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/* PDP context 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 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 <stdint.h>
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/timer.h>
#include <osmocom/core/rate_ctr.h>
#include <osmocom/core/stats.h>
#include <osmocom/sgsn/pdpctx.h>
#include <osmocom/sgsn/mmctx.h>
#include <osmocom/sgsn/sgsn.h>
#include <osmocom/sgsn/debug.h>
#include <osmocom/sgsn/signal.h>
#include <osmocom/sgsn/gtp_ggsn.h>
#include <osmocom/sgsn/gprs_llc_xid.h>
#include <osmocom/sgsn/gprs_sndcp.h>
#include <osmocom/sgsn/gprs_llc.h>
#include <osmocom/sgsn/gprs_sm.h>
#include <osmocom/sgsn/gtp.h>
static const struct rate_ctr_desc pdpctx_ctr_description[] = {
{ "udata:packets:in", "User Data Messages ( In)" },
{ "udata:packets:out", "User Data Messages (Out)" },
{ "udata:bytes:in", "User Data Bytes ( In)" },
{ "udata:bytes:out", "User Data Bytes (Out)" },
};
static const struct rate_ctr_group_desc pdpctx_ctrg_desc = {
.group_name_prefix = "sgsn:pdpctx",
.group_description = "SGSN PDP Context Statistics",
.num_ctr = ARRAY_SIZE(pdpctx_ctr_description),
.ctr_desc = pdpctx_ctr_description,
.class_id = OSMO_STATS_CLASS_SUBSCRIBER,
};
/* you don't want to use this directly, call sgsn_create_pdp_ctx() */
struct sgsn_pdp_ctx *sgsn_pdp_ctx_alloc(struct sgsn_mm_ctx *mm,
struct sgsn_ggsn_ctx *ggsn,
uint8_t nsapi)
{
struct sgsn_pdp_ctx *pdp;
pdp = sgsn_pdp_ctx_by_nsapi(mm, nsapi);
if (pdp)
return NULL;
pdp = talloc_zero(sgsn, struct sgsn_pdp_ctx);
if (!pdp)
return NULL;
pdp->mm = mm;
pdp->ggsn = ggsn;
pdp->nsapi = nsapi;
pdp->ctrg = rate_ctr_group_alloc(pdp, &pdpctx_ctrg_desc, nsapi);
if (!pdp->ctrg) {
LOGPDPCTXP(LOGL_ERROR, pdp, "Error allocation counter group\n");
talloc_free(pdp);
return NULL;
}
llist_add(&pdp->list, &mm->pdp_list);
sgsn_ggsn_ctx_add_pdp(pdp->ggsn, pdp);
llist_add(&pdp->g_list, &sgsn->pdp_list);
return pdp;
}
/*
* This function will not trigger any GSM DEACT PDP ACK messages, so you
* probably want to call sgsn_delete_pdp_ctx() instead if the connection
* isn't detached already.
*/
void sgsn_pdp_ctx_terminate(struct sgsn_pdp_ctx *pdp)
{
struct sgsn_signal_data sig_data;
OSMO_ASSERT(pdp->mm != NULL);
/* There might still be pending callbacks in libgtp. So the parts of
* this object relevant to GTP need to remain intact in this case. */
LOGPDPCTXP(LOGL_INFO, pdp, "Forcing release of PDP context\n");
if (pdp->mm->ran_type == MM_CTX_T_GERAN_Gb) {
/* Force the deactivation of the SNDCP layer */
if (pdp->mm->gb.llme)
sndcp_sm_deactivate_ind(&pdp->mm->gb.llme->lle[pdp->sapi], pdp->nsapi);
}
memset(&sig_data, 0, sizeof(sig_data));
sig_data.pdp = pdp;
osmo_signal_dispatch(SS_SGSN, S_SGSN_PDP_TERMINATE, &sig_data);
/* Detach from MM context */
pdp_ctx_detach_mm_ctx(pdp);
if (pdp->ggsn)
sgsn_delete_pdp_ctx(pdp);
}
/*
* Don't call this function directly unless you know what you are doing.
* In normal conditions use sgsn_delete_pdp_ctx and in unspecified or
* implementation dependent abnormal ones sgsn_pdp_ctx_terminate.
*/
void sgsn_pdp_ctx_free(struct sgsn_pdp_ctx *pdp)
{
struct sgsn_signal_data sig_data;
memset(&sig_data, 0, sizeof(sig_data));
sig_data.pdp = pdp;
osmo_signal_dispatch(SS_SGSN, S_SGSN_PDP_FREE, &sig_data);
if (osmo_timer_pending(&pdp->timer)) {
LOGPDPCTXP(LOGL_ERROR, pdp, "Freeing PDP ctx with timer %u pending\n", pdp->T);
osmo_timer_del(&pdp->timer);
}
rate_ctr_group_free(pdp->ctrg);
if (pdp->mm)
llist_del(&pdp->list);
if (pdp->ggsn)
sgsn_ggsn_ctx_remove_pdp(pdp->ggsn, pdp);
llist_del(&pdp->g_list);
/* _if_ we still have a library handle, at least set it to NULL
* to avoid any dereferences of the now-deleted PDP context from
* sgsn_libgtp:cb_data_ind() */
if (pdp->lib) {
struct pdp_t *lib = pdp->lib;
LOGPDPCTXP(LOGL_NOTICE, pdp, "freeing PDP context that still "
"has a libgtp handle attached to it, this shouldn't "
"happen!\n");
osmo_generate_backtrace();
lib->priv = NULL;
}
talloc_free(pdp);
}
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