| /* 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 by Harald Welte <laforge@gnumonks.org> |
| * |
| * All Rights Reserved |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 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 General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <errno.h> |
| |
| #include <netinet/in.h> |
| |
| #include <openbsc/db.h> |
| #include <osmocore/msgb.h> |
| #include <osmocore/tlv.h> |
| #include <openbsc/debug.h> |
| #include <openbsc/gsm_data.h> |
| #include <osmocore/gsm_utils.h> |
| #include <openbsc/gsm_subscriber.h> |
| #include <openbsc/gsm_04_08.h> |
| #include <openbsc/gsm_04_08_gprs.h> |
| #include <openbsc/paging.h> |
| #include <osmocore/signal.h> |
| #include <osmocore/talloc.h> |
| #include <openbsc/transaction.h> |
| #include <openbsc/gprs_llc.h> |
| #include <openbsc/gprs_sgsn.h> |
| |
| /* 10.5.5.14 GPRS MM Cause / Table 10.5.147 */ |
| struct value_string gmm_cause_names[] = { |
| /* FIXME */ |
| { GMM_CAUSE_SEM_INCORR_MSG, "Semantically incorrect message" }, |
| { GMM_CAUSE_INV_MAND_INFO, "Invalid mandatory information" }, |
| { GMM_CAUSE_MSGT_NOTEXIST_NOTIMPL, |
| "Message type non-existant or not implemented" }, |
| { GMM_CAUSE_MSGT_INCOMP_P_STATE, |
| "Message type not compatible with protocol state" }, |
| { GMM_CAUSE_IE_NOTEXIST_NOTIMPL, |
| "Information element non-existent or not implemented" }, |
| { GMM_CAUSE_COND_IE_ERR, "Conditional IE error" }, |
| { GMM_CAUSE_MSG_INCOMP_P_STATE, |
| "Message not compatible with protocol state " }, |
| { GMM_CAUSE_PROTO_ERR_UNSPEC, "Protocol error, unspecified" }, |
| { 0, NULL } |
| }; |
| |
| /* 10.5.6.6 SM Cause / Table 10.5.157 */ |
| struct value_string gsm_cause_names[] = { |
| { GSM_CAUSE_INSUFF_RSRC, "Insufficient resources" }, |
| { GSM_CAUSE_MISSING_APN, "Missing or unknown APN" }, |
| { GSM_CAUSE_UNKNOWN_PDP, "Unknown PDP address or PDP type" }, |
| { GSM_CAUSE_AUTH_FAILED, "User Authentication failed" }, |
| { GSM_CAUSE_ACT_REJ_GGSN, "Activation rejected by GGSN" }, |
| { GSM_CAUSE_ACT_REJ_UNSPEC, "Activation rejected, unspecified" }, |
| { GSM_CAUSE_SERV_OPT_NOTSUPP, "Service option not supported" }, |
| { GSM_CAUSE_REQ_SERV_OPT_NOTSUB, |
| "Requested service option not subscribed" }, |
| { GSM_CAUSE_SERV_OPT_TEMP_OOO, |
| "Service option temporarily out of order" }, |
| { GSM_CAUSE_NSAPI_IN_USE, "NSAPI already used" }, |
| { GSM_CAUSE_DEACT_REGULAR, "Regular deactivation" }, |
| { GSM_CAUSE_QOS_NOT_ACCEPTED, "QoS not accepted" }, |
| { GSM_CAUSE_NET_FAIL, "Network Failure" }, |
| { GSM_CAUSE_REACT_RQD, "Reactivation required" }, |
| { GSM_CAUSE_FEATURE_NOTSUPP, "Feature not supported " }, |
| { GSM_CAUSE_INVALID_TRANS_ID, "Invalid transaction identifier" }, |
| { GSM_CAUSE_SEM_INCORR_MSG, "Semantically incorrect message" }, |
| { GSM_CAUSE_INV_MAND_INFO, "Invalid mandatory information" }, |
| { GSM_CAUSE_MSGT_NOTEXIST_NOTIMPL, |
| "Message type non-existant or not implemented" }, |
| { GSM_CAUSE_MSGT_INCOMP_P_STATE, |
| "Message type not compatible with protocol state" }, |
| { GSM_CAUSE_IE_NOTEXIST_NOTIMPL, |
| "Information element non-existent or not implemented" }, |
| { GSM_CAUSE_COND_IE_ERR, "Conditional IE error" }, |
| { GSM_CAUSE_MSG_INCOMP_P_STATE, |
| "Message not compatible with protocol state " }, |
| { GSM_CAUSE_PROTO_ERR_UNSPEC, "Protocol error, unspecified" }, |
| { 0, NULL } |
| }; |
| |
| static const char *att_name(u_int8_t type) |
| { |
| switch (type) { |
| case GPRS_ATT_T_ATTACH: |
| return "GPRS attach"; |
| case GPRS_ATT_T_ATT_WHILE_IMSI: |
| return "GPRS attach while IMSI attached"; |
| case GPRS_ATT_T_COMBINED: |
| return "Combined GPRS/IMSI attach"; |
| default: |
| return "unknown"; |
| } |
| } |
| |
| static const char *upd_name(u_int8_t type) |
| { |
| switch (type) { |
| case GPRS_UPD_T_RA: |
| return "RA updating"; |
| case GPRS_UPD_T_RA_LA: |
| return "combined RA/LA updating"; |
| case GPRS_UPD_T_RA_LA_IMSI_ATT: |
| return "combined RA/LA updating + IMSI attach"; |
| case GPRS_UPD_T_PERIODIC: |
| return "periodic updating"; |
| } |
| return "unknown"; |
| } |
| |
| /* Send a message through the underlying layer */ |
| static int gsm48_gmm_sendmsg(struct msgb *msg, int command) |
| { |
| return gprs_llc_tx_ui(msg, GPRS_SAPI_GMM, command); |
| } |
| |
| /* Chapter 9.4.2: Attach accept */ |
| static int gsm48_tx_gmm_att_ack(struct msgb *old_msg) |
| { |
| struct msgb *msg = gsm48_msgb_alloc(); |
| struct gsm48_hdr *gh; |
| struct gsm48_attach_ack *aa; |
| |
| DEBUGP(DMM, "<- GPRS ATTACH ACCEPT\n"); |
| |
| msgb_tlli(msg) = msgb_tlli(old_msg); |
| msg->trx = old_msg->trx; |
| |
| gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| gh->proto_discr = GSM48_PDISC_MM_GPRS; |
| gh->msg_type = GSM48_MT_GMM_ATTACH_ACK; |
| |
| aa = (struct gsm48_attach_ack *) msgb_put(msg, sizeof(*aa)); |
| aa->force_stby = 0; /* not indicated */ |
| aa->att_result = 1; /* GPRS only */ |
| aa->ra_upd_timer = GPRS_TMR_MINUTE | 10; |
| aa->radio_prio = 4; /* lowest */ |
| //FIXME gsm48_ra_id_by_bts(aa->ra_id.digits, old_msg->trx->bts); |
| |
| /* Option: P-TMSI signature, allocated P-TMSI, MS ID, ... */ |
| return gsm48_gmm_sendmsg(msg, 0); |
| } |
| |
| /* Chapter 9.4.5: Attach reject */ |
| static int gsm48_tx_gmm_att_rej(struct msgb *old_msg, u_int8_t gmm_cause) |
| { |
| struct msgb *msg = gsm48_msgb_alloc(); |
| struct gsm48_hdr *gh; |
| |
| DEBUGP(DMM, "<- GPRS ATTACH REJECT\n"); |
| |
| msgb_tlli(msg) = msgb_tlli(old_msg); |
| msg->trx = old_msg->trx; |
| |
| 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); |
| } |
| |
| /* Transmit Chapter 9.4.12 Identity Request */ |
| static int gsm48_tx_gmm_id_req(struct msgb *old_msg, u_int8_t id_type) |
| { |
| struct msgb *msg = gsm48_msgb_alloc(); |
| struct gsm48_hdr *gh; |
| |
| DEBUGP(DMM, "-> GPRS IDENTITY REQUEST: mi_type=%02x\n", id_type); |
| |
| msgb_tlli(msg) = msgb_tlli(old_msg); |
| msg->trx = old_msg->trx; |
| |
| 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, 0); |
| } |
| |
| /* Check if we can already authorize a subscriber */ |
| static int gsm48_gmm_authorize(struct sgsn_mm_ctx *ctx, struct msgb *msg) |
| { |
| if (strlen(ctx->imei) && strlen(ctx->imsi)) { |
| ctx->mm_state = GMM_REGISTERED_NORMAL; |
| return gsm48_tx_gmm_att_ack(msg); |
| } |
| if (!strlen(ctx->imei)) |
| return gsm48_tx_gmm_id_req(msg, GSM_MI_TYPE_IMEI); |
| |
| if (!strlen(ctx->imsi)) |
| return gsm48_tx_gmm_id_req(msg, GSM_MI_TYPE_IMSI); |
| |
| return 0; |
| } |
| |
| /* Parse Chapter 9.4.13 Identity Response */ |
| static int gsm48_rx_gmm_id_resp(struct msgb *msg) |
| { |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); |
| u_int8_t mi_type = gh->data[1] & GSM_MI_TYPE_MASK; |
| char mi_string[GSM48_MI_SIZE]; |
| struct gprs_ra_id ra_id; |
| struct sgsn_mm_ctx *ctx; |
| |
| gsm48_mi_to_string(mi_string, sizeof(mi_string), &gh->data[1], gh->data[0]); |
| DEBUGP(DMM, "GMM IDENTITY RESPONSE: mi_type=0x%02x MI(%s) ", |
| mi_type, mi_string); |
| |
| //FIXME gprs_ra_id_by_bts(&ra_id, msg->trx->bts); |
| ctx = sgsn_mm_ctx_by_tlli(msgb_tlli(msg), &ra_id); |
| if (!ctx) { |
| DEBUGP(DMM, "from unknown TLLI 0x%08x?!?\n", msgb_tlli(msg)); |
| return -EINVAL; |
| } |
| |
| 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 */ |
| strncpy(ctx->imsi, mi_string, sizeof(ctx->imei)); |
| break; |
| case GSM_MI_TYPE_IMEI: |
| strncpy(ctx->imei, mi_string, sizeof(ctx->imei)); |
| break; |
| case GSM_MI_TYPE_IMEISV: |
| break; |
| } |
| |
| DEBUGPC(DMM, "\n"); |
| /* Check if we can let the mobile station enter */ |
| return gsm48_gmm_authorize(ctx, msg); |
| } |
| |
| static void attach_rej_cb(void *data) |
| { |
| struct sgsn_mm_ctx *ctx = data; |
| |
| /* FIXME: determine through which BTS/TRX to send this */ |
| //gsm48_tx_gmm_att_rej(ctx->tlli, GMM_CAUSE_MS_ID_NOT_DERIVED); |
| ctx->mm_state = GMM_DEREGISTERED; |
| /* FIXME: release the context */ |
| } |
| |
| static void schedule_reject(struct sgsn_mm_ctx *ctx) |
| { |
| ctx->T = 3370; |
| ctx->timer.cb = attach_rej_cb; |
| ctx->timer.data = ctx; |
| bsc_schedule_timer(&ctx->timer, 6, 0); |
| } |
| |
| /* Section 9.4.1 Attach request */ |
| static int gsm48_rx_gmm_att_req(struct msgb *msg) |
| { |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); |
| u_int8_t *cur = gh->data, *msnc, *mi, *old_ra_info; |
| u_int8_t msnc_len, att_type, mi_len, mi_type; |
| u_int16_t drx_par; |
| u_int32_t tmsi; |
| char mi_string[GSM48_MI_SIZE]; |
| struct gprs_ra_id ra_id; |
| struct sgsn_mm_ctx *ctx; |
| |
| DEBUGP(DMM, "GMM 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. */ |
| |
| //FIXME gprs_ra_id_by_bts(&ra_id, msg->trx->bts); |
| |
| /* MS network capability 10.5.5.12 */ |
| msnc_len = *cur++; |
| msnc = cur; |
| if (msnc_len > 2) |
| goto err_inval; |
| cur += msnc_len; |
| |
| /* aTTACH Type 10.5.5.2 */ |
| att_type = *cur++ & 0x0f; |
| |
| /* DRX parameter 10.5.5.6 */ |
| drx_par = *cur++; |
| drx_par |= *cur++ << 8; |
| |
| /* 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, att_name(att_type)); |
| |
| /* Old routing area identification 10.5.5.15 */ |
| old_ra_info = cur; |
| cur += 6; |
| |
| /* MS Radio Access Capability 10.5.5.12a */ |
| |
| /* 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 */ |
| ctx = sgsn_mm_ctx_by_imsi(mi_string); |
| if (!ctx) { |
| #if 0 |
| return gsm48_tx_gmm_att_rej(msg, GMM_CAUSE_IMSI_UNKNOWN); |
| #else |
| /* As a temorary hack, we simply assume that the IMSI exists */ |
| ctx = sgsn_mm_ctx_alloc(0, &ra_id); |
| if (!ctx) |
| 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); |
| 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); |
| } |
| break; |
| default: |
| break; |
| } |
| |
| /* 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); |
| } |
| |
| /* 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; |
| |
| DEBUGP(DMM, "<- ROUTING AREA UPDATE ACCEPT\n"); |
| |
| msgb_tlli(msg) = msgb_tlli(old_msg); |
| msg->trx = old_msg->trx; |
| |
| 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; |
| //FIXME gsm48_ra_id_by_bts(rua->ra_id.digits, old_msg->trx->bts); |
| |
| /* Option: P-TMSI signature, allocated P-TMSI, MS ID, ... */ |
| return gsm48_gmm_sendmsg(msg, 0); |
| } |
| |
| /* Chapter 9.4.17: Routing area update reject */ |
| static int gsm48_tx_gmm_ra_upd_rej(struct msgb *old_msg, u_int8_t cause) |
| { |
| struct msgb *msg = gsm48_msgb_alloc(); |
| struct gsm48_hdr *gh; |
| |
| DEBUGP(DMM, "<- ROUTING AREA UPDATE REJECT\n"); |
| |
| msgb_tlli(msg) = msgb_tlli(old_msg); |
| msg->trx = old_msg->trx; |
| |
| 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); |
| } |
| |
| /* Chapter 9.4.14: Routing area update request */ |
| static int gsm48_rx_gmm_ra_upd_req(struct msgb *msg) |
| { |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); |
| struct sgsn_mm_ctx *mmctx; |
| u_int8_t *cur = gh->data; |
| struct gprs_ra_id old_ra_id; |
| u_int8_t upd_type; |
| |
| /* Update Type 10.5.5.18 */ |
| upd_type = *cur++ & 0x0f; |
| |
| DEBUGP(DMM, "GMM RA UPDATE REQUEST type=\"%s\" ", upd_name(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 */ |
| mmctx = sgsn_mm_ctx_by_tlli(msgb_tlli(msg), &old_ra_id); |
| 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); |
| } |
| |
| /* FIXME: Update the MM context with the new RA-ID */ |
| /* FIXME: Update the MM context with the new TLLI */ |
| /* FIXME: Update the MM context with the MS radio acc capabilities */ |
| /* FIXME: Update the MM context with the MS network capabilities */ |
| |
| DEBUGPC(DMM, " ACCEPT\n"); |
| return gsm48_tx_gmm_ra_upd_ack(msg); |
| } |
| |
| static int gsm48_rx_gmm_status(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 msgb *msg) |
| { |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); |
| int rc; |
| |
| switch (gh->msg_type) { |
| case GSM48_MT_GMM_RA_UPD_REQ: |
| rc = gsm48_rx_gmm_ra_upd_req(msg); |
| break; |
| case GSM48_MT_GMM_ATTACH_REQ: |
| rc = gsm48_rx_gmm_att_req(msg); |
| break; |
| case GSM48_MT_GMM_ID_RESP: |
| rc = gsm48_rx_gmm_id_resp(msg); |
| break; |
| case GSM48_MT_GMM_STATUS: |
| rc = gsm48_rx_gmm_status(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_DETACH_REQ: |
| 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); |
| break; |
| default: |
| DEBUGP(DMM, "Unknown GSM 04.08 GMM msg type 0x%02x\n", |
| gh->msg_type); |
| break; |
| } |
| |
| return rc; |
| } |
| |
| /* Section 9.5.2: Ativate PDP Context Accept */ |
| static int gsm48_tx_gsm_act_pdp_acc(struct msgb *old_msg, struct gsm48_act_pdp_ctx_req *req) |
| { |
| struct gsm48_hdr *old_gh = (struct gsm48_hdr *) msgb_gmmh(old_msg); |
| struct msgb *msg = gsm48_msgb_alloc(); |
| struct gsm48_act_pdp_ctx_ack *act_ack; |
| struct gsm48_hdr *gh; |
| u_int8_t transaction_id = ((old_gh->proto_discr >> 4) ^ 0x8); /* flip */ |
| |
| DEBUGP(DMM, "<- ACTIVATE PDP CONTEXT ACK\n"); |
| |
| msgb_tlli(msg) = msgb_tlli(old_msg); |
| msg->trx = old_msg->trx; |
| |
| 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; |
| act_ack = (struct gsm48_act_pdp_ctx_ack *) |
| msgb_put(msg, sizeof(*act_ack)); |
| act_ack->llc_sapi = req->req_llc_sapi; |
| memcpy(act_ack->qos_lv, req->req_qos_lv, sizeof(act_ack->qos_lv)); |
| //act_ack->radio_prio = 4; |
| |
| return gsm48_gmm_sendmsg(msg, 0); |
| } |
| |
| /* Section 9.5.9: Deactivate PDP Context Accept */ |
| static int gsm48_tx_gsm_deact_pdp_acc(struct msgb *old_msg) |
| { |
| struct gsm48_hdr *old_gh = (struct gsm48_hdr *) msgb_gmmh(old_msg); |
| struct msgb *msg = gsm48_msgb_alloc(); |
| struct gsm48_hdr *gh; |
| u_int8_t transaction_id = ((old_gh->proto_discr >> 4) ^ 0x8); /* flip */ |
| |
| DEBUGP(DMM, "<- DEACTIVATE PDP CONTEXT ACK\n"); |
| |
| msgb_tlli(msg) = msgb_tlli(old_msg); |
| msg->trx = old_msg->trx; |
| |
| 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); |
| } |
| |
| /* Section 9.5.1: Activate PDP Context Request */ |
| static int gsm48_rx_gsm_act_pdp_req(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; |
| u_int8_t *pdp_addr_lv = act_req->data; |
| |
| DEBUGP(DMM, "ACTIVATE PDP CONTEXT REQ\n"); |
| |
| /* FIXME: parse access point name + IPCP config options */ |
| |
| return gsm48_tx_gsm_act_pdp_acc(msg, act_req); |
| } |
| |
| /* Section 9.5.8: Deactivate PDP Context Request */ |
| static int gsm48_rx_gsm_deact_pdp_req(struct msgb *msg) |
| { |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); |
| |
| DEBUGP(DMM, "DEACTIVATE PDP CONTEXT REQ (cause: %s)\n", |
| get_value_string(gsm_cause_names, gh->data[0])); |
| |
| return gsm48_tx_gsm_deact_pdp_acc(msg); |
| } |
| |
| static int gsm48_rx_gsm_status(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 msgb *msg) |
| { |
| struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); |
| int rc; |
| |
| switch (gh->msg_type) { |
| case GSM48_MT_GSM_ACT_PDP_REQ: |
| rc = gsm48_rx_gsm_act_pdp_req(msg); |
| break; |
| case GSM48_MT_GSM_DEACT_PDP_REQ: |
| rc = gsm48_rx_gsm_deact_pdp_req(msg); |
| case GSM48_MT_GSM_STATUS: |
| rc = gsm48_rx_gsm_status(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); |
| u_int8_t pdisc = gh->proto_discr & 0x0f; |
| int rc = -EINVAL; |
| |
| switch (pdisc) { |
| case GSM48_PDISC_MM_GPRS: |
| rc = gsm0408_rcv_gmm(msg); |
| break; |
| case GSM48_PDISC_SM_GPRS: |
| rc = gsm0408_rcv_gsm(msg); |
| break; |
| default: |
| DEBUGP(DMM, "Unknown GSM 04.08 discriminator 0x%02x\n", |
| pdisc); |
| break; |
| } |
| |
| return rc; |
| } |
| |
| /* Determine the 'struct gsm_bts' from a RA ID */ |
| struct gsm_bts *gsm48_bts_by_ra_id(struct gsm_network *net, |
| const u_int8_t *buf, unsigned int len) |
| { |
| struct gprs_ra_id raid; |
| struct gsm_bts *bts; |
| |
| if (len < 6) |
| return NULL; |
| |
| gsm48_parse_ra(&raid, buf); |
| |
| if (net->country_code != raid.mcc || |
| net->network_code != raid.mnc) |
| return NULL; |
| |
| llist_for_each_entry(bts, &net->bts_list, list) { |
| /* FIXME: we actually also need to check the |
| * routing area code! */ |
| if (bts->location_area_code == raid.lac) |
| return bts; |
| } |
| |
| return NULL; |
| } |
| |