pdp_status_len)) {
+ reject_cause = GMM_CAUSE_NO_PDP_ACTIVATED;
+ goto rejected;
+ }
+ }
+
+
+ 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;
+}
+
+/* Rx GPRS Mobility Management. MMCTX can be NULL when called. On !Gb (Iu), llme is NULL */
+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;
+
+ 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) {
+ LOGGBP(llme, 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);
+
+ /* Don't reply to deatch requests, reason power off */
+ if (gh->msg_type == GSM48_MT_GMM_DETACH_REQ &&
+ gh->data[0] & 0x8) {
+ return 0;
+ }
+
+
+ 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");
+
+#ifdef BUILD_IU
+ if (mmctx->iu.ue_ctx) {
+ ranap_iu_tx_release(mmctx->iu.ue_ctx, NULL);
+ }
+#endif
+
+ mmctx_timer_stop(mmctx, 3350);
+ mmctx->t3350_mode = GMM_T3350_MODE_NONE;
+ mmctx->p_tmsi_old = 0;
+ mmctx->pending_req = 0;
+ mmctx->gmm_state = GMM_REGISTERED_NORMAL;
+ switch(mmctx->ran_type) {
+ case MM_CTX_T_UTRAN_Iu:
+ osmo_fsm_inst_dispatch(mmctx->iu.mm_state_fsm, E_PMM_PS_ATTACH, NULL);
+ break;
+ case 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, TLLI_UNASSIGNED,
+ mmctx->gb.tlli_new);
+ osmo_fsm_inst_dispatch(mmctx->gb.mm_state_fsm, E_MM_GPRS_ATTACH, NULL);
+ break;
+ }
+ rc = 0;
+
+ osmo_fsm_inst_dispatch(mmctx->gmm_att_req.fsm, E_ATTACH_COMPLETE_RECV, 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;
+ mmctx->gmm_state = GMM_REGISTERED_NORMAL;
+ switch(mmctx->ran_type) {
+ case MM_CTX_T_UTRAN_Iu:
+ osmo_fsm_inst_dispatch(mmctx->iu.mm_state_fsm, E_PMM_RA_UPDATE, NULL);
+ break;
+ case MM_CTX_T_GERAN_Gb:
+ /* Unassign the old TLLI */
+ mmctx->gb.tlli = mmctx->gb.tlli_new;
+ gprs_llgmm_assign(mmctx->gb.llme, TLLI_UNASSIGNED,
+ mmctx->gb.tlli_new);
+ osmo_fsm_inst_dispatch(mmctx->gb.mm_state_fsm, E_MM_RA_UPDATE, NULL);
+ break;
+ }
+ 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 REALLOCATION 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, TLLI_UNASSIGNED, 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:
+ LOGGBIUP(llme, msg, 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;
+ int rc;
+ unsigned long seconds;
+
+ 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;
+ }
+ seconds = osmo_tdef_get(sgsn->cfg.T_defs, 3350, OSMO_TDEF_S, -1);
+ osmo_timer_schedule(&mm->timer, seconds, 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;
+
+ rc = gsm48_tx_gmm_auth_ciph_req(mm, &at->vec, at->key_seq, false);
+ if (rc < 0) {
+ LOGMMCTXP(LOGL_ERROR, mm, "failed sending Auth. & Ciph. Request: %s \n", strerror(-rc));
+ } else {
+ seconds = osmo_tdef_get(sgsn->cfg.T_defs, 3360, OSMO_TDEF_S, -1);
+ osmo_timer_schedule(&mm->timer, seconds, 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);
+ seconds = osmo_tdef_get(sgsn->cfg.T_defs, 3370, OSMO_TDEF_S, -1);
+ osmo_timer_schedule(&mm->timer, seconds, 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_rearm(struct sgsn_pdp_ctx *pdp, unsigned int T)
+{
+ unsigned long seconds;
+ if (osmo_timer_pending(&pdp->timer))
+ LOGPDPCTXP(LOGL_ERROR, pdp, "Scheduling PDP timer %u while old "
+ "timer %u pending\n", T, pdp->T);
+ seconds = osmo_tdef_get(sgsn->cfg.T_defs, T, OSMO_TDEF_S, -1);
+ osmo_timer_schedule(&pdp->timer, seconds, 0);
+}
+
+static void pdpctx_timer_start(struct sgsn_pdp_ctx *pdp, unsigned int T)
+{
+ 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;
+
+ osmo_timer_setup(&pdp->timer, pdpctx_timer_cb, pdp);
+ pdpctx_timer_rearm(pdp, pdp->T);
+}
+
+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);
+}
+
+void pdp_ctx_detach_mm_ctx(struct sgsn_pdp_ctx *pdp)
+{
+ /* Detach from MM context */
+ llist_del(&pdp->list);
+ pdp->mm = NULL;
+
+ /* stop timer 3395 */
+ pdpctx_timer_stop(pdp, 3395);
+}
+
+#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
+
+/* 3GPP TS 24.008 § 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);
+}
+
+/* 3GPP TS 24.008 § 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: %s\n",
+ get_value_string(gsm48_gsm_cause_names, 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);
+}
+
+/* 3GPP TS 24.008 § 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, bool teardown)
+{
+ struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 PDP DET REQ");
+ struct gsm48_hdr *gh;
+ uint8_t transaction_id = tid ^ 0x8; /* flip */
+ uint8_t tear_down_ind = (0x9 << 4) | (!!teardown);
+
+ 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);
+ msgb_v_put(msg, tear_down_ind);
+
+ return gsm48_gmm_sendmsg(msg, 0, mm, true);
+}
+int gsm48_tx_gsm_deact_pdp_req(struct sgsn_pdp_ctx *pdp, uint8_t sm_cause, bool teardown)
+{
+ pdpctx_timer_start(pdp, 3395);
+
+ return _gsm48_tx_gsm_deact_pdp_req(pdp->mm, pdp->ti, sm_cause, teardown);
+}
+
+/* 3GPP TS 24.008 § 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;
+ char buf[INET_ADDRSTRLEN];
+
+ /* 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_ntop(AF_INET, addr, buf, sizeof(buf)));
+
+ /* 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;
+ char buf[INET_ADDRSTRLEN];
+
+ 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_ntop(AF_INET, &ia, buf, sizeof(buf)));
+ }
+ 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_sgsn_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);
+}
+
+/* 3GPP TS 24.008 § 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 = bssgp_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;
+}
+
+/* 3GPP TS 24.008 § 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);
+}
+
+/* 3GPP TS 24.008 § 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);
+ if (pdp->ggsn)
+ return sgsn_delete_pdp_ctx(pdp);
+ /* GTP side already detached, freeing */
+ sgsn_pdp_ctx_free(pdp);
+ return 0;
+}
+
+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 > T339X_MAX_RETRANS) {
+ LOGPDPCTXP(LOGL_NOTICE, pdp, "T3395 expired > %d times\n", T339X_MAX_RETRANS);
+ pdp->state = PDP_STATE_INACTIVE;
+ if (pdp->ggsn)
+ sgsn_delete_pdp_ctx(pdp);
+ else
+ sgsn_pdp_ctx_free(pdp);
+ break;
+ }
+ _gsm48_tx_gsm_deact_pdp_req(pdp->mm, pdp->ti, GSM_CAUSE_NET_FAIL, true);
+ pdpctx_timer_rearm(pdp, 3395);
+ break;
+ default:
+ LOGPDPCTXP(LOGL_ERROR, pdp, "timer expired in unknown mode %u\n",
+ pdp->T);
+ }
+}
+
+
+/* GPRS Session Management */
+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) {
+ LOGGBIUP(llme, msg, 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;
+}
+
+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;
+}