939 lines
27 KiB
C
939 lines
27 KiB
C
/* GSM Mobile Radio Interface Layer 3 messages on the A-bis interface
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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) 2009-2010 by Harald Welte <laforge@gnumonks.org>
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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 General Public License as published by
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* the Free Software Foundation; either version 2 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include <errno.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <openbsc/db.h>
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#include <osmocore/msgb.h>
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#include <osmocore/tlv.h>
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#include <osmocore/gsm_utils.h>
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#include <osmocore/signal.h>
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#include <osmocore/talloc.h>
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#include <osmocore/rate_ctr.h>
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#include <openbsc/debug.h>
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#include <openbsc/gsm_data.h>
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#include <openbsc/gsm_subscriber.h>
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#include <openbsc/gsm_04_08.h>
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#include <openbsc/gsm_04_08_gprs.h>
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#include <openbsc/paging.h>
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#include <openbsc/transaction.h>
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#include <openbsc/gprs_bssgp.h>
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#include <openbsc/gprs_llc.h>
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#include <openbsc/gprs_sgsn.h>
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#include <openbsc/gprs_gmm.h>
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#include <openbsc/sgsn.h>
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#include <pdp.h>
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extern struct sgsn_instance *sgsn;
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extern struct ggsn_ctx *dummy_ggsn;
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/* Protocol related stuff, should go into libosmocore */
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/* 10.5.5.14 GPRS MM Cause / Table 10.5.147 */
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const struct value_string gmm_cause_names[] = {
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/* FIXME */
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{ GMM_CAUSE_SEM_INCORR_MSG, "Semantically incorrect message" },
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{ GMM_CAUSE_INV_MAND_INFO, "Invalid mandatory information" },
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{ GMM_CAUSE_MSGT_NOTEXIST_NOTIMPL,
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"Message type non-existant or not implemented" },
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{ GMM_CAUSE_MSGT_INCOMP_P_STATE,
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"Message type not compatible with protocol state" },
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{ GMM_CAUSE_IE_NOTEXIST_NOTIMPL,
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"Information element non-existent or not implemented" },
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{ GMM_CAUSE_COND_IE_ERR, "Conditional IE error" },
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{ GMM_CAUSE_MSG_INCOMP_P_STATE,
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"Message not compatible with protocol state " },
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{ GMM_CAUSE_PROTO_ERR_UNSPEC, "Protocol error, unspecified" },
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{ 0, NULL }
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};
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/* 10.5.6.6 SM Cause / Table 10.5.157 */
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const struct value_string gsm_cause_names[] = {
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{ GSM_CAUSE_INSUFF_RSRC, "Insufficient resources" },
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{ GSM_CAUSE_MISSING_APN, "Missing or unknown APN" },
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{ GSM_CAUSE_UNKNOWN_PDP, "Unknown PDP address or PDP type" },
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{ GSM_CAUSE_AUTH_FAILED, "User Authentication failed" },
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{ GSM_CAUSE_ACT_REJ_GGSN, "Activation rejected by GGSN" },
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{ GSM_CAUSE_ACT_REJ_UNSPEC, "Activation rejected, unspecified" },
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{ GSM_CAUSE_SERV_OPT_NOTSUPP, "Service option not supported" },
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{ GSM_CAUSE_REQ_SERV_OPT_NOTSUB,
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"Requested service option not subscribed" },
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{ GSM_CAUSE_SERV_OPT_TEMP_OOO,
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"Service option temporarily out of order" },
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{ GSM_CAUSE_NSAPI_IN_USE, "NSAPI already used" },
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{ GSM_CAUSE_DEACT_REGULAR, "Regular deactivation" },
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{ GSM_CAUSE_QOS_NOT_ACCEPTED, "QoS not accepted" },
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{ GSM_CAUSE_NET_FAIL, "Network Failure" },
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{ GSM_CAUSE_REACT_RQD, "Reactivation required" },
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{ GSM_CAUSE_FEATURE_NOTSUPP, "Feature not supported " },
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{ GSM_CAUSE_INVALID_TRANS_ID, "Invalid transaction identifier" },
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{ GSM_CAUSE_SEM_INCORR_MSG, "Semantically incorrect message" },
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{ GSM_CAUSE_INV_MAND_INFO, "Invalid mandatory information" },
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{ GSM_CAUSE_MSGT_NOTEXIST_NOTIMPL,
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"Message type non-existant or not implemented" },
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{ GSM_CAUSE_MSGT_INCOMP_P_STATE,
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"Message type not compatible with protocol state" },
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{ GSM_CAUSE_IE_NOTEXIST_NOTIMPL,
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"Information element non-existent or not implemented" },
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{ GSM_CAUSE_COND_IE_ERR, "Conditional IE error" },
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{ GSM_CAUSE_MSG_INCOMP_P_STATE,
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"Message not compatible with protocol state " },
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{ GSM_CAUSE_PROTO_ERR_UNSPEC, "Protocol error, unspecified" },
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{ 0, NULL }
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};
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/* 10.5.5.2 */
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const struct value_string gprs_att_t_strs[] = {
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{ GPRS_ATT_T_ATTACH, "GPRS attach" },
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{ GPRS_ATT_T_ATT_WHILE_IMSI, "GPRS attach while IMSI attached" },
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{ GPRS_ATT_T_COMBINED, "Combined GPRS/IMSI attach" },
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{ 0, NULL }
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};
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const struct value_string gprs_upd_t_strs[] = {
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{ GPRS_UPD_T_RA, "RA updating" },
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{ GPRS_UPD_T_RA_LA, "combined RA/LA updating" },
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{ GPRS_UPD_T_RA_LA_IMSI_ATT, "combined RA/LA updating + IMSI attach" },
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{ GPRS_UPD_T_PERIODIC, "periodic updating" },
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{ 0, NULL }
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};
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/* 10.5.5.5 */
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const struct value_string gprs_det_t_mo_strs[] = {
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{ GPRS_DET_T_MO_GPRS, "GPRS detach" },
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{ GPRS_DET_T_MO_IMSI, "IMSI detach" },
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{ GPRS_DET_T_MO_COMBINED, "Combined GPRS/IMSI detach" },
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{ 0, NULL }
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};
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/* Our implementation, should be kept in SGSN */
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/* Send a message through the underlying layer */
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static int gsm48_gmm_sendmsg(struct msgb *msg, int command,
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const struct sgsn_mm_ctx *mm)
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{
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if (mm)
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rate_ctr_inc(&mm->ctrg->ctr[GMM_CTR_PKTS_SIG_OUT]);
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/* caller needs to provide TLLI, BVCI and NSEI */
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return gprs_llc_tx_ui(msg, GPRS_SAPI_GMM, command);
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}
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/* copy identifiers from old message to new message, this
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* is required so lower layers can route it correctly */
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static void gmm_copy_id(struct msgb *msg, const struct msgb *old)
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{
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msgb_tlli(msg) = msgb_tlli(old);
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msgb_bvci(msg) = msgb_bvci(old);
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msgb_nsei(msg) = msgb_nsei(old);
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}
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/* Store BVCI/NSEI in MM context */
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static void msgid2mmctx(struct sgsn_mm_ctx *mm, const struct msgb *msg)
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{
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mm->bvci = msgb_bvci(msg);
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mm->nsei = msgb_nsei(msg);
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}
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/* Store BVCI/NSEI in MM context */
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static void mmctx2msgid(struct msgb *msg, const struct sgsn_mm_ctx *mm)
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{
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msgb_tlli(msg) = mm->tlli;
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msgb_bvci(msg) = mm->bvci;
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msgb_nsei(msg) = mm->nsei;
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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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/* Chapter 9.4.2: Attach accept */
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static int gsm48_tx_gmm_att_ack(struct msgb *old_msg)
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{
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struct msgb *msg = gsm48_msgb_alloc();
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struct gsm48_hdr *gh;
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struct gsm48_attach_ack *aa;
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struct gprs_ra_id ra_id;
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DEBUGP(DMM, "<- GPRS ATTACH ACCEPT\n");
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gmm_copy_id(msg, old_msg);
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gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
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gh->proto_discr = GSM48_PDISC_MM_GPRS;
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gh->msg_type = GSM48_MT_GMM_ATTACH_ACK;
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aa = (struct gsm48_attach_ack *) msgb_put(msg, sizeof(*aa));
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aa->force_stby = 0; /* not indicated */
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aa->att_result = 1; /* GPRS only */
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aa->ra_upd_timer = GPRS_TMR_MINUTE | 10;
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aa->radio_prio = 4; /* lowest */
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bssgp_parse_cell_id(&ra_id, msgb_bcid(old_msg));
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gsm48_construct_ra(aa->ra_id.digits, &ra_id);
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/* Option: P-TMSI signature, allocated P-TMSI, MS ID, ... */
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return gsm48_gmm_sendmsg(msg, 0, NULL);
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}
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/* Chapter 9.4.5: Attach reject */
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static int gsm48_tx_gmm_att_rej(struct msgb *old_msg, uint8_t gmm_cause)
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{
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struct msgb *msg = gsm48_msgb_alloc();
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struct gsm48_hdr *gh;
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DEBUGP(DMM, "<- GPRS ATTACH REJECT\n");
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gmm_copy_id(msg, old_msg);
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gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1);
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gh->proto_discr = GSM48_PDISC_MM_GPRS;
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gh->msg_type = GSM48_MT_GMM_ATTACH_REJ;
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gh->data[0] = gmm_cause;
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return gsm48_gmm_sendmsg(msg, 0, NULL);
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}
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/* Chapter 9.4.6.2 Detach accept */
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static gsm48_tx_gmm_det_ack(struct msgb *old_msg, uint8_t force_stby)
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{
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struct msgb *msg = gsm48_msgb_alloc();
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struct gsm48_hdr *gh;
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DEBUGP(DMM, "<- GPRS DETACH ACCEPT\n");
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gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1);
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gh->proto_discr = GSM48_PDISC_MM_GPRS;
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gh->msg_type = GSM48_MT_GMM_DETACH_ACK;
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gh->data[0] = force_stby;
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return gsm48_gmm_sendmsg(msg, 0, NULL);
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}
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/* Transmit Chapter 9.4.12 Identity Request */
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static int gsm48_tx_gmm_id_req(struct msgb *old_msg, uint8_t id_type)
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{
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struct msgb *msg = gsm48_msgb_alloc();
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struct gsm48_hdr *gh;
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DEBUGP(DMM, "-> GPRS IDENTITY REQUEST: mi_type=%02x\n", id_type);
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gmm_copy_id(msg, old_msg);
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gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1);
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gh->proto_discr = GSM48_PDISC_MM_GPRS;
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gh->msg_type = GSM48_MT_GMM_ID_REQ;
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/* 10.5.5.9 ID type 2 + identity type and 10.5.5.7 'force to standby' IE */
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gh->data[0] = id_type & 0xf;
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return gsm48_gmm_sendmsg(msg, 0, NULL);
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}
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/* Check if we can already authorize a subscriber */
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static int gsm48_gmm_authorize(struct sgsn_mm_ctx *ctx, struct msgb *msg)
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{
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if (strlen(ctx->imei) && strlen(ctx->imsi)) {
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ctx->mm_state = GMM_REGISTERED_NORMAL;
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return gsm48_tx_gmm_att_ack(msg);
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}
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if (!strlen(ctx->imei))
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return gsm48_tx_gmm_id_req(msg, GSM_MI_TYPE_IMEI);
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if (!strlen(ctx->imsi))
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return gsm48_tx_gmm_id_req(msg, GSM_MI_TYPE_IMSI);
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return 0;
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}
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/* Parse Chapter 9.4.13 Identity Response */
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static int gsm48_rx_gmm_id_resp(struct sgsn_mm_ctx *ctx, struct msgb *msg)
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{
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struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg);
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uint8_t mi_type = gh->data[1] & GSM_MI_TYPE_MASK;
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char mi_string[GSM48_MI_SIZE];
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struct gprs_ra_id ra_id;
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gsm48_mi_to_string(mi_string, sizeof(mi_string), &gh->data[1], gh->data[0]);
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DEBUGP(DMM, "-> GMM IDENTITY RESPONSE: mi_type=0x%02x MI(%s) ",
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mi_type, mi_string);
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if (!ctx) {
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DEBUGP(DMM, "from unknown TLLI 0x%08x?!?\n", msgb_tlli(msg));
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return -EINVAL;
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}
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switch (mi_type) {
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case GSM_MI_TYPE_IMSI:
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/* we already have a mm context with current TLLI, but no
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* P-TMSI / IMSI yet. What we now need to do is to fill
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* this initial context with data from the HLR */
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strncpy(ctx->imsi, mi_string, sizeof(ctx->imei));
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break;
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case GSM_MI_TYPE_IMEI:
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strncpy(ctx->imei, mi_string, sizeof(ctx->imei));
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break;
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case GSM_MI_TYPE_IMEISV:
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break;
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}
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DEBUGPC(DMM, "\n");
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/* Check if we can let the mobile station enter */
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return gsm48_gmm_authorize(ctx, msg);
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}
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static void attach_rej_cb(void *data)
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{
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struct sgsn_mm_ctx *ctx = data;
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/* FIXME: determine through which BTS/TRX to send this */
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//gsm48_tx_gmm_att_rej(ctx->tlli, GMM_CAUSE_MS_ID_NOT_DERIVED);
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ctx->mm_state = GMM_DEREGISTERED;
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/* FIXME: release the context */
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}
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static void schedule_reject(struct sgsn_mm_ctx *ctx)
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{
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ctx->T = 3370;
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ctx->timer.cb = attach_rej_cb;
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ctx->timer.data = ctx;
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bsc_schedule_timer(&ctx->timer, 6, 0);
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}
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/* Section 9.4.1 Attach request */
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static int gsm48_rx_gmm_att_req(struct sgsn_mm_ctx *mmctx, struct msgb *msg)
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{
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struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg);
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uint8_t *cur = gh->data, *msnc, *mi, *old_ra_info;
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uint8_t msnc_len, att_type, mi_len, mi_type;
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uint16_t drx_par;
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uint32_t tmsi;
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char mi_string[GSM48_MI_SIZE];
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struct gprs_ra_id ra_id;
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uint16_t cid;
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struct sgsn_mm_ctx *ctx;
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DEBUGP(DMM, "-> GMM ATTACH REQUEST ");
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/* As per TS 04.08 Chapter 4.7.1.4, the attach request arrives either
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* with a foreign TLLI (P-TMSI that was allocated to the MS before),
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* or with random TLLI. */
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cid = bssgp_parse_cell_id(&ra_id, msgb_bcid(msg));
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/* MS network capability 10.5.5.12 */
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msnc_len = *cur++;
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msnc = cur;
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if (msnc_len > 2)
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goto err_inval;
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cur += msnc_len;
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/* aTTACH Type 10.5.5.2 */
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att_type = *cur++ & 0x0f;
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/* DRX parameter 10.5.5.6 */
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drx_par = *cur++;
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drx_par |= *cur++ << 8;
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/* Mobile Identity (P-TMSI or IMSI) 10.5.1.4 */
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mi_len = *cur++;
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mi = cur;
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if (mi_len > 8)
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goto err_inval;
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mi_type = *mi & GSM_MI_TYPE_MASK;
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cur += mi_len;
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gsm48_mi_to_string(mi_string, sizeof(mi_string), mi, mi_len);
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DEBUGPC(DMM, "MI(%s) type=\"%s\" ", mi_string,
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get_value_string(gprs_att_t_strs, att_type));
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/* Old routing area identification 10.5.5.15 */
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old_ra_info = cur;
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cur += 6;
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/* MS Radio Access Capability 10.5.5.12a */
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/* Optional: Old P-TMSI Signature, Requested READY timer, TMSI Status */
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switch (mi_type) {
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case GSM_MI_TYPE_IMSI:
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/* Try to find MM context based on IMSI */
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ctx = sgsn_mm_ctx_by_imsi(mi_string);
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if (!ctx) {
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#if 0
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return gsm48_tx_gmm_att_rej(msg, GMM_CAUSE_IMSI_UNKNOWN);
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#else
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/* As a temorary hack, we simply assume that the IMSI exists */
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ctx = sgsn_mm_ctx_alloc(0, &ra_id);
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if (!ctx)
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return gsm48_tx_gmm_att_rej(msg, GMM_CAUSE_NET_FAIL);
|
|
strncpy(ctx->imsi, mi_string, sizeof(ctx->imsi));
|
|
#endif
|
|
}
|
|
/* FIXME: Start some timer */
|
|
ctx->mm_state = GMM_COMMON_PROC_INIT;
|
|
ctx->tlli = msgb_tlli(msg);
|
|
msgid2mmctx(ctx, msg);
|
|
break;
|
|
case GSM_MI_TYPE_TMSI:
|
|
tmsi = strtoul(mi_string, NULL, 10);
|
|
/* Try to find MM context based on P-TMSI */
|
|
ctx = sgsn_mm_ctx_by_ptmsi(tmsi);
|
|
if (!ctx) {
|
|
ctx = sgsn_mm_ctx_alloc(msgb_tlli(msg), &ra_id);
|
|
/* FIXME: Start some timer */
|
|
ctx->mm_state = GMM_COMMON_PROC_INIT;
|
|
ctx->tlli = msgb_tlli(msg);
|
|
msgid2mmctx(ctx, msg);
|
|
}
|
|
break;
|
|
default:
|
|
return 0;
|
|
}
|
|
/* Update MM Context with currient RA and Cell ID */
|
|
ctx->ra = ra_id;
|
|
ctx->cell_id = cid;
|
|
|
|
/* FIXME: allocate a new P-TMSI (+ P-TMSI signature) */
|
|
/* FIXME: update the TLLI with the new local TLLI based on the P-TMSI */
|
|
|
|
DEBUGPC(DMM, "\n");
|
|
|
|
return ctx ? gsm48_gmm_authorize(ctx, msg) : 0;
|
|
|
|
err_inval:
|
|
DEBUGPC(DMM, "\n");
|
|
return gsm48_tx_gmm_att_rej(msg, GMM_CAUSE_SEM_INCORR_MSG);
|
|
}
|
|
|
|
/* Section 4.7.4.1 / 9.4.5.2 MO Detach request */
|
|
static int gsm48_rx_gmm_det_req(struct sgsn_mm_ctx *ctx, struct msgb *msg)
|
|
{
|
|
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg);
|
|
uint8_t detach_type, power_off;
|
|
|
|
detach_type = gh->data[0] & 0x7;
|
|
power_off = gh->data[0] & 0x8;
|
|
|
|
/* FIXME: In 24.008 there is an optional P-TMSI and P-TMSI signature IE */
|
|
|
|
DEBUGP(DMM, "-> GMM DETACH REQUEST TLLI=0x%08x type=%s %s\n",
|
|
msgb_tlli(msg), get_value_string(gprs_det_t_mo_strs, detach_type),
|
|
power_off ? "Power-off" : "");
|
|
|
|
/* Mark MM state as deregistered */
|
|
ctx->mm_state = GMM_DEREGISTERED;
|
|
|
|
/* force_stby = 0 */
|
|
return gsm48_tx_gmm_det_ack(msg, 0);
|
|
}
|
|
|
|
/* Chapter 9.4.15: Routing area update accept */
|
|
static int gsm48_tx_gmm_ra_upd_ack(struct msgb *old_msg)
|
|
{
|
|
struct msgb *msg = gsm48_msgb_alloc();
|
|
struct gsm48_hdr *gh;
|
|
struct gsm48_ra_upd_ack *rua;
|
|
struct gprs_ra_id ra_id;
|
|
|
|
DEBUGP(DMM, "<- ROUTING AREA UPDATE ACCEPT\n");
|
|
|
|
gmm_copy_id(msg, old_msg);
|
|
|
|
gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
|
|
gh->proto_discr = GSM48_PDISC_MM_GPRS;
|
|
gh->msg_type = GSM48_MT_GMM_RA_UPD_ACK;
|
|
|
|
rua = (struct gsm48_ra_upd_ack *) msgb_put(msg, sizeof(*rua));
|
|
rua->force_stby = 0; /* not indicated */
|
|
rua->upd_result = 0; /* RA updated */
|
|
rua->ra_upd_timer = GPRS_TMR_MINUTE | 10;
|
|
|
|
bssgp_parse_cell_id(&ra_id, msgb_bcid(old_msg));
|
|
gsm48_construct_ra(rua->ra_id.digits, &ra_id);
|
|
|
|
/* Option: P-TMSI signature, allocated P-TMSI, MS ID, ... */
|
|
return gsm48_gmm_sendmsg(msg, 0, NULL);
|
|
}
|
|
|
|
/* Chapter 9.4.17: Routing area update reject */
|
|
static int gsm48_tx_gmm_ra_upd_rej(struct msgb *old_msg, uint8_t cause)
|
|
{
|
|
struct msgb *msg = gsm48_msgb_alloc();
|
|
struct gsm48_hdr *gh;
|
|
|
|
DEBUGP(DMM, "<- ROUTING AREA UPDATE REJECT\n");
|
|
|
|
gmm_copy_id(msg, old_msg);
|
|
|
|
gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 2);
|
|
gh->proto_discr = GSM48_PDISC_MM_GPRS;
|
|
gh->msg_type = GSM48_MT_GMM_RA_UPD_REJ;
|
|
gh->data[0] = cause;
|
|
gh->data[1] = 0; /* ? */
|
|
|
|
/* Option: P-TMSI signature, allocated P-TMSI, MS ID, ... */
|
|
return gsm48_gmm_sendmsg(msg, 0, NULL);
|
|
}
|
|
|
|
/* 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 gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg);
|
|
uint8_t *cur = gh->data;
|
|
struct gprs_ra_id old_ra_id;
|
|
uint8_t upd_type;
|
|
|
|
/* Update Type 10.5.5.18 */
|
|
upd_type = *cur++ & 0x0f;
|
|
|
|
DEBUGP(DMM, "-> GMM RA UPDATE REQUEST type=\"%s\" ",
|
|
get_value_string(gprs_upd_t_strs, upd_type));
|
|
|
|
/* Old routing area identification 10.5.5.15 */
|
|
gsm48_parse_ra(&old_ra_id, cur);
|
|
cur += 6;
|
|
|
|
/* MS Radio Access Capability 10.5.5.12a */
|
|
|
|
/* Optional: Old P-TMSI Signature, Requested READY timer, TMSI Status,
|
|
* DRX parameter, MS network capability */
|
|
|
|
switch (upd_type) {
|
|
case GPRS_UPD_T_RA_LA:
|
|
case GPRS_UPD_T_RA_LA_IMSI_ATT:
|
|
DEBUGPC(DMM, " unsupported in Mode III, is your SI13 corrupt?\n");
|
|
return gsm48_tx_gmm_ra_upd_rej(msg, GMM_CAUSE_PROTO_ERR_UNSPEC);
|
|
break;
|
|
case GPRS_UPD_T_RA:
|
|
case GPRS_UPD_T_PERIODIC:
|
|
break;
|
|
}
|
|
|
|
/* Look-up the MM context based on old RA-ID and TLLI */
|
|
if (!mmctx || mmctx->mm_state == GMM_DEREGISTERED) {
|
|
/* The MS has to perform GPRS attach */
|
|
DEBUGPC(DMM, " REJECT\n");
|
|
return gsm48_tx_gmm_ra_upd_rej(msg, GMM_CAUSE_IMPL_DETACHED);
|
|
}
|
|
|
|
/* Update the MM context with the new RA-ID */
|
|
bssgp_parse_cell_id(&mmctx->ra, msgb_bcid(msg));
|
|
/* Update the MM context with the new TLLI */
|
|
mmctx->tlli = msgb_tlli(msg);
|
|
/* FIXME: Update the MM context with the MS radio acc capabilities */
|
|
/* FIXME: Update the MM context with the MS network capabilities */
|
|
|
|
rate_ctr_inc(&mmctx->ctrg->ctr[GMM_CTR_RA_UPDATE]);
|
|
|
|
DEBUGPC(DMM, " ACCEPT\n");
|
|
return gsm48_tx_gmm_ra_upd_ack(msg);
|
|
}
|
|
|
|
static int gsm48_rx_gmm_status(struct sgsn_mm_ctx *mmctx, struct msgb *msg)
|
|
{
|
|
struct gsm48_hdr *gh = msgb_l3(msg);
|
|
|
|
DEBUGP(DMM, "-> GPRS MM STATUS (cause: %s)\n",
|
|
get_value_string(gmm_cause_names, gh->data[0]));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* GPRS Mobility Management */
|
|
static int gsm0408_rcv_gmm(struct sgsn_mm_ctx *mmctx, struct msgb *msg)
|
|
{
|
|
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg);
|
|
int rc;
|
|
|
|
if (!mmctx &&
|
|
gh->msg_type != GSM48_MT_GMM_ATTACH_REQ &&
|
|
gh->msg_type != GSM48_MT_GMM_RA_UPD_REQ) {
|
|
LOGP(DMM, LOGL_NOTICE, "Cannot handle GMM for unknown MM CTX\n");
|
|
/* FIXME: Send GMM_CAUSE_IMPL_DETACHED */
|
|
return -EINVAL;
|
|
}
|
|
|
|
|
|
switch (gh->msg_type) {
|
|
case GSM48_MT_GMM_RA_UPD_REQ:
|
|
rc = gsm48_rx_gmm_ra_upd_req(mmctx, msg);
|
|
break;
|
|
case GSM48_MT_GMM_ATTACH_REQ:
|
|
rc = gsm48_rx_gmm_att_req(mmctx, msg);
|
|
break;
|
|
case GSM48_MT_GMM_ID_RESP:
|
|
rc = gsm48_rx_gmm_id_resp(mmctx, msg);
|
|
break;
|
|
case GSM48_MT_GMM_STATUS:
|
|
rc = gsm48_rx_gmm_status(mmctx, msg);
|
|
break;
|
|
case GSM48_MT_GMM_DETACH_REQ:
|
|
rc = gsm48_rx_gmm_det_req(mmctx, msg);
|
|
break;
|
|
case GSM48_MT_GMM_RA_UPD_COMPL:
|
|
/* only in case SGSN offered new P-TMSI */
|
|
case GSM48_MT_GMM_ATTACH_COMPL:
|
|
/* only in case SGSN offered new P-TMSI */
|
|
case GSM48_MT_GMM_PTMSI_REALL_COMPL:
|
|
case GSM48_MT_GMM_AUTH_CIPH_RESP:
|
|
DEBUGP(DMM, "Unimplemented GSM 04.08 GMM msg type 0x%02x\n",
|
|
gh->msg_type);
|
|
/* FIXME: Send GMM_CAUSE_MSGT_NOTEXIST_NOTIMPL */
|
|
break;
|
|
default:
|
|
DEBUGP(DMM, "Unknown GSM 04.08 GMM msg type 0x%02x\n",
|
|
gh->msg_type);
|
|
/* FIXME: Send GMM_CAUSE_MSGT_NOTEXIST_NOTIMPL */
|
|
break;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static void msgb_put_pdp_addr_ipv4(struct msgb *msg, uint32_t ipaddr)
|
|
{
|
|
uint8_t v[6];
|
|
|
|
v[0] = PDP_TYPE_ORG_IETF;
|
|
v[1] = PDP_TYPE_N_IETF_IPv4;
|
|
*(uint32_t *)(v+2) = htonl(ipaddr);
|
|
|
|
msgb_tlv_put(msg, GSM48_IE_GSM_PDP_ADDR, sizeof(v), v);
|
|
}
|
|
|
|
static void msgb_put_pdp_addr_ppp(struct msgb *msg)
|
|
{
|
|
uint8_t v[2];
|
|
|
|
v[0] = PDP_TYPE_ORG_ETSI;
|
|
v[1] = PDP_TYPE_N_ETSI_PPP;
|
|
|
|
msgb_tlv_put(msg, GSM48_IE_GSM_PDP_ADDR, sizeof(v), v);
|
|
}
|
|
|
|
/* Section 9.5.2: Ativate PDP Context Accept */
|
|
int gsm48_tx_gsm_act_pdp_acc(struct sgsn_pdp_ctx *pdp)
|
|
{
|
|
struct msgb *msg = gsm48_msgb_alloc();
|
|
struct gsm48_act_pdp_ctx_ack *act_ack;
|
|
struct gsm48_hdr *gh;
|
|
uint8_t transaction_id = pdp->ti ^ 0x8; /* flip */
|
|
|
|
DEBUGP(DMM, "<- ACTIVATE PDP CONTEXT ACK\n");
|
|
|
|
mmctx2msgid(msg, pdp->mm);
|
|
|
|
gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
|
|
gh->proto_discr = GSM48_PDISC_SM_GPRS | (transaction_id << 4);
|
|
gh->msg_type = GSM48_MT_GSM_ACT_PDP_ACK;
|
|
|
|
/* Negotiated LLC SAPI */
|
|
msgb_v_put(msg, pdp->sapi);
|
|
/* FIXME: copy QoS parameters from original request */
|
|
//msgb_lv_put(msg, pdp->lib->qos_neg.l, pdp->lib->qos_neg.v);
|
|
msgb_lv_put(msg, sizeof(default_qos), (uint8_t *)&default_qos);
|
|
/* Radio priority 10.5.7.2 */
|
|
msgb_v_put(msg, pdp->lib->radio_pri);
|
|
/* PDP address */
|
|
msgb_tlv_put(msg, GSM48_IE_GSM_PDP_ADDR,
|
|
pdp->lib->eua.l, pdp->lib->eua.v);
|
|
/* Optional: Protocol configuration options (FIXME: why 'req') */
|
|
if (pdp->lib->pco_req.l && pdp->lib->pco_req.v)
|
|
msgb_tlv_put(msg, GSM48_IE_GSM_PROTO_CONF_OPT,
|
|
pdp->lib->pco_neg.l, pdp->lib->pco_neg.v);
|
|
/* Optional: Packet Flow Identifier */
|
|
|
|
return gsm48_gmm_sendmsg(msg, 0, pdp->mm);
|
|
}
|
|
|
|
/* Section 9.5.3: Activate PDP Context reject */
|
|
int gsm48_tx_gsm_act_pdp_rej(struct sgsn_mm_ctx *mm, uint8_t tid,
|
|
uint8_t cause, uint8_t pco_len, uint8_t *pco_v)
|
|
{
|
|
struct msgb *msg = gsm48_msgb_alloc();
|
|
struct gsm48_act_pdp_ctx_ack *act_ack;
|
|
struct gsm48_hdr *gh;
|
|
uint8_t transaction_id = tid ^ 0x8; /* flip */
|
|
|
|
DEBUGP(DMM, "<- ACTIVATE PDP CONTEXT REJ(cause=%u)\n", cause);
|
|
|
|
mmctx2msgid(msg, mm);
|
|
|
|
gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
|
|
gh->proto_discr = GSM48_PDISC_SM_GPRS | (transaction_id << 4);
|
|
gh->msg_type = GSM48_MT_GSM_ACT_PDP_REJ;
|
|
|
|
msgb_v_put(msg, cause);
|
|
if (pco_len && pco_v)
|
|
msgb_tlv_put(msg, GSM48_IE_GSM_PROTO_CONF_OPT, pco_len, pco_v);
|
|
|
|
return gsm48_gmm_sendmsg(msg, 0, mm);
|
|
}
|
|
|
|
/* Section 9.5.9: Deactivate PDP Context Accept */
|
|
int gsm48_tx_gsm_deact_pdp_acc(struct sgsn_pdp_ctx *pdp)
|
|
{
|
|
struct msgb *msg = gsm48_msgb_alloc();
|
|
struct gsm48_hdr *gh;
|
|
uint8_t transaction_id = pdp->ti ^ 0x8; /* flip */
|
|
int rc;
|
|
|
|
DEBUGP(DMM, "<- DEACTIVATE PDP CONTEXT ACK\n");
|
|
|
|
mmctx2msgid(msg, pdp->mm);
|
|
|
|
gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
|
|
gh->proto_discr = GSM48_PDISC_SM_GPRS | (transaction_id << 4);
|
|
gh->msg_type = GSM48_MT_GSM_DEACT_PDP_ACK;
|
|
|
|
return gsm48_gmm_sendmsg(msg, 0, pdp->mm);
|
|
}
|
|
|
|
/* Section 9.5.1: Activate PDP Context Request */
|
|
static int gsm48_rx_gsm_act_pdp_req(struct sgsn_mm_ctx *mmctx,
|
|
struct msgb *msg)
|
|
{
|
|
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg);
|
|
struct gsm48_act_pdp_ctx_req *act_req = (struct gsm48_act_pdp_ctx_req *) gh->data;
|
|
uint8_t *pdp_addr_lv = act_req->data;
|
|
uint8_t req_qos_len, req_pdpa_len;
|
|
uint8_t *req_qos, *req_pdpa;
|
|
struct tlv_parsed tp;
|
|
uint8_t transaction_id = (gh->proto_discr >> 4);
|
|
struct sgsn_pdp_ctx *pdp;
|
|
|
|
DEBUGP(DMM, "-> ACTIVATE PDP CONTEXT REQ: SAPI=%u NSAPI=%u ",
|
|
act_req->req_llc_sapi, act_req->req_nsapi);
|
|
|
|
rate_ctr_inc(&mmctx->ctrg->ctr[GMM_CTR_PDP_CTX_ACT]);
|
|
|
|
req_qos_len = act_req->data[0];
|
|
req_qos = act_req->data + 1; /* 10.5.6.5 */
|
|
req_pdpa_len = act_req->data[1 + req_qos_len];
|
|
req_pdpa = act_req->data + 1 + req_qos_len + 1; /* 10.5.6.4 */
|
|
|
|
switch (req_pdpa[0] & 0xf) {
|
|
case 0x0:
|
|
DEBUGPC(DMM, "ETSI ");
|
|
break;
|
|
case 0x1:
|
|
DEBUGPC(DMM, "IETF ");
|
|
break;
|
|
case 0xf:
|
|
DEBUGPC(DMM, "Empty ");
|
|
break;
|
|
}
|
|
|
|
switch (req_pdpa[1]) {
|
|
case 0x21:
|
|
DEBUGPC(DMM, "IPv4 ");
|
|
if (req_pdpa_len >= 6) {
|
|
struct in_addr ia;
|
|
ia.s_addr = ntohl(*((uint32_t *) (req_pdpa+2)));
|
|
DEBUGPC(DMM, "%s ", inet_ntoa(ia));
|
|
}
|
|
break;
|
|
case 0x57:
|
|
DEBUGPC(DMM, "IPv6 ");
|
|
if (req_pdpa_len >= 18) {
|
|
/* FIXME: print IPv6 address */
|
|
}
|
|
break;
|
|
default:
|
|
DEBUGPC(DMM, "0x%02x ", req_pdpa[1]);
|
|
break;
|
|
}
|
|
|
|
DEBUGPC(DMM, "\n");
|
|
|
|
/* put the non-TLV elements in the TLV parser structure to
|
|
* pass them on to the SGSN / GTP code */
|
|
tp.lv[OSMO_IE_GSM_REQ_QOS].len = req_qos_len;
|
|
tp.lv[OSMO_IE_GSM_REQ_QOS].val = req_qos;
|
|
tp.lv[OSMO_IE_GSM_REQ_PDP_ADDR].len = req_pdpa_len;
|
|
tp.lv[OSMO_IE_GSM_REQ_PDP_ADDR].val = req_pdpa;
|
|
|
|
/* FIXME: determine GGSN based on APN and subscription options */
|
|
if (TLVP_PRESENT(&tp, GSM48_IE_GSM_APN)) {}
|
|
|
|
/* Check if NSAPI is out of range (TS 04.65 / 7.2) */
|
|
if (act_req->req_nsapi < 5 || act_req->req_nsapi > 15) {
|
|
/* Send reject with GSM_CAUSE_INV_MAND_INFO */
|
|
return gsm48_tx_gsm_act_pdp_rej(mmctx, transaction_id,
|
|
GSM_CAUSE_INV_MAND_INFO,
|
|
0, NULL);
|
|
}
|
|
|
|
/* Check if NSAPI is already in use */
|
|
if (sgsn_pdp_ctx_by_nsapi(mmctx, act_req->req_nsapi)) {
|
|
/* FIXME: 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 1
|
|
{
|
|
pdp = sgsn_create_pdp_ctx(dummy_ggsn, mmctx, act_req->req_nsapi, &tp);
|
|
if (!pdp)
|
|
return -1;
|
|
pdp->sapi = act_req->req_llc_sapi;
|
|
pdp->ti = transaction_id;
|
|
|
|
}
|
|
#else
|
|
return gsm48_tx_gsm_act_pdp_acc(mmctx, transaction_id, act_req);
|
|
#endif
|
|
}
|
|
|
|
/* Section 9.5.8: Deactivate PDP Context Request */
|
|
static int gsm48_rx_gsm_deact_pdp_req(struct sgsn_mm_ctx *mm, struct msgb *msg)
|
|
{
|
|
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg);
|
|
uint8_t transaction_id = (gh->proto_discr >> 4);
|
|
struct sgsn_pdp_ctx *pdp;
|
|
|
|
DEBUGP(DMM, "-> DEACTIVATE PDP CONTEXT REQ (cause: %s)\n",
|
|
get_value_string(gsm_cause_names, gh->data[0]));
|
|
|
|
pdp = sgsn_pdp_ctx_by_tid(mm, transaction_id);
|
|
if (!pdp) {
|
|
LOGP(DMM, LOGL_NOTICE, "Deactivate PDP Context Request for "
|
|
"non-existing PDP Context (IMSI=%s, TI=%u)\n",
|
|
mm->imsi, transaction_id);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return sgsn_delete_pdp_ctx(pdp);
|
|
}
|
|
|
|
static int gsm48_rx_gsm_status(struct sgsn_mm_ctx *ctx, struct msgb *msg)
|
|
{
|
|
struct gsm48_hdr *gh = msgb_l3(msg);
|
|
|
|
DEBUGP(DMM, "-> GPRS SM STATUS (cause: %s)\n",
|
|
get_value_string(gsm_cause_names, gh->data[0]));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* GPRS Session Management */
|
|
static int gsm0408_rcv_gsm(struct sgsn_mm_ctx *mmctx, struct msgb *msg)
|
|
{
|
|
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg);
|
|
int rc;
|
|
|
|
if (!mmctx) {
|
|
LOGP(DMM, LOGL_NOTICE, "Cannot handle SM for unknown MM CTX\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
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_STATUS:
|
|
rc = gsm48_rx_gsm_status(mmctx, msg);
|
|
break;
|
|
case GSM48_MT_GSM_REQ_PDP_ACT_REJ:
|
|
case GSM48_MT_GSM_ACT_AA_PDP_REQ:
|
|
case GSM48_MT_GSM_DEACT_AA_PDP_REQ:
|
|
DEBUGP(DMM, "Unimplemented GSM 04.08 GSM msg type 0x%02x\n",
|
|
gh->msg_type);
|
|
break;
|
|
default:
|
|
DEBUGP(DMM, "Unknown GSM 04.08 GSM msg type 0x%02x\n",
|
|
gh->msg_type);
|
|
break;
|
|
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* Main entry point for incoming 04.08 GPRS messages */
|
|
int gsm0408_gprs_rcvmsg(struct msgb *msg)
|
|
{
|
|
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg);
|
|
uint8_t pdisc = gh->proto_discr & 0x0f;
|
|
struct sgsn_mm_ctx *mmctx;
|
|
struct gprs_ra_id ra_id;
|
|
int rc = -EINVAL;
|
|
|
|
bssgp_parse_cell_id(&ra_id, msgb_bcid(msg));
|
|
mmctx = sgsn_mm_ctx_by_tlli(msgb_tlli(msg), &ra_id);
|
|
if (mmctx) {
|
|
msgid2mmctx(mmctx, msg);
|
|
rate_ctr_inc(&mmctx->ctrg->ctr[GMM_CTR_PKTS_SIG_IN]);
|
|
}
|
|
|
|
/* MMCTX can be NULL */
|
|
|
|
switch (pdisc) {
|
|
case GSM48_PDISC_MM_GPRS:
|
|
rc = gsm0408_rcv_gmm(mmctx, msg);
|
|
break;
|
|
case GSM48_PDISC_SM_GPRS:
|
|
rc = gsm0408_rcv_gsm(mmctx, msg);
|
|
break;
|
|
default:
|
|
DEBUGP(DMM, "Unknown GSM 04.08 discriminator 0x%02x\n",
|
|
pdisc);
|
|
/* FIXME: return status message */
|
|
break;
|
|
}
|
|
|
|
return rc;
|
|
}
|