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/* Core SS7 AS Handling */
/* (C) 2015-2017 by Harald Welte <laforge@gnumonks.org>
* (C) 2023 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
* All Rights Reserved
*
* SPDX-License-Identifier: GPL-2.0+
*
* 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, see <http://www.gnu.org/licenses/>.
*
*/
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <inttypes.h>
#include <osmocom/sigtran/osmo_ss7.h>
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/utils.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/logging.h>
#include "ss7_internal.h"
#include "xua_as_fsm.h"
#include "xua_asp_fsm.h"
/***********************************************************************
* SS7 Application Server
***********************************************************************/
struct value_string osmo_ss7_as_traffic_mode_vals[] = {
{ OSMO_SS7_AS_TMOD_BCAST, "broadcast" },
{ OSMO_SS7_AS_TMOD_LOADSHARE, "loadshare" },
{ OSMO_SS7_AS_TMOD_ROUNDROBIN, "round-robin" },
{ OSMO_SS7_AS_TMOD_OVERRIDE, "override" },
{ 0, NULL }
};
static const struct rate_ctr_desc ss7_as_rcd[] = {
[SS7_AS_CTR_RX_MSU_TOTAL] = { "rx:msu:total", "Total number of MSU received" },
[SS7_AS_CTR_TX_MSU_TOTAL] = { "tx:msu:total", "Total number of MSU transmitted" },
};
static const struct rate_ctr_group_desc ss7_as_rcgd = {
.group_name_prefix = "sigtran_as",
.group_description = "SIGTRAN Application Server",
.num_ctr = ARRAY_SIZE(ss7_as_rcd),
.ctr_desc = ss7_as_rcd,
};
static unsigned int g_ss7_as_rcg_idx;
/*! \brief Allocate an Application Server
* \param[in] inst SS7 Instance on which we operate
* \param[in] name Name of Application Server
* \param[in] proto Protocol of Application Server
* \returns pointer to Application Server on success; NULL otherwise */
struct osmo_ss7_as *ss7_as_alloc(struct osmo_ss7_instance *inst, const char *name,
enum osmo_ss7_asp_protocol proto)
{
struct osmo_ss7_as *as;
as = talloc_zero(inst, struct osmo_ss7_as);
if (!as)
return NULL;
as->ctrg = rate_ctr_group_alloc(as, &ss7_as_rcgd, g_ss7_as_rcg_idx++);
if (!as->ctrg) {
talloc_free(as);
return NULL;
}
rate_ctr_group_set_name(as->ctrg, name);
as->inst = inst;
as->cfg.name = talloc_strdup(as, name);
as->cfg.proto = proto;
as->cfg.mode = OSMO_SS7_AS_TMOD_OVERRIDE;
as->cfg.recovery_timeout_msec = 2000;
as->cfg.routing_key.l_rk_id = ss7_find_free_l_rk_id(inst);
as->fi = xua_as_fsm_start(as, LOGL_DEBUG);
llist_add_tail(&as->list, &inst->as_list);
return as;
}
/*! \brief Add given ASP to given AS
* \param[in] as Application Server to which \ref asp is added
* \param[in] asp Application Server Process to be added to \ref as
* \returns 0 on success; negative in case of error */
int osmo_ss7_as_add_asp(struct osmo_ss7_as *as, const char *asp_name)
{
struct osmo_ss7_asp *asp;
unsigned int i;
OSMO_ASSERT(ss7_initialized);
asp = osmo_ss7_asp_find_by_name(as->inst, asp_name);
if (!asp)
return -ENODEV;
LOGPAS(as, DLSS7, LOGL_INFO, "Adding ASP %s to AS\n", asp->cfg.name);
if (osmo_ss7_as_has_asp(as, asp))
return 0;
for (i = 0; i < ARRAY_SIZE(as->cfg.asps); i++) {
if (!as->cfg.asps[i]) {
as->cfg.asps[i] = asp;
if (asp->fi)
osmo_fsm_inst_dispatch(asp->fi, XUA_ASP_E_AS_ASSIGNED, as);
return 0;
}
}
return -ENOSPC;
}
/*! \brief Delete given ASP from given AS
* \param[in] as Application Server from which \ref asp is deleted
* \param[in] asp Application Server Process to delete from \ref as
* \returns 0 on success; negative in case of error */
int osmo_ss7_as_del_asp(struct osmo_ss7_as *as, const char *asp_name)
{
struct osmo_ss7_asp *asp;
unsigned int i;
OSMO_ASSERT(ss7_initialized);
asp = osmo_ss7_asp_find_by_name(as->inst, asp_name);
if (!asp)
return -ENODEV;
LOGPAS(as, DLSS7, LOGL_INFO, "Removing ASP %s from AS\n", asp->cfg.name);
for (i = 0; i < ARRAY_SIZE(as->cfg.asps); i++) {
if (as->cfg.asps[i] == asp) {
as->cfg.asps[i] = NULL;
return 0;
}
}
return -EINVAL;
}
/*! \brief Destroy given Application Server
* \param[in] as Application Server to destroy */
void osmo_ss7_as_destroy(struct osmo_ss7_as *as)
{
struct osmo_ss7_route *rt, *rt2;
OSMO_ASSERT(ss7_initialized);
LOGPAS(as, DLSS7, LOGL_INFO, "Destroying AS\n");
if (as->fi)
osmo_fsm_inst_term(as->fi, OSMO_FSM_TERM_REQUEST, NULL);
/* find any routes pointing to this AS and remove them */
llist_for_each_entry_safe(rt, rt2, &as->inst->rtable_system->routes, list) {
if (rt->dest.as == as)
osmo_ss7_route_destroy(rt);
}
as->inst = NULL;
llist_del(&as->list);
rate_ctr_group_free(as->ctrg);
talloc_free(as);
}
/*! \brief Determine if given AS contains ASP
* \param[in] as Application Server in which to look for \ref asp
* \param[in] asp Application Server Process to look for in \ref as
* \returns true in case \ref asp is part of \ref as; false otherwise */
bool osmo_ss7_as_has_asp(const struct osmo_ss7_as *as,
const struct osmo_ss7_asp *asp)
{
unsigned int i;
OSMO_ASSERT(ss7_initialized);
for (i = 0; i < ARRAY_SIZE(as->cfg.asps); i++) {
if (as->cfg.asps[i] == asp)
return true;
}
return false;
}
/*! Determine if given AS is in the active state.
* \param[in] as Application Server.
* \returns true in case as is active; false otherwise. */
bool osmo_ss7_as_active(const struct osmo_ss7_as *as)
{
if (!as->fi)
return false;
return as->fi->state == XUA_AS_S_ACTIVE;
}
/*! Determine if given AS is in the down state.
* \param[in] as Application Server.
* \returns true in case as is down; false otherwise. */
bool osmo_ss7_as_down(const struct osmo_ss7_as *as)
{
OSMO_ASSERT(as);
if (!as->fi)
return true;
return as->fi->state == XUA_AS_S_DOWN;
}
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