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/* GPRS SGSN functionality */
/* (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 <sys/types.h>
#include <osmocore/linuxlist.h>
#include <osmocore/talloc.h>
#include <osmocore/timer.h>
#include <openbsc/gsm_subscriber.h>
#include <openbsc/debug.h>
#include <openbsc/gprs_sgsn.h>
#include <openbsc/gprs_ns.h>
#include <openbsc/gprs_bssgp.h>
static LLIST_HEAD(sgsn_mm_ctxts);
static int ra_id_equals(const struct gprs_ra_id *id1,
const struct gprs_ra_id *id2)
{
return (id1->mcc == id2->mcc && id1->mnc == id2->mnc &&
id1->lac == id2->lac && id1->rac == id2->rac);
}
/* look-up a SGSN MM context based on TLLI + RAI */
struct sgsn_mm_ctx *sgsn_mm_ctx_by_tlli(u_int32_t tlli,
const struct gprs_ra_id *raid)
{
struct sgsn_mm_ctx *ctx;
llist_for_each_entry(ctx, &sgsn_mm_ctxts, list) {
if (tlli == ctx->tlli &&
ra_id_equals(raid, &ctx->ra))
return ctx;
}
return NULL;
}
struct sgsn_mm_ctx *sgsn_mm_ctx_by_ptmsi(u_int32_t p_tmsi)
{
struct sgsn_mm_ctx *ctx;
llist_for_each_entry(ctx, &sgsn_mm_ctxts, list) {
if (p_tmsi == ctx->p_tmsi)
return ctx;
}
return NULL;
}
struct sgsn_mm_ctx *sgsn_mm_ctx_by_imsi(const char *imsi)
{
struct sgsn_mm_ctx *ctx;
llist_for_each_entry(ctx, &sgsn_mm_ctxts, list) {
if (!strcmp(imsi, ctx->imsi))
return ctx;
}
return NULL;
}
/* Allocate a new SGSN MM context */
struct sgsn_mm_ctx *sgsn_mm_ctx_alloc(u_int32_t tlli,
const struct gprs_ra_id *raid)
{
struct sgsn_mm_ctx *ctx = talloc_zero(NULL, struct sgsn_mm_ctx);
if (!ctx)
return NULL;
memcpy(&ctx->ra, raid, sizeof(ctx->ra));
ctx->tlli = tlli;
ctx->mm_state = GMM_DEREGISTERED;
llist_add(&ctx->list, &sgsn_mm_ctxts);
return ctx;
}
/* call-back function for the NS protocol */
static int gprs_ns_cb(enum gprs_ns_evt event, struct gprs_nsvc *nsvc,
struct msgb *msg, u_int16_t bvci)
{
int rc = 0;
switch (event) {
case GPRS_NS_EVT_UNIT_DATA:
/* hand the message into the BSSGP implementation */
rc = gprs_bssgp_rcvmsg(msg, bvci);
break;
default:
LOGP(DGPRS, LOGL_ERROR, "SGSN: Unknown event %u from NS\n", event);
if (msg)
talloc_free(msg);
rc = -EIO;
break;
}
return rc;
}
int sgsn_init(void)
{
struct gprs_ns_inst *nsi;
nsi = gprs_ns_instantiate(&gprs_ns_cb);
if (!nsi)
return -EIO;
return nsip_listen(nsi, 23000);
}
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