642 lines
18 KiB
C
642 lines
18 KiB
C
/* GPRS SGSN integration with libgtp of OpenGGSN */
|
|
/* libgtp implements the GPRS Tunelling Protocol GTP per TS 09.60 / 29.060 */
|
|
|
|
/* (C) 2010 by Harald Welte <laforge@gnumonks.org>
|
|
* (C) 2010 by On-Waves
|
|
* All Rights Reserved
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU Affero General Public License as published by
|
|
* the Free Software Foundation; either version 3 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 Affero General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Affero General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
*/
|
|
|
|
#include <unistd.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <getopt.h>
|
|
#include <errno.h>
|
|
#include <signal.h>
|
|
#include <sys/fcntl.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/socket.h>
|
|
#include <netinet/in.h>
|
|
#include <arpa/inet.h>
|
|
|
|
#include <osmocom/core/talloc.h>
|
|
#include <osmocom/core/select.h>
|
|
#include <osmocom/core/rate_ctr.h>
|
|
#include <osmocom/gprs/gprs_bssgp.h>
|
|
|
|
#include <openbsc/gsm_04_08_gprs.h>
|
|
#include <openbsc/signal.h>
|
|
#include <openbsc/debug.h>
|
|
#include <openbsc/sgsn.h>
|
|
#include <openbsc/gprs_llc.h>
|
|
#include <openbsc/gprs_sgsn.h>
|
|
#include <openbsc/gprs_gmm.h>
|
|
|
|
#include <gtp.h>
|
|
#include <pdp.h>
|
|
|
|
const struct value_string gtp_cause_strs[] = {
|
|
{ GTPCAUSE_REQ_IMSI, "Request IMSI" },
|
|
{ GTPCAUSE_REQ_IMEI, "Request IMEI" },
|
|
{ GTPCAUSE_REQ_IMSI_IMEI, "Request IMSI and IMEI" },
|
|
{ GTPCAUSE_NO_ID_NEEDED, "No identity needed" },
|
|
{ GTPCAUSE_MS_REFUSES_X, "MS refuses" },
|
|
{ GTPCAUSE_MS_NOT_RESP_X, "MS is not GPRS responding" },
|
|
{ GTPCAUSE_ACC_REQ, "Request accepted" },
|
|
{ GTPCAUSE_NON_EXIST, "Non-existent" },
|
|
{ GTPCAUSE_INVALID_MESSAGE, "Invalid message format" },
|
|
{ GTPCAUSE_IMSI_NOT_KNOWN, "IMSI not known" },
|
|
{ GTPCAUSE_MS_DETACHED, "MS is GPRS detached" },
|
|
{ GTPCAUSE_MS_NOT_RESP, "MS is not GPRS responding" },
|
|
{ GTPCAUSE_MS_REFUSES, "MS refuses" },
|
|
{ GTPCAUSE_NO_RESOURCES, "No resources available" },
|
|
{ GTPCAUSE_NOT_SUPPORTED, "Service not supported" },
|
|
{ GTPCAUSE_MAN_IE_INCORRECT, "Mandatory IE incorrect" },
|
|
{ GTPCAUSE_MAN_IE_MISSING, "Mandatory IE missing" },
|
|
{ GTPCAUSE_OPT_IE_INCORRECT, "Optional IE incorrect" },
|
|
{ GTPCAUSE_SYS_FAIL, "System failure" },
|
|
{ GTPCAUSE_ROAMING_REST, "Roaming restrictions" },
|
|
{ GTPCAUSE_PTIMSI_MISMATCH, "P-TMSI Signature mismatch" },
|
|
{ GTPCAUSE_CONN_SUSP, "GPRS connection suspended" },
|
|
{ GTPCAUSE_AUTH_FAIL, "Authentication failure" },
|
|
{ GTPCAUSE_USER_AUTH_FAIL, "User authentication failed" },
|
|
{ GTPCAUSE_CONTEXT_NOT_FOUND, "Context not found" },
|
|
{ GTPCAUSE_ADDR_OCCUPIED, "All dynamic PDP addresses occupied" },
|
|
{ GTPCAUSE_NO_MEMORY, "No memory is available" },
|
|
{ GTPCAUSE_RELOC_FAIL, "Relocation failure" },
|
|
{ GTPCAUSE_UNKNOWN_MAN_EXTHEADER, "Unknown mandatory ext. header" },
|
|
{ GTPCAUSE_SEM_ERR_TFT, "Semantic error in TFT operation" },
|
|
{ GTPCAUSE_SYN_ERR_TFT, "Syntactic error in TFT operation" },
|
|
{ GTPCAUSE_SEM_ERR_FILTER, "Semantic errors in packet filter" },
|
|
{ GTPCAUSE_SYN_ERR_FILTER, "Syntactic errors in packet filter" },
|
|
{ GTPCAUSE_MISSING_APN, "Missing or unknown APN" },
|
|
{ GTPCAUSE_UNKNOWN_PDP, "Unknown PDP address or PDP type" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
/* Generate the GTP IMSI IE according to 09.60 Section 7.9.2 */
|
|
static uint64_t imsi_str2gtp(char *str)
|
|
{
|
|
uint64_t imsi64 = 0;
|
|
unsigned int n;
|
|
unsigned int imsi_len = strlen(str);
|
|
|
|
if (imsi_len > 16) {
|
|
LOGP(DGPRS, LOGL_NOTICE, "IMSI length > 16 not supported!\n");
|
|
return 0;
|
|
}
|
|
|
|
for (n = 0; n < 16; n++) {
|
|
uint64_t val;
|
|
if (n < imsi_len)
|
|
val = (str[n]-'0') & 0xf;
|
|
else
|
|
val = 0xf;
|
|
imsi64 |= (val << (n*4));
|
|
}
|
|
return imsi64;
|
|
}
|
|
|
|
/* generate a PDP context based on the IE's from the 04.08 message,
|
|
* and send the GTP create pdp context request to the GGSN */
|
|
struct sgsn_pdp_ctx *sgsn_create_pdp_ctx(struct sgsn_ggsn_ctx *ggsn,
|
|
struct sgsn_mm_ctx *mmctx,
|
|
uint16_t nsapi,
|
|
struct tlv_parsed *tp)
|
|
{
|
|
struct sgsn_pdp_ctx *pctx;
|
|
struct pdp_t *pdp;
|
|
uint64_t imsi_ui64;
|
|
int rc;
|
|
|
|
LOGP(DGPRS, LOGL_ERROR, "Create PDP Context\n");
|
|
pctx = sgsn_pdp_ctx_alloc(mmctx, nsapi);
|
|
if (!pctx) {
|
|
LOGP(DGPRS, LOGL_ERROR, "Couldn't allocate PDP Ctx\n");
|
|
return NULL;
|
|
}
|
|
|
|
imsi_ui64 = imsi_str2gtp(mmctx->imsi);
|
|
|
|
rc = pdp_newpdp(&pdp, imsi_ui64, nsapi, NULL);
|
|
if (rc) {
|
|
LOGP(DGPRS, LOGL_ERROR, "Out of libgtp PDP Contexts\n");
|
|
return NULL;
|
|
}
|
|
pdp->priv = pctx;
|
|
pctx->lib = pdp;
|
|
pctx->ggsn = ggsn;
|
|
|
|
//pdp->peer = /* sockaddr_in of GGSN (receive) */
|
|
//pdp->ipif = /* not used by library */
|
|
pdp->version = ggsn->gtp_version;
|
|
pdp->hisaddr0 = ggsn->remote_addr;
|
|
pdp->hisaddr1 = ggsn->remote_addr;
|
|
//pdp->cch_pdp = 512; /* Charging Flat Rate */
|
|
|
|
/* MS provided APN, subscription not verified */
|
|
pdp->selmode = 0x01;
|
|
|
|
/* IMSI, TEID/TEIC, FLLU/FLLC, TID, NSAPI set in pdp_newpdp */
|
|
|
|
/* FIXME: MSISDN in BCD format from mmctx */
|
|
//pdp->msisdn.l/.v
|
|
|
|
/* End User Address from GMM requested PDP address */
|
|
pdp->eua.l = TLVP_LEN(tp, OSMO_IE_GSM_REQ_PDP_ADDR);
|
|
if (pdp->eua.l > sizeof(pdp->eua.v))
|
|
pdp->eua.l = sizeof(pdp->eua.v);
|
|
memcpy(pdp->eua.v, TLVP_VAL(tp, OSMO_IE_GSM_REQ_PDP_ADDR),
|
|
pdp->eua.l);
|
|
/* Highest 4 bits of first byte need to be set to 1, otherwise
|
|
* the IE is identical with the 04.08 PDP Address IE */
|
|
pdp->eua.v[0] |= 0xf0;
|
|
|
|
/* APN name from GMM */
|
|
pdp->apn_use.l = TLVP_LEN(tp, GSM48_IE_GSM_APN);
|
|
if (pdp->apn_use.l > sizeof(pdp->apn_use.v))
|
|
pdp->apn_use.l = sizeof(pdp->apn_use.v);
|
|
memcpy(pdp->apn_use.v, TLVP_VAL(tp, GSM48_IE_GSM_APN),
|
|
pdp->apn_use.l);
|
|
|
|
/* Protocol Configuration Options from GMM */
|
|
pdp->pco_req.l = TLVP_LEN(tp, GSM48_IE_GSM_PROTO_CONF_OPT);
|
|
if (pdp->pco_req.l > sizeof(pdp->pco_req.v))
|
|
pdp->pco_req.l = sizeof(pdp->pco_req.v);
|
|
memcpy(pdp->pco_req.v, TLVP_VAL(tp, GSM48_IE_GSM_PROTO_CONF_OPT),
|
|
pdp->pco_req.l);
|
|
|
|
/* QoS options from GMM */
|
|
pdp->qos_req.l = TLVP_LEN(tp, OSMO_IE_GSM_REQ_QOS);
|
|
if (pdp->qos_req.l > sizeof(pdp->qos_req.v))
|
|
pdp->qos_req.l = sizeof(pdp->qos_req.v);
|
|
memcpy(pdp->qos_req.v, TLVP_VAL(tp, OSMO_IE_GSM_REQ_QOS),
|
|
pdp->qos_req.l);
|
|
|
|
/* SGSN address for control plane */
|
|
pdp->gsnlc.l = sizeof(sgsn->cfg.gtp_listenaddr.sin_addr);
|
|
memcpy(pdp->gsnlc.v, &sgsn->cfg.gtp_listenaddr.sin_addr,
|
|
sizeof(sgsn->cfg.gtp_listenaddr.sin_addr));
|
|
|
|
/* SGSN address for user plane */
|
|
pdp->gsnlu.l = sizeof(sgsn->cfg.gtp_listenaddr.sin_addr);
|
|
memcpy(pdp->gsnlu.v, &sgsn->cfg.gtp_listenaddr.sin_addr,
|
|
sizeof(sgsn->cfg.gtp_listenaddr.sin_addr));
|
|
|
|
/* change pdp state to 'requested' */
|
|
pctx->state = PDP_STATE_CR_REQ;
|
|
|
|
rc = gtp_create_context_req(ggsn->gsn, pdp, pctx);
|
|
/* FIXME */
|
|
|
|
return pctx;
|
|
}
|
|
|
|
/* SGSN wants to delete a PDP context */
|
|
int sgsn_delete_pdp_ctx(struct sgsn_pdp_ctx *pctx)
|
|
{
|
|
LOGPDPCTXP(LOGL_ERROR, pctx, "Delete PDP Context\n");
|
|
|
|
/* FIXME: decide if we need teardown or not ! */
|
|
return gtp_delete_context_req(pctx->ggsn->gsn, pctx->lib, pctx, 1);
|
|
}
|
|
|
|
struct cause_map {
|
|
uint8_t cause_in;
|
|
uint8_t cause_out;
|
|
};
|
|
|
|
static uint8_t cause_map(const struct cause_map *map, uint8_t in, uint8_t deflt)
|
|
{
|
|
const struct cause_map *m;
|
|
|
|
for (m = map; m->cause_in && m->cause_out; m++) {
|
|
if (m->cause_in == in)
|
|
return m->cause_out;
|
|
}
|
|
return deflt;
|
|
}
|
|
|
|
/* how do we map from gtp cause to SM cause */
|
|
static const struct cause_map gtp2sm_cause_map[] = {
|
|
{ GTPCAUSE_NO_RESOURCES, GSM_CAUSE_INSUFF_RSRC },
|
|
{ GTPCAUSE_NOT_SUPPORTED, GSM_CAUSE_SERV_OPT_NOTSUPP },
|
|
{ GTPCAUSE_MAN_IE_INCORRECT, GSM_CAUSE_INV_MAND_INFO },
|
|
{ GTPCAUSE_MAN_IE_MISSING, GSM_CAUSE_INV_MAND_INFO },
|
|
{ GTPCAUSE_OPT_IE_INCORRECT, GSM_CAUSE_PROTO_ERR_UNSPEC },
|
|
{ GTPCAUSE_SYS_FAIL, GSM_CAUSE_NET_FAIL },
|
|
{ GTPCAUSE_ROAMING_REST, GSM_CAUSE_REQ_SERV_OPT_NOTSUB },
|
|
{ GTPCAUSE_PTIMSI_MISMATCH, GSM_CAUSE_PROTO_ERR_UNSPEC },
|
|
{ GTPCAUSE_CONN_SUSP, GSM_CAUSE_PROTO_ERR_UNSPEC },
|
|
{ GTPCAUSE_AUTH_FAIL, GSM_CAUSE_AUTH_FAILED },
|
|
{ GTPCAUSE_USER_AUTH_FAIL, GSM_CAUSE_ACT_REJ_GGSN },
|
|
{ GTPCAUSE_CONTEXT_NOT_FOUND, GSM_CAUSE_PROTO_ERR_UNSPEC },
|
|
{ GTPCAUSE_ADDR_OCCUPIED, GSM_CAUSE_INSUFF_RSRC },
|
|
{ GTPCAUSE_NO_MEMORY, GSM_CAUSE_INSUFF_RSRC },
|
|
{ GTPCAUSE_RELOC_FAIL, GSM_CAUSE_PROTO_ERR_UNSPEC },
|
|
{ GTPCAUSE_UNKNOWN_MAN_EXTHEADER, GSM_CAUSE_PROTO_ERR_UNSPEC },
|
|
{ GTPCAUSE_MISSING_APN, GSM_CAUSE_MISSING_APN },
|
|
{ GTPCAUSE_UNKNOWN_PDP, GSM_CAUSE_UNKNOWN_PDP },
|
|
{ 0, 0 }
|
|
};
|
|
|
|
/* The GGSN has confirmed the creation of a PDP Context */
|
|
static int create_pdp_conf(struct pdp_t *pdp, void *cbp, int cause)
|
|
{
|
|
struct sgsn_pdp_ctx *pctx = cbp;
|
|
uint8_t reject_cause;
|
|
|
|
LOGPDPCTXP(LOGL_INFO, pctx, "Received CREATE PDP CTX CONF, cause=%d(%s)\n",
|
|
cause, get_value_string(gtp_cause_strs, cause));
|
|
|
|
if (!pctx->mm) {
|
|
LOGP(DGPRS, LOGL_INFO,
|
|
"No MM context, aborting CREATE PDP CTX CONF\n");
|
|
return -EIO;
|
|
}
|
|
|
|
/* Check for cause value if it was really successful */
|
|
if (cause < 0) {
|
|
LOGP(DGPRS, LOGL_NOTICE, "Create PDP ctx req timed out\n");
|
|
if (pdp && pdp->version == 1) {
|
|
pdp->version = 0;
|
|
gtp_create_context_req(sgsn->gsn, pdp, cbp);
|
|
return 0;
|
|
} else {
|
|
reject_cause = GSM_CAUSE_NET_FAIL;
|
|
goto reject;
|
|
}
|
|
}
|
|
|
|
/* Check for cause value if it was really successful */
|
|
if (cause != GTPCAUSE_ACC_REQ) {
|
|
reject_cause = cause_map(gtp2sm_cause_map, cause,
|
|
GSM_CAUSE_ACT_REJ_GGSN);
|
|
goto reject;
|
|
}
|
|
|
|
/* Activate the SNDCP layer */
|
|
sndcp_sm_activate_ind(&pctx->mm->llme->lle[pctx->sapi], pctx->nsapi);
|
|
|
|
/* Send PDP CTX ACT to MS */
|
|
return gsm48_tx_gsm_act_pdp_acc(pctx);
|
|
|
|
reject:
|
|
/*
|
|
* In case of a timeout pdp will be NULL but we have a valid pointer
|
|
* in pctx->lib. For other rejects pctx->lib and pdp might be the
|
|
* same.
|
|
*/
|
|
pctx->state = PDP_STATE_NONE;
|
|
if (pctx->lib && pctx->lib != pdp)
|
|
pdp_freepdp(pctx->lib);
|
|
pctx->lib = NULL;
|
|
|
|
if (pdp)
|
|
pdp_freepdp(pdp);
|
|
/* Send PDP CTX ACT REJ to MS */
|
|
gsm48_tx_gsm_act_pdp_rej(pctx->mm, pctx->ti, reject_cause,
|
|
0, NULL);
|
|
sgsn_pdp_ctx_free(pctx);
|
|
|
|
return EOF;
|
|
}
|
|
|
|
/* Confirmation of a PDP Context Delete */
|
|
static int delete_pdp_conf(struct pdp_t *pdp, void *cbp, int cause)
|
|
{
|
|
struct sgsn_pdp_ctx *pctx = cbp;
|
|
int rc = 0;
|
|
|
|
LOGPDPCTXP(LOGL_INFO, pctx, "Received DELETE PDP CTX CONF, cause=%d(%s)\n",
|
|
cause, get_value_string(gtp_cause_strs, cause));
|
|
|
|
if (pctx->mm) {
|
|
/* Deactivate the SNDCP layer */
|
|
sndcp_sm_deactivate_ind(&pctx->mm->llme->lle[pctx->sapi], pctx->nsapi);
|
|
|
|
/* Confirm deactivation of PDP context to MS */
|
|
rc = gsm48_tx_gsm_deact_pdp_acc(pctx);
|
|
} else {
|
|
LOGPDPCTXP(LOGL_NOTICE, pctx,
|
|
"Not deactivating SNDCP layer since the MM context "
|
|
"is not available\n");
|
|
}
|
|
|
|
/* unlink the now non-existing library handle from the pdp
|
|
* context */
|
|
pctx->lib = NULL;
|
|
|
|
sgsn_pdp_ctx_free(pctx);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* Confirmation of an GTP ECHO request */
|
|
static int echo_conf(struct pdp_t *pdp, void *cbp, int recovery)
|
|
{
|
|
if (recovery < 0) {
|
|
LOGP(DGPRS, LOGL_NOTICE, "GTP Echo Request timed out\n");
|
|
/* FIXME: if version == 1, retry with version 0 */
|
|
} else {
|
|
DEBUGP(DGPRS, "GTP Rx Echo Response\n");
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Any message received by GGSN contains a recovery IE */
|
|
static int cb_recovery(struct sockaddr_in *peer, uint8_t recovery)
|
|
{
|
|
struct sgsn_ggsn_ctx *ggsn;
|
|
|
|
ggsn = sgsn_ggsn_ctx_by_addr(&peer->sin_addr);
|
|
if (!ggsn) {
|
|
LOGP(DGPRS, LOGL_NOTICE, "Received Recovery IE for unknown GGSN\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (ggsn->remote_restart_ctr == -1) {
|
|
/* First received ECHO RESPONSE, note the restart ctr */
|
|
ggsn->remote_restart_ctr = recovery;
|
|
} else if (ggsn->remote_restart_ctr != recovery) {
|
|
/* counter has changed (GGSN restart): release all PDP */
|
|
LOGP(DGPRS, LOGL_NOTICE, "GGSN recovery (%u->%u), "
|
|
"releasing all PDP contexts\n",
|
|
ggsn->remote_restart_ctr, recovery);
|
|
ggsn->remote_restart_ctr = recovery;
|
|
drop_all_pdp_for_ggsn(ggsn);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* libgtp callback for confirmations */
|
|
static int cb_conf(int type, int cause, struct pdp_t *pdp, void *cbp)
|
|
{
|
|
DEBUGP(DGPRS, "libgtp cb_conf(type=%d, cause=%d, pdp=%p, cbp=%p)\n",
|
|
type, cause, pdp, cbp);
|
|
|
|
if (cause == EOF)
|
|
LOGP(DGPRS, LOGL_ERROR, "libgtp EOF (type=%u, pdp=%p, cbp=%p)\n",
|
|
type, pdp, cbp);
|
|
|
|
switch (type) {
|
|
case GTP_ECHO_REQ:
|
|
/* libgtp hands us the RECOVERY number instead of a cause */
|
|
return echo_conf(pdp, cbp, cause);
|
|
case GTP_CREATE_PDP_REQ:
|
|
return create_pdp_conf(pdp, cbp, cause);
|
|
case GTP_DELETE_PDP_REQ:
|
|
return delete_pdp_conf(pdp, cbp, cause);
|
|
default:
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Called whenever a PDP context is deleted for any reason */
|
|
static int cb_delete_context(struct pdp_t *pdp)
|
|
{
|
|
LOGP(DGPRS, LOGL_INFO, "PDP Context was deleted\n");
|
|
return 0;
|
|
}
|
|
|
|
/* Called when we receive a Version Not Supported message */
|
|
static int cb_unsup_ind(struct sockaddr_in *peer)
|
|
{
|
|
LOGP(DGPRS, LOGL_INFO, "GTP Version not supported Indication "
|
|
"from %s:%u\n", inet_ntoa(peer->sin_addr),
|
|
ntohs(peer->sin_port));
|
|
return 0;
|
|
}
|
|
|
|
/* Called when we receive a Supported Ext Headers Notification */
|
|
static int cb_extheader_ind(struct sockaddr_in *peer)
|
|
{
|
|
LOGP(DGPRS, LOGL_INFO, "GTP Supported Ext Headers Noficiation "
|
|
"from %s:%u\n", inet_ntoa(peer->sin_addr),
|
|
ntohs(peer->sin_port));
|
|
return 0;
|
|
}
|
|
|
|
/* Called whenever we recive a DATA packet */
|
|
static int cb_data_ind(struct pdp_t *lib, void *packet, unsigned int len)
|
|
{
|
|
struct bssgp_paging_info pinfo;
|
|
struct sgsn_pdp_ctx *pdp;
|
|
struct sgsn_mm_ctx *mm;
|
|
struct msgb *msg;
|
|
uint8_t *ud;
|
|
|
|
DEBUGP(DGPRS, "GTP DATA IND from GGSN, length=%u\n", len);
|
|
|
|
pdp = lib->priv;
|
|
if (!pdp) {
|
|
LOGP(DGPRS, LOGL_NOTICE,
|
|
"GTP DATA IND from GGSN for unknown PDP\n");
|
|
return -EIO;
|
|
}
|
|
mm = pdp->mm;
|
|
if (!mm) {
|
|
LOGP(DGPRS, LOGL_ERROR,
|
|
"PDP context (imsi=%s) without MM context!\n", mm->imsi);
|
|
return -EIO;
|
|
}
|
|
|
|
msg = msgb_alloc_headroom(len+256, 128, "GTP->SNDCP");
|
|
ud = msgb_put(msg, len);
|
|
memcpy(ud, packet, len);
|
|
|
|
msgb_tlli(msg) = mm->tlli;
|
|
msgb_bvci(msg) = mm->bvci;
|
|
msgb_nsei(msg) = mm->nsei;
|
|
|
|
switch (mm->mm_state) {
|
|
case GMM_REGISTERED_SUSPENDED:
|
|
/* initiate PS PAGING procedure */
|
|
memset(&pinfo, 0, sizeof(pinfo));
|
|
pinfo.mode = BSSGP_PAGING_PS;
|
|
pinfo.scope = BSSGP_PAGING_BVCI;
|
|
pinfo.bvci = mm->bvci;
|
|
pinfo.imsi = mm->imsi;
|
|
pinfo.ptmsi = &mm->p_tmsi;
|
|
pinfo.drx_params = mm->drx_parms;
|
|
pinfo.qos[0] = 0; // FIXME
|
|
bssgp_tx_paging(mm->nsei, 0, &pinfo);
|
|
rate_ctr_inc(&mm->ctrg->ctr[GMM_CTR_PAGING_PS]);
|
|
/* FIXME: queue the packet we received from GTP */
|
|
break;
|
|
case GMM_REGISTERED_NORMAL:
|
|
break;
|
|
default:
|
|
LOGP(DGPRS, LOGL_ERROR, "GTP DATA IND for TLLI %08X in state "
|
|
"%u\n", mm->tlli, mm->mm_state);
|
|
msgb_free(msg);
|
|
return -1;
|
|
}
|
|
|
|
rate_ctr_inc(&pdp->ctrg->ctr[PDP_CTR_PKTS_UDATA_OUT]);
|
|
rate_ctr_add(&pdp->ctrg->ctr[PDP_CTR_BYTES_UDATA_OUT], len);
|
|
rate_ctr_inc(&mm->ctrg->ctr[GMM_CTR_PKTS_UDATA_OUT]);
|
|
rate_ctr_add(&mm->ctrg->ctr[GMM_CTR_BYTES_UDATA_OUT], len);
|
|
|
|
return sndcp_unitdata_req(msg, &mm->llme->lle[pdp->sapi],
|
|
pdp->nsapi, mm);
|
|
}
|
|
|
|
/* Called by SNDCP when it has received/re-assembled a N-PDU */
|
|
int sgsn_rx_sndcp_ud_ind(struct gprs_ra_id *ra_id, int32_t tlli, uint8_t nsapi,
|
|
struct msgb *msg, uint32_t npdu_len, uint8_t *npdu)
|
|
{
|
|
struct sgsn_mm_ctx *mmctx;
|
|
struct sgsn_pdp_ctx *pdp;
|
|
|
|
/* look-up the MM context for this message */
|
|
mmctx = sgsn_mm_ctx_by_tlli(tlli, ra_id);
|
|
if (!mmctx) {
|
|
LOGP(DGPRS, LOGL_ERROR,
|
|
"Cannot find MM CTX for TLLI %08x\n", tlli);
|
|
return -EIO;
|
|
}
|
|
/* look-up the PDP context for this message */
|
|
pdp = sgsn_pdp_ctx_by_nsapi(mmctx, nsapi);
|
|
if (!pdp) {
|
|
LOGP(DGPRS, LOGL_ERROR, "Cannot find PDP CTX for "
|
|
"TLLI=%08x, NSAPI=%u\n", tlli, nsapi);
|
|
return -EIO;
|
|
}
|
|
if (!pdp->lib) {
|
|
LOGP(DGPRS, LOGL_ERROR, "PDP CTX without libgtp\n");
|
|
return -EIO;
|
|
}
|
|
|
|
rate_ctr_inc(&pdp->ctrg->ctr[PDP_CTR_PKTS_UDATA_IN]);
|
|
rate_ctr_add(&pdp->ctrg->ctr[PDP_CTR_BYTES_UDATA_IN], npdu_len);
|
|
rate_ctr_inc(&mmctx->ctrg->ctr[GMM_CTR_PKTS_UDATA_IN]);
|
|
rate_ctr_add(&mmctx->ctrg->ctr[GMM_CTR_BYTES_UDATA_IN], npdu_len);
|
|
|
|
return gtp_data_req(pdp->ggsn->gsn, pdp->lib, npdu, npdu_len);
|
|
}
|
|
|
|
/* libgtp select loop integration */
|
|
static int sgsn_gtp_fd_cb(struct osmo_fd *fd, unsigned int what)
|
|
{
|
|
struct sgsn_instance *sgi = fd->data;
|
|
int rc;
|
|
|
|
if (!(what & BSC_FD_READ))
|
|
return 0;
|
|
|
|
switch (fd->priv_nr) {
|
|
case 0:
|
|
rc = gtp_decaps0(sgi->gsn);
|
|
break;
|
|
case 1:
|
|
rc = gtp_decaps1c(sgi->gsn);
|
|
break;
|
|
case 2:
|
|
rc = gtp_decaps1u(sgi->gsn);
|
|
break;
|
|
default:
|
|
rc = -EINVAL;
|
|
break;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
static void sgsn_gtp_tmr_start(struct sgsn_instance *sgi)
|
|
{
|
|
struct timeval next;
|
|
|
|
/* Retrieve next retransmission as struct timeval */
|
|
gtp_retranstimeout(sgi->gsn, &next);
|
|
|
|
/* re-schedule the timer */
|
|
osmo_timer_schedule(&sgi->gtp_timer, next.tv_sec, next.tv_usec/1000);
|
|
}
|
|
|
|
/* timer callback for libgtp retransmissions and ping */
|
|
static void sgsn_gtp_tmr_cb(void *data)
|
|
{
|
|
struct sgsn_instance *sgi = data;
|
|
|
|
/* Do all the retransmissions as needed */
|
|
gtp_retrans(sgi->gsn);
|
|
|
|
sgsn_gtp_tmr_start(sgi);
|
|
}
|
|
|
|
int sgsn_gtp_init(struct sgsn_instance *sgi)
|
|
{
|
|
int rc;
|
|
struct gsn_t *gsn;
|
|
|
|
rc = gtp_new(&sgi->gsn, sgi->cfg.gtp_statedir,
|
|
&sgi->cfg.gtp_listenaddr.sin_addr, GTP_MODE_SGSN);
|
|
if (rc) {
|
|
LOGP(DGPRS, LOGL_ERROR, "Failed to create GTP: %d\n", rc);
|
|
return rc;
|
|
}
|
|
gsn = sgi->gsn;
|
|
|
|
sgi->gtp_fd0.fd = gsn->fd0;
|
|
sgi->gtp_fd0.priv_nr = 0;
|
|
sgi->gtp_fd0.data = sgi;
|
|
sgi->gtp_fd0.when = BSC_FD_READ;
|
|
sgi->gtp_fd0.cb = sgsn_gtp_fd_cb;
|
|
rc = osmo_fd_register(&sgi->gtp_fd0);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
sgi->gtp_fd1c.fd = gsn->fd1c;
|
|
sgi->gtp_fd1c.priv_nr = 1;
|
|
sgi->gtp_fd1c.data = sgi;
|
|
sgi->gtp_fd1c.when = BSC_FD_READ;
|
|
sgi->gtp_fd1c.cb = sgsn_gtp_fd_cb;
|
|
rc = osmo_fd_register(&sgi->gtp_fd1c);
|
|
if (rc < 0) {
|
|
osmo_fd_unregister(&sgi->gtp_fd0);
|
|
return rc;
|
|
}
|
|
|
|
sgi->gtp_fd1u.fd = gsn->fd1u;
|
|
sgi->gtp_fd1u.priv_nr = 2;
|
|
sgi->gtp_fd1u.data = sgi;
|
|
sgi->gtp_fd1u.when = BSC_FD_READ;
|
|
sgi->gtp_fd1u.cb = sgsn_gtp_fd_cb;
|
|
rc = osmo_fd_register(&sgi->gtp_fd1u);
|
|
if (rc < 0) {
|
|
osmo_fd_unregister(&sgi->gtp_fd0);
|
|
osmo_fd_unregister(&sgi->gtp_fd1c);
|
|
return rc;
|
|
}
|
|
|
|
/* Start GTP re-transmission timer */
|
|
sgi->gtp_timer.cb = sgsn_gtp_tmr_cb;
|
|
sgi->gtp_timer.data = sgi;
|
|
sgsn_gtp_tmr_start(sgi);
|
|
|
|
/* Register callbackcs with libgtp */
|
|
gtp_set_cb_delete_context(gsn, cb_delete_context);
|
|
gtp_set_cb_conf(gsn, cb_conf);
|
|
gtp_set_cb_recovery(gsn, cb_recovery);
|
|
gtp_set_cb_data_ind(gsn, cb_data_ind);
|
|
gtp_set_cb_unsup_ind(gsn, cb_unsup_ind);
|
|
gtp_set_cb_extheader_ind(gsn, cb_extheader_ind);
|
|
|
|
return 0;
|
|
}
|