paulmataruso/osmo-mgw
1
0
Fork 0
mirror of https://gitea.osmocom.org/cellular-infrastructure/osmo-mgw.git synced 2025-11-02 04:53:24 +00:00
Code Issues Packages Projects Releases Wiki Activity

gprs: Handle GMM service request (Iu mode only)

Browse Source 
Iu mode has a GMM service request message which a UE in PMM-IDLE mode
can use to switch back to PMM-CONNECTED mode.
This commit is contained in:
Daniel Willmann
2016-02-22 15:59:17 +01:00
committed by Neels Hofmeyr
parent 3acbc817f6
commit cba441f3de
3 changed files with 181 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
openbsc/include/openbsc/gsm_04_08_gprs.h
View File

@@ -17,6 +17,11 @@
#define GSM48_MT_GMM_RA_UPD_COMPL 0x0a
#define GSM48_MT_GMM_RA_UPD_REJ 0x0b
/* Table 10.4 in 3GPP TS 24.008 (successor to 04.08) */
#define GSM48_MT_GMM_SERVICE_REQ 0x0c
#define GSM48_MT_GMM_SERVICE_ACK 0x0d
#define GSM48_MT_GMM_SERVICE_REJ 0x0e
#define GSM48_MT_GMM_PTMSI_REALL_CMD 0x10
#define GSM48_MT_GMM_PTMSI_REALL_COMPL 0x11
#define GSM48_MT_GMM_AUTH_CIPH_REQ 0x12
@@ -393,5 +398,15 @@ struct gsm48_qos {
uint8_t guar_bitrate_down_ext;
};
/* 3GPP 24.008 / Chapter 10.5.5.20 / Table 10.5.153a */
enum gsm48_gmm_service_type {
GPRS_SERVICE_T_SIGNALLING = 0x00,
GPRS_SERVICE_T_DATA = 0x01,
GPRS_SERVICE_T_PAGING_RESP = 0x02,
GPRS_SERVICE_T_MBMS_MC_SERV = 0x03,
GPRS_SERVICE_T_MBMS_BC_SERV = 0x04,
};
extern const struct value_string *gprs_service_t_strs;
#endif /* _GSM48_GPRS_H */

156
openbsc/src/gprs/gprs_gmm.c
View File

@@ -1334,6 +1334,159 @@ rejected:
return rc;
}
/* Chapter 9.4.21: Service accept */
static int gsm48_tx_gmm_service_ack(struct sgsn_mm_ctx *mm)
{
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 SERVICE ACK");
struct gsm48_hdr *gh;
LOGMMCTXP(LOGL_INFO, mm, "<- GPRS SERVICE ACCEPT (P-TMSI=0x%08x)\n", mm->p_tmsi);
mmctx2msgid(msg, mm);
gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
gh->proto_discr = GSM48_PDISC_MM_GPRS;
gh->msg_type = GSM48_MT_GMM_SERVICE_ACK;
/* Optional: PDP context status */
/* Optional: MBMS context status */
return gsm48_gmm_sendmsg(msg, 0, mm);
}
/* Chapter 9.4.22: Service reject */
static int _tx_gmm_service_rej(struct msgb *msg, uint8_t gmm_cause,
const struct sgsn_mm_ctx *mm)
{
struct gsm48_hdr *gh;
LOGMMCTXP(LOGL_NOTICE, mm, "<- GPRS SERVICE REJECT: %s\n",
get_value_string(gsm48_gmm_cause_names, gmm_cause));
gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1);
gh->proto_discr = GSM48_PDISC_MM_GPRS;
gh->msg_type = GSM48_MT_GMM_SERVICE_REJ;
gh->data[0] = gmm_cause;
return gsm48_gmm_sendmsg(msg, 0, NULL);
}
static int gsm48_tx_gmm_service_rej_oldmsg(const struct msgb *old_msg,
uint8_t gmm_cause)
{
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 SERVICE REJ OLD");
gmm_copy_id(msg, old_msg);
return _tx_gmm_service_rej(msg, gmm_cause, NULL);
}
static int gsm48_tx_gmm_service_rej(struct sgsn_mm_ctx *mm,
uint8_t gmm_cause)
{
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 SERVICE REJ");
mmctx2msgid(msg, mm);
return _tx_gmm_service_rej(msg, gmm_cause, mm);
}
/* 3GPP TS 24.008 Section 9.4.20 Service request */
static int gsm48_rx_gmm_service_req(struct sgsn_mm_ctx *ctx, struct msgb *msg)
{
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg);
uint8_t *cur = gh->data, *mi;
uint8_t ciph_seq_nr, service_type, mi_len, mi_type;
uint32_t tmsi;
struct tlv_parsed tp;
char mi_string[GSM48_MI_SIZE];
uint16_t cid = 0;
enum gsm48_gmm_cause reject_cause;
int rc;
LOGMMCTXP(LOGL_INFO, ctx, "-> GMM SERVICE REQUEST ");
/* This message is only valid in Iu mode */
if (!msg->dst)
return -1;
/* Skip Ciphering key sequence number 10.5.1.2 */
ciph_seq_nr = *cur & 0x07;
/* Service type 10.5.5.20 */
service_type = (*cur++ >> 4) & 0x07;
/* 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,
get_value_string(gprs_service_t_strs, service_type));
LOGPC(DMM, LOGL_INFO, "\n");
/* Optional: PDP context status, MBMS context status, Uplink data status, Device properties */
tlv_parse(&tp, &gsm48_gmm_att_tlvdef, cur, (msg->data + msg->len) - cur, 0, 0);
switch (mi_type) {
case GSM_MI_TYPE_IMSI:
/* Try to find MM context based on IMSI */
if (!ctx)
ctx = sgsn_mm_ctx_by_imsi(mi_string);
if (!ctx) {
/* FIXME: We need to have a context for service request? */
reject_cause = GMM_CAUSE_NET_FAIL;
goto rejected;
}
msgid2mmctx(ctx, msg);
break;
case GSM_MI_TYPE_TMSI:
memcpy(&tmsi, mi+1, 4);
tmsi = ntohl(tmsi);
/* Try to find MM context based on P-TMSI */
if (!ctx)
ctx = sgsn_mm_ctx_by_ptmsi(tmsi);
if (!ctx) {
/* FIXME: We need to have a context for service request? */
reject_cause = GMM_CAUSE_NET_FAIL;
goto rejected;
}
msgid2mmctx(ctx, msg);
break;
default:
LOGMMCTXP(LOGL_NOTICE, ctx, "Rejecting SERVICE REQUEST with "
"MI type %s\n", gsm48_mi_type_name(mi_type));
reject_cause = GMM_CAUSE_MS_ID_NOT_DERIVED;
goto rejected;
}
/* Look at PDP Context Status IE and see if MS's view of
* activated/deactivated NSAPIs agrees with our view */
if (TLVP_PRESENT(&tp, GSM48_IE_GMM_PDP_CTX_STATUS)) {
const uint8_t *pdp_status = TLVP_VAL(&tp, GSM48_IE_GMM_PDP_CTX_STATUS);
process_ms_ctx_status(ctx, pdp_status);
}
ctx->pending_req = GSM48_MT_GMM_SERVICE_REQ;
return gsm48_gmm_authorize(ctx);
err_inval:
LOGPC(DMM, LOGL_INFO, "\n");
reject_cause = GMM_CAUSE_SEM_INCORR_MSG;
rejected:
/* Send SERVICE REJECT */
LOGMMCTXP(LOGL_NOTICE, ctx,
"Rejecting Service Request with cause '%s' (%d)\n",
get_value_string(gsm48_gmm_cause_names, reject_cause), reject_cause);
rc = gsm48_tx_gmm_service_rej_oldmsg(msg, reject_cause);
return rc;
}
static int gsm48_rx_gmm_status(struct sgsn_mm_ctx *mmctx, struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
@@ -1402,6 +1555,9 @@ static int gsm0408_rcv_gmm(struct sgsn_mm_ctx *mmctx, struct msgb *msg,
case GSM48_MT_GMM_ATTACH_REQ:
rc = gsm48_rx_gmm_att_req(mmctx, msg, llme);
break;
case GSM48_MT_GMM_SERVICE_REQ:
rc = gsm48_rx_gmm_service_req(mmctx, msg);
break;
default:
break;
}

10
openbsc/src/gprs/gsm_04_08_gprs.c
View File

@@ -139,3 +139,13 @@ const struct value_string gprs_det_t_mt_strs_[] = {
const struct value_string *gprs_det_t_mt_strs = gprs_det_t_mt_strs_;
const struct value_string gprs_service_t_strs_[] = {
{ GPRS_SERVICE_T_SIGNALLING, "signalling" },
{ GPRS_SERVICE_T_DATA, "data" },
{ GPRS_SERVICE_T_PAGING_RESP, "paging response" },
{ GPRS_SERVICE_T_MBMS_MC_SERV, "MBMS multicast service" },
{ GPRS_SERVICE_T_MBMS_BC_SERV, "MBMS broadcast service" },
{ 0, NULL }
};
const struct value_string *gprs_service_t_strs = gprs_service_t_strs_;