2019-09-02 16:27:27 +00:00
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/* Section "9.5 GPRS Session Management Messages"
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* 3GPP TS 04.08 version 7.21.0 Release 1998 / ETSI TS 100 940 V7.21.0 */
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/* (C) 2009-2015 by Harald Welte <laforge@gnumonks.org>
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* (C) 2010 by On-Waves
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* (C) 2019 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include "bscconfig.h"
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#include <osmocom/core/rate_ctr.h>
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#include <osmocom/core/tdef.h>
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#include <osmocom/gsm/apn.h>
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#include <osmocom/gprs/gprs_bssgp.h>
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#include <osmocom/sgsn/gprs_sm.h>
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#include <osmocom/sgsn/gprs_gmm.h>
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#include <osmocom/sgsn/gprs_utils.h>
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2023-01-04 20:30:28 +00:00
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#include <osmocom/sgsn/gtp_ggsn.h>
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2019-09-02 16:27:27 +00:00
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#include <osmocom/sgsn/sgsn.h>
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#include <osmocom/sgsn/debug.h>
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#include <osmocom/sgsn/gprs_llc.h>
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#include <osmocom/sgsn/gprs_sndcp.h>
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#include <osmocom/sgsn/gprs_ranap.h>
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2023-01-05 18:19:32 +00:00
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#include <osmocom/sgsn/gtp.h>
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2019-09-02 16:27:27 +00:00
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extern void *tall_sgsn_ctx;
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/* 3GPP TS 04.08 sec 6.1.3.4.3(.a) "Abnormal cases" */
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#define T339X_MAX_RETRANS 4
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static const struct tlv_definition gsm48_sm_att_tlvdef = {
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.def = {
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[GSM48_IE_GSM_APN] = { TLV_TYPE_TLV, 0 },
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[GSM48_IE_GSM_PROTO_CONF_OPT] = { TLV_TYPE_TLV, 0 },
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[GSM48_IE_GSM_PDP_ADDR] = { TLV_TYPE_TLV, 0 },
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[GSM48_IE_GSM_AA_TMR] = { TLV_TYPE_TV, 1 },
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[GSM48_IE_GSM_NAME_FULL] = { TLV_TYPE_TLV, 0 },
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[GSM48_IE_GSM_NAME_SHORT] = { TLV_TYPE_TLV, 0 },
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[GSM48_IE_GSM_TIMEZONE] = { TLV_TYPE_FIXED, 1 },
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[GSM48_IE_GSM_UTC_AND_TZ] = { TLV_TYPE_FIXED, 7 },
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[GSM48_IE_GSM_LSA_ID] = { TLV_TYPE_TLV, 0 },
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},
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};
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static struct gsm48_qos default_qos = {
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.delay_class = 4, /* best effort */
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.reliab_class = GSM48_QOS_RC_LLC_UN_RLC_ACK_DATA_PROT,
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.peak_tput = GSM48_QOS_PEAK_TPUT_32000bps,
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.preced_class = GSM48_QOS_PC_NORMAL,
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.mean_tput = GSM48_QOS_MEAN_TPUT_BEST_EFFORT,
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.traf_class = GSM48_QOS_TC_INTERACTIVE,
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.deliv_order = GSM48_QOS_DO_UNORDERED,
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.deliv_err_sdu = GSM48_QOS_ERRSDU_YES,
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.max_sdu_size = GSM48_QOS_MAXSDU_1520,
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.max_bitrate_up = GSM48_QOS_MBRATE_63k,
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.max_bitrate_down = GSM48_QOS_MBRATE_63k,
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.resid_ber = GSM48_QOS_RBER_5e_2,
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.sdu_err_ratio = GSM48_QOS_SERR_1e_2,
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.handling_prio = 3,
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.xfer_delay = 0x10, /* 200ms */
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.guar_bitrate_up = GSM48_QOS_MBRATE_0k,
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.guar_bitrate_down = GSM48_QOS_MBRATE_0k,
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.sig_ind = 0, /* not optimised for signalling */
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.max_bitrate_down_ext = 0, /* use octet 9 */
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.guar_bitrate_down_ext = 0, /* use octet 13 */
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};
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/* GPRS SESSION MANAGEMENT */
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static void pdpctx_timer_cb(void *_mm);
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static void pdpctx_timer_rearm(struct sgsn_pdp_ctx *pdp, unsigned int T)
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{
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unsigned long seconds;
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if (osmo_timer_pending(&pdp->timer))
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LOGPDPCTXP(LOGL_ERROR, pdp, "Scheduling PDP timer %u while old "
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"timer %u pending\n", T, pdp->T);
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seconds = osmo_tdef_get(sgsn->cfg.T_defs, T, OSMO_TDEF_S, -1);
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osmo_timer_schedule(&pdp->timer, seconds, 0);
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}
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static void pdpctx_timer_start(struct sgsn_pdp_ctx *pdp, unsigned int T)
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{
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if (osmo_timer_pending(&pdp->timer))
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LOGPDPCTXP(LOGL_ERROR, pdp, "Starting PDP timer %u while old "
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"timer %u pending\n", T, pdp->T);
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pdp->T = T;
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pdp->num_T_exp = 0;
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osmo_timer_setup(&pdp->timer, pdpctx_timer_cb, pdp);
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pdpctx_timer_rearm(pdp, pdp->T);
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}
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static void pdpctx_timer_stop(struct sgsn_pdp_ctx *pdp, unsigned int T)
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{
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if (pdp->T != T)
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LOGPDPCTXP(LOGL_ERROR, pdp, "Stopping PDP timer %u but "
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"%u is running\n", T, pdp->T);
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osmo_timer_del(&pdp->timer);
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}
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void pdp_ctx_detach_mm_ctx(struct sgsn_pdp_ctx *pdp)
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{
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/* Detach from MM context */
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llist_del(&pdp->list);
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pdp->mm = NULL;
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/* stop timer 3395 */
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pdpctx_timer_stop(pdp, 3395);
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}
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#if 0
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static void msgb_put_pdp_addr_ipv4(struct msgb *msg, uint32_t ipaddr)
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{
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uint8_t v[6];
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v[0] = PDP_TYPE_ORG_IETF;
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v[1] = PDP_TYPE_N_IETF_IPv4;
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*(uint32_t *)(v+2) = htonl(ipaddr);
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msgb_tlv_put(msg, GSM48_IE_GSM_PDP_ADDR, sizeof(v), v);
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}
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static void msgb_put_pdp_addr_ppp(struct msgb *msg)
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{
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uint8_t v[2];
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v[0] = PDP_TYPE_ORG_ETSI;
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v[1] = PDP_TYPE_N_ETSI_PPP;
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msgb_tlv_put(msg, GSM48_IE_GSM_PDP_ADDR, sizeof(v), v);
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}
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#endif
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/* Chapter 9.4.18 */
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static int _tx_status(struct msgb *msg, uint8_t cause,
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struct sgsn_mm_ctx *mmctx)
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{
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struct gsm48_hdr *gh;
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/* MMCTX might be NULL! */
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DEBUGP(DMM, "<- GPRS MM STATUS (cause: %s)\n",
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get_value_string(gsm48_gmm_cause_names, cause));
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gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1);
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gh->proto_discr = GSM48_PDISC_SM_GPRS;
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gh->msg_type = GSM48_MT_GSM_STATUS;
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gh->data[0] = cause;
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return gsm48_gmm_sendmsg(msg, 0, mmctx, true);
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}
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static int gsm48_tx_sm_status(struct sgsn_mm_ctx *mmctx, uint8_t cause)
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{
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struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 SM STATUS");
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mmctx2msgid(msg, mmctx);
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return _tx_status(msg, cause, mmctx);
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}
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/* 3GPP TS 24.008 § 9.5.2: Activate PDP Context Accept */
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int gsm48_tx_gsm_act_pdp_acc(struct sgsn_pdp_ctx *pdp)
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{
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struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 PDP ACC");
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struct gsm48_hdr *gh;
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uint8_t transaction_id = pdp->ti ^ 0x8; /* flip */
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LOGPDPCTXP(LOGL_INFO, pdp, "<- ACTIVATE PDP CONTEXT ACK\n");
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2021-06-04 15:27:03 +00:00
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rate_ctr_inc(rate_ctr_group_get_ctr(sgsn->rate_ctrs, CTR_PDP_ACTIVATE_ACCEPT));
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2019-09-02 16:27:27 +00:00
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mmctx2msgid(msg, pdp->mm);
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gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
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gh->proto_discr = GSM48_PDISC_SM_GPRS | (transaction_id << 4);
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gh->msg_type = GSM48_MT_GSM_ACT_PDP_ACK;
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/* Negotiated LLC SAPI */
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msgb_v_put(msg, pdp->sapi);
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/* FIXME: copy QoS parameters from original request */
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//msgb_lv_put(msg, pdp->lib->qos_neg.l, pdp->lib->qos_neg.v);
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msgb_lv_put(msg, sizeof(default_qos), (uint8_t *)&default_qos);
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/* Radio priority 10.5.7.2 */
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msgb_v_put(msg, pdp->lib->radio_pri);
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/* PDP address */
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/* Highest 4 bits of first byte need to be set to 1, otherwise
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* the IE is identical with the 04.08 PDP Address IE */
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pdp->lib->eua.v[0] &= ~0xf0;
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msgb_tlv_put(msg, GSM48_IE_GSM_PDP_ADDR,
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pdp->lib->eua.l, pdp->lib->eua.v);
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pdp->lib->eua.v[0] |= 0xf0;
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/* Optional: Protocol configuration options (FIXME: why 'req') */
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if (pdp->lib->pco_req.l)
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msgb_tlv_put(msg, GSM48_IE_GSM_PROTO_CONF_OPT,
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pdp->lib->pco_req.l, pdp->lib->pco_req.v);
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/* Optional: Packet Flow Identifier */
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return gsm48_gmm_sendmsg(msg, 0, pdp->mm, true);
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}
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/* 3GPP TS 24.008 § 9.5.3: Activate PDP Context reject */
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int gsm48_tx_gsm_act_pdp_rej(struct sgsn_mm_ctx *mm, uint8_t tid,
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uint8_t cause, uint8_t pco_len, uint8_t *pco_v)
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{
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struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 PDP REJ");
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struct gsm48_hdr *gh;
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uint8_t transaction_id = tid ^ 0x8; /* flip */
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LOGMMCTXP(LOGL_NOTICE, mm, "<- ACTIVATE PDP CONTEXT REJ: %s\n",
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get_value_string(gsm48_gsm_cause_names, cause));
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2021-06-04 15:27:03 +00:00
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rate_ctr_inc(rate_ctr_group_get_ctr(sgsn->rate_ctrs, CTR_PDP_ACTIVATE_REJECT));
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2019-09-02 16:27:27 +00:00
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mmctx2msgid(msg, mm);
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gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
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gh->proto_discr = GSM48_PDISC_SM_GPRS | (transaction_id << 4);
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gh->msg_type = GSM48_MT_GSM_ACT_PDP_REJ;
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msgb_v_put(msg, cause);
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if (pco_len && pco_v)
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msgb_tlv_put(msg, GSM48_IE_GSM_PROTO_CONF_OPT, pco_len, pco_v);
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return gsm48_gmm_sendmsg(msg, 0, mm, true);
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}
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/* 3GPP TS 24.008 § 9.5.8: Deactivate PDP Context Request */
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static int _gsm48_tx_gsm_deact_pdp_req(struct sgsn_mm_ctx *mm, uint8_t tid,
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uint8_t sm_cause, bool teardown)
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{
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struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 PDP DET REQ");
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struct gsm48_hdr *gh;
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uint8_t transaction_id = tid ^ 0x8; /* flip */
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uint8_t tear_down_ind = (0x9 << 4) | (!!teardown);
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LOGMMCTXP(LOGL_INFO, mm, "<- DEACTIVATE PDP CONTEXT REQ\n");
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2021-06-04 15:27:03 +00:00
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rate_ctr_inc(rate_ctr_group_get_ctr(sgsn->rate_ctrs, CTR_PDP_DL_DEACTIVATE_REQUEST));
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2019-09-02 16:27:27 +00:00
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mmctx2msgid(msg, mm);
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gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
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gh->proto_discr = GSM48_PDISC_SM_GPRS | (transaction_id << 4);
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gh->msg_type = GSM48_MT_GSM_DEACT_PDP_REQ;
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msgb_v_put(msg, sm_cause);
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msgb_v_put(msg, tear_down_ind);
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return gsm48_gmm_sendmsg(msg, 0, mm, true);
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}
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int gsm48_tx_gsm_deact_pdp_req(struct sgsn_pdp_ctx *pdp, uint8_t sm_cause, bool teardown)
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{
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pdpctx_timer_start(pdp, 3395);
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return _gsm48_tx_gsm_deact_pdp_req(pdp->mm, pdp->ti, sm_cause, teardown);
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}
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/* 3GPP TS 24.008 § 9.5.9: Deactivate PDP Context Accept */
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static int _gsm48_tx_gsm_deact_pdp_acc(struct sgsn_mm_ctx *mm, uint8_t tid)
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{
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struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 PDP DET ACC");
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struct gsm48_hdr *gh;
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uint8_t transaction_id = tid ^ 0x8; /* flip */
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LOGMMCTXP(LOGL_INFO, mm, "<- DEACTIVATE PDP CONTEXT ACK\n");
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2021-06-04 15:27:03 +00:00
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rate_ctr_inc(rate_ctr_group_get_ctr(sgsn->rate_ctrs, CTR_PDP_DL_DEACTIVATE_ACCEPT));
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2019-09-02 16:27:27 +00:00
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mmctx2msgid(msg, mm);
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gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
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gh->proto_discr = GSM48_PDISC_SM_GPRS | (transaction_id << 4);
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gh->msg_type = GSM48_MT_GSM_DEACT_PDP_ACK;
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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;
|
|
|
|
}
|
|
|
|
|
2023-01-05 18:39:01 +00:00
|
|
|
ggsn = sgsn_ggsn_ctx_alloc(sgsn, UINT32_MAX);
|
2019-09-02 16:27:27 +00:00
|
|
|
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) {
|
2019-09-06 19:34:31 +00:00
|
|
|
/* Make sure pdp ctx was not already torn down on GTP side */
|
|
|
|
if (!pdp->lib) {
|
|
|
|
gsm_cause = GSM_CAUSE_REACT_RQD;
|
|
|
|
goto no_context;
|
|
|
|
}
|
2019-09-02 16:27:27 +00:00
|
|
|
/* 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 */
|
2021-06-04 15:27:03 +00:00
|
|
|
rate_ctr_inc(rate_ctr_group_get_ctr(mmctx->ctrg, GMM_CTR_PDP_CTX_ACT));
|
2019-09-02 16:27:27 +00:00
|
|
|
|
|
|
|
/* 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;
|
|
|
|
|
2021-06-04 15:27:03 +00:00
|
|
|
rate_ctr_inc(rate_ctr_group_get_ctr(sgsn->rate_ctrs, CTR_PDP_ACTIVATE_REQUEST));
|
2019-09-02 16:27:27 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* 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]));
|
2021-06-04 15:27:03 +00:00
|
|
|
rate_ctr_inc(rate_ctr_group_get_ctr(sgsn->rate_ctrs, CTR_PDP_UL_DEACTIVATE_REQUEST));
|
2019-09-02 16:27:27 +00:00
|
|
|
|
|
|
|
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);
|
|
|
|
}
|
|
|
|
|
2020-10-19 14:38:25 +00:00
|
|
|
if (pdp->ggsn)
|
|
|
|
return sgsn_delete_pdp_ctx(pdp);
|
|
|
|
/* GTP side already detached, freeing */
|
|
|
|
sgsn_pdp_ctx_free(pdp);
|
|
|
|
return 0;
|
2019-09-02 16:27:27 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* 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");
|
2021-06-04 15:27:03 +00:00
|
|
|
rate_ctr_inc(rate_ctr_group_get_ctr(sgsn->rate_ctrs, CTR_PDP_UL_DEACTIVATE_ACCEPT));
|
2019-09-02 16:27:27 +00:00
|
|
|
|
|
|
|
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;
|
|
|
|
}
|