| /* 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) 2009-2010 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 <stdint.h> |
| #include <errno.h> |
| |
| #include <netinet/in.h> |
| #include <arpa/inet.h> |
| |
| #include <openbsc/db.h> |
| #include <osmocore/msgb.h> |
| #include <osmocore/tlv.h> |
| #include <osmocore/gsm_utils.h> |
| #include <osmocore/signal.h> |
| #include <osmocore/talloc.h> |
| |
| #include <openbsc/debug.h> |
| #include <openbsc/gsm_data.h> |
| #include <openbsc/gsm_subscriber.h> |
| #include <openbsc/gsm_04_08.h> |
| #include <openbsc/gsm_04_08_gprs.h> |
| #include <openbsc/paging.h> |
| #include <openbsc/transaction.h> |
| #include <openbsc/gprs_bssgp.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(uint8_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(uint8_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) |
| { |
| /* caller needs to provide TLLI, BVCI and NSEI */ |
| return gprs_llc_tx_ui(msg, GPRS_SAPI_GMM, command); |
| } |
| |
| /* copy identifiers from old message to new message, this |
| * is required so lower layers can route it correctly */ |
| static void gmm_copy_id(struct msgb *msg, const struct msgb *old) |
| { |
| msgb_tlli(msg) = msgb_tlli(old); |
| msgb_bvci(msg) = msgb_bvci(old); |
| msgb_nsei(msg) = msgb_nsei(old); |
| } |
| |
| static struct gsm48_qos default_qos = { |
| .delay_class = 4, /* best effort */ |
| .reliab_class = GSM48_QOS_RC_LLC_UN_RLC_ACK_DATA_PROT, |
| .peak_tput = GSM48_QOS_PEAK_TPUT_32000bps, |
| .preced_class = GSM48_QOS_PC_NORMAL, |
| .mean_tput = GSM48_QOS_MEAN_TPUT_BEST_EFFORT, |
| .traf_class = GSM48_QOS_TC_INTERACTIVE, |
| .deliv_order = GSM48_QOS_DO_UNORDERED, |
| .deliv_err_sdu = GSM48_QOS_ERRSDU_YES, |
| .max_sdu_size = GSM48_QOS_MAXSDU_1520, |
| .max_bitrate_up = GSM48_QOS_MBRATE_63k, |
| .max_bitrate_down = GSM48_QOS_MBRATE_63k, |
| .resid_ber = GSM48_QOS_RBER_5e_2, |
| .sdu_err_ratio = GSM48_QOS_SERR_1e_2, |
| .handling_prio = 3, |
| .xfer_delay = 0x10, /* 200ms */ |
| .guar_bitrate_up = GSM48_QOS_MBRATE_0k, |
| .guar_bitrate_down = GSM48_QOS_MBRATE_0k, |
| .sig_ind = 0, /* not optimised for signalling */ |
| .max_bitrate_down_ext = 0, /* use octet 9 */ |
| .guar_bitrate_down_ext = 0, /* use octet 13 */ |
| }; |
| |
| /* Chapter 9.4.2: Attach accept */ |
| static int gsm48_tx_gmm_att_ack(struct msgb *old_msg) |
| { |
| struct msgb *msg = gsm48_msgb_alloc(); |
| struct gsm48_hdr *gh; |
| struct gsm48_attach_ack *aa; |
| struct gprs_ra_id ra_id; |
| |
| DEBUGP(DMM, "<- GPRS ATTACH 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_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 */ |
| bssgp_parse_cell_id(&ra_id, msgb_bcid(old_msg)); |
| gsm48_construct_ra(aa->ra_id.digits, &ra_id); |
| |
| /* 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, uint8_t gmm_cause) |
| { |
| struct msgb *msg = gsm48_msgb_alloc(); |
| struct gsm48_hdr *gh; |
| |
| DEBUGP(DMM, "<- GPRS ATTACH REJECT\n"); |
| |
| gmm_copy_id(msg, old_msg); |
| |
| 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, uint8_t id_type) |
| { |
| struct msgb *msg = gsm48_msgb_alloc(); |
| struct gsm48_hdr *gh; |
| |
| DEBUGP(DMM, "-> GPRS IDENTITY REQUEST: mi_type=%02x\n", id_type); |
| |
| gmm_copy_id(msg, old_msg); |
| |
| 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); |
| uint8_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); |
| |
| bssgp_parse_cell_id(&ra_id, msgb_bcid(msg)); |
| 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); |
| uint8_t *cur = gh->data, *msnc, *mi, *old_ra_info; |
| uint8_t msnc_len, att_type, mi_len, mi_type; |
| uint16_t drx_par; |
| uint32_t tmsi; |
| char mi_string[GSM48_MI_SIZE]; |
| struct gprs_ra_id ra_id; |
| uint16_t cid; |
| 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. */ |
| |
| cid = bssgp_parse_cell_id(&ra_id, msgb_bcid(msg)); |
| |
| /* 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: |
| 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); |
| } |
| |
| /* 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); |
| } |
| |
| /* 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); |
| } |
| |
| /* 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; |
| 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\" ", 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); |
| } |
| |
| /* 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 */ |
| |
| 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; |
| } |
| |
| 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 */ |
| 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; |
| uint8_t transaction_id = ((old_gh->proto_discr >> 4) ^ 0x8); /* flip */ |
| |
| DEBUGP(DMM, "<- ACTIVATE PDP CONTEXT ACK\n"); |
| |
| gmm_copy_id(msg, old_msg); |
| |
| 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, req->req_llc_sapi); |
| /* copy QoS parameters from original request */ |
| msgb_lv_put(msg, sizeof(default_qos), (uint8_t *)&default_qos); |
| /* Radio priority 10.5.7.2 */ |
| msgb_v_put(msg, 4); |
| /* PDP address */ |
| msgb_put_pdp_addr_ipv4(msg, 0x01020304); |
| /* Optional: Protocol configuration options */ |
| /* Optional: Packet Flow Identifier */ |
| |
| 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; |
| uint8_t transaction_id = ((old_gh->proto_discr >> 4) ^ 0x8); /* flip */ |
| |
| DEBUGP(DMM, "<- DEACTIVATE PDP CONTEXT ACK\n"); |
| |
| gmm_copy_id(msg, old_msg); |
| |
| 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; |
| 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; |
| |
| DEBUGP(DMM, "ACTIVATE PDP CONTEXT REQ: "); |
| 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; |
| } |
| |
| /* FIXME: parse TLV for AP name and protocol config options */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_GSM_APN)) {} |
| if (TLVP_PRESENT(&tp, GSM48_IE_GSM_PROTO_CONF_OPT)) {} |
| |
| 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); |
| uint8_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; |
| } |