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/* GGSN context (peer) */
/* (C) 2009 by Harald Welte <laforge@gnumonks.org>
* (C) 2023 by sysmocom - s.m.f.c. GmbH <info@sysmocom.de>
*
* 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/gtp_ggsn.h>
#include <osmocom/sgsn/sgsn.h>
#include <osmocom/sgsn/debug.h>
#include <osmocom/sgsn/gprs_gmm_fsm.h>
#include <osmocom/sgsn/gprs_sm.h>
extern void *tall_sgsn_ctx;
void sgsn_ggsn_ctx_check_echo_timer(struct sgsn_ggsn_ctx *ggc)
{
bool pending = osmo_timer_pending(&ggc->echo_timer);
/* Only enable if allowed by policy and at least 1 pdp ctx exists against ggsn */
if (!llist_empty(&ggc->pdp_list) && ggc->echo_interval) {
if (!pending)
osmo_timer_schedule(&ggc->echo_timer, ggc->echo_interval, 0);
} else {
if (pending)
osmo_timer_del(&ggc->echo_timer);
}
}
/* GGSN contexts */
static void echo_timer_cb(void *data)
{
struct sgsn_ggsn_ctx *ggc = (struct sgsn_ggsn_ctx *) data;
sgsn_ggsn_echo_req(ggc);
osmo_timer_schedule(&ggc->echo_timer, ggc->echo_interval, 0);
}
struct sgsn_ggsn_ctx *sgsn_ggsn_ctx_alloc(uint32_t id)
{
struct sgsn_ggsn_ctx *ggc;
ggc = talloc_zero(tall_sgsn_ctx, struct sgsn_ggsn_ctx);
if (!ggc)
return NULL;
ggc->id = id;
ggc->gtp_version = 1;
ggc->remote_restart_ctr = -1;
/* if we are called from config file parse, this gsn doesn't exist yet */
ggc->gsn = sgsn->gsn;
INIT_LLIST_HEAD(&ggc->pdp_list);
osmo_timer_setup(&ggc->echo_timer, echo_timer_cb, ggc);
llist_add(&ggc->list, &sgsn->ggsn_list);
return ggc;
}
void sgsn_ggsn_ctx_free(struct sgsn_ggsn_ctx *ggc)
{
OSMO_ASSERT(llist_empty(&ggc->pdp_list));
llist_del(&ggc->list);
talloc_free(ggc);
}
struct sgsn_ggsn_ctx *sgsn_ggsn_ctx_by_id(uint32_t id)
{
struct sgsn_ggsn_ctx *ggc;
llist_for_each_entry(ggc, &sgsn->ggsn_list, list) {
if (id == ggc->id)
return ggc;
}
return NULL;
}
struct sgsn_ggsn_ctx *sgsn_ggsn_ctx_by_addr(struct in_addr *addr)
{
struct sgsn_ggsn_ctx *ggc;
llist_for_each_entry(ggc, &sgsn->ggsn_list, list) {
if (!memcmp(addr, &ggc->remote_addr, sizeof(*addr)))
return ggc;
}
return NULL;
}
struct sgsn_ggsn_ctx *sgsn_ggsn_ctx_find_alloc(uint32_t id)
{
struct sgsn_ggsn_ctx *ggc;
ggc = sgsn_ggsn_ctx_by_id(id);
if (!ggc)
ggc = sgsn_ggsn_ctx_alloc(id);
return ggc;
}
void sgsn_ggsn_ctx_drop_pdp(struct sgsn_pdp_ctx *pctx)
{
/* the MM context can be deleted while the GGSN is not reachable or
* if has been crashed. */
if (pctx->mm && pctx->mm->gmm_fsm->state == ST_GMM_REGISTERED_NORMAL) {
gsm48_tx_gsm_deact_pdp_req(pctx, GSM_CAUSE_NET_FAIL, true);
sgsn_ggsn_ctx_remove_pdp(pctx->ggsn, pctx);
} else {
/* FIXME: GPRS paging in case MS is SUSPENDED */
LOGPDPCTXP(LOGL_NOTICE, pctx, "Hard-dropping PDP ctx due to GGSN "
"recovery\n");
/* FIXME: how to tell this to libgtp? */
sgsn_pdp_ctx_free(pctx);
}
}
/* High-level function to be called in case a GGSN has disappeared or
* otherwise lost state (recovery procedure). It will detach all related pdp ctx
* from a ggsn and communicate deact to MS. Optionally (!NULL), one pdp ctx can
* be kept alive to allow handling later message which contained the Recovery IE. */
int sgsn_ggsn_ctx_drop_all_pdp_except(struct sgsn_ggsn_ctx *ggsn, struct sgsn_pdp_ctx *except)
{
int num = 0;
struct sgsn_pdp_ctx *pdp, *pdp2;
llist_for_each_entry_safe(pdp, pdp2, &ggsn->pdp_list, ggsn_list) {
if (pdp == except)
continue;
sgsn_ggsn_ctx_drop_pdp(pdp);
num++;
}
return num;
}
int sgsn_ggsn_ctx_drop_all_pdp(struct sgsn_ggsn_ctx *ggsn)
{
return sgsn_ggsn_ctx_drop_all_pdp_except(ggsn, NULL);
}
void sgsn_ggsn_ctx_add_pdp(struct sgsn_ggsn_ctx *ggc, struct sgsn_pdp_ctx *pdp)
{
llist_add(&pdp->ggsn_list, &ggc->pdp_list);
sgsn_ggsn_ctx_check_echo_timer(ggc);
}
void sgsn_ggsn_ctx_remove_pdp(struct sgsn_ggsn_ctx *ggc, struct sgsn_pdp_ctx *pdp)
{
llist_del(&pdp->ggsn_list);
sgsn_ggsn_ctx_check_echo_timer(ggc);
if (pdp->destroy_ggsn)
sgsn_ggsn_ctx_free(pdp->ggsn);
pdp->ggsn = NULL;
/* Drop references to libgtp since the conn is down */
if (pdp->lib)
pdp_freepdp(pdp->lib);
pdp->lib = NULL;
}
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