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osmo-msc/openbsc/src/gprs/gsm_04_08_gprs.c

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/* 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;
}
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