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/* Manage identity of neighboring BSS cells for inter-MSC handover. */
/* (C) 2018 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
*
* All Rights Reserved
*
* Author: Neels Hofmeyr <nhofmeyr@sysmocom.de>
* Author: Stefan Sperling <ssperling@sysmocom.de>
*
* 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 <errno.h>
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/utils.h>
#include <osmocom/gsm/gsm0808.h>
#include <osmocom/sigtran/osmo_ss7.h>
#include <osmocom/msc/neighbor_ident.h>
#include <osmocom/msc/gsm_data.h>
/* XXX greater than or equal to IPA_STIRNG_MAX (libosmocore) and MAX_PC_STR_LEN (libosmo-sccp). */
#define NEIGHBOR_IDENT_ADDR_STRING_MAX 64
const char *neighbor_ident_addr_name(struct gsm_network *net, const struct neighbor_ident_addr *na)
{
static char buf[NEIGHBOR_IDENT_ADDR_STRING_MAX + 4];
struct osmo_ss7_instance *ss7;
switch (na->type) {
case MSC_NEIGHBOR_TYPE_BSC:
ss7 = osmo_ss7_instance_find(net->a.cs7_instance);
OSMO_ASSERT(ss7);
snprintf(buf, sizeof(buf), "BSC %s", osmo_ss7_pointcode_print(ss7, na->a.point_code));
break;
case MSC_NEIGHBOR_TYPE_MSC:
snprintf(buf, sizeof(buf), "MSC %s", na->a.ipa_name);
break;
default:
return NULL;
}
return buf;
}
struct neighbor_ident_list *neighbor_ident_init(void *talloc_ctx)
{
struct neighbor_ident_list *nil = talloc_zero(talloc_ctx, struct neighbor_ident_list);
OSMO_ASSERT(nil);
INIT_LLIST_HEAD(&nil->list);
return nil;
}
void neighbor_ident_free(struct neighbor_ident_list *nil)
{
if (!nil)
return;
talloc_free(nil);
}
static struct neighbor_ident *_neighbor_ident_get(const struct neighbor_ident_list *nil,
const struct neighbor_ident_addr *na)
{
struct neighbor_ident *ni;
llist_for_each_entry(ni, &nil->list, entry) {
if (na->type != ni->addr.type)
continue;
switch (na->type) {
case MSC_NEIGHBOR_TYPE_BSC:
if (ni->addr.a.point_code == na->a.point_code)
return ni;
break;
case MSC_NEIGHBOR_TYPE_MSC:
if (strcmp(ni->addr.a.ipa_name, na->a.ipa_name) == 0)
return ni;
break;
}
}
return NULL;
}
static void _neighbor_ident_free(struct neighbor_ident *ni)
{
llist_del(&ni->entry);
talloc_free(ni);
}
/*! Add Cell Identifiers to a neighbor BSC/MSC entry.
* Exactly one kind of identifier is allowed per entry, and any number of entries of that kind
* may be added up to the capacity of gsm0808_cell_id_list2, by one or more calls to this function. To
* replace an existing entry, first call neighbor_ident_del(nil, cell_id).
* \returns number of entries in the resulting identifier list, or negative on error:
* see gsm0808_cell_id_list_add() for the meaning of returned error codes;
* return -ENOMEM when the list is not initialized, -ERANGE when the BSIC value is too large. */
int neighbor_ident_add(struct neighbor_ident_list *nil, const struct neighbor_ident_addr *addr,
const struct gsm0808_cell_id_list2 *cell_id)
{
struct neighbor_ident *ni;
int rc;
if (!nil)
return -ENOMEM;
ni = _neighbor_ident_get(nil, addr);
if (!ni) {
ni = talloc_zero(nil, struct neighbor_ident);
OSMO_ASSERT(ni);
ni->addr = *addr;
llist_add_tail(&ni->entry, &nil->list);
return ni->cell_ids.id_list_len;
}
rc = gsm0808_cell_id_list_add(&ni->cell_ids, cell_id);
if (rc < 0)
return rc;
return ni->cell_ids.id_list_len;
}
/*! Find cell identity for given BSC or MSC, as previously added by neighbor_ident_add().
*/
const struct gsm0808_cell_id_list2 *neighbor_ident_get(const struct neighbor_ident_list *nil,
const struct neighbor_ident_addr *addr)
{
struct neighbor_ident *ni;
if (!nil)
return NULL;
ni = _neighbor_ident_get(nil, addr);
if (!ni)
return NULL;
return &ni->cell_ids;
}
/*! Find a BSC or MSC, as previously added by neighbor_ident_add(), for a given cell identity.
*/
const struct neighbor_ident_addr *neighbor_ident_lookup_cell(const struct neighbor_ident_list *nil,
struct gsm0808_cell_id *cell_id)
{
struct neighbor_ident *ni;
if (!nil)
return NULL;
llist_for_each_entry(ni, &nil->list, entry) {
if (gsm0808_cell_id_matches_list(cell_id, &ni->cell_ids, 0))
return &ni->addr;
}
return NULL;
}
bool neighbor_ident_del(struct neighbor_ident_list *nil, const struct neighbor_ident_addr *addr)
{
struct neighbor_ident *ni;
if (!nil)
return false;
ni = _neighbor_ident_get(nil, addr);
if (!ni)
return false;
_neighbor_ident_free(ni);
return true;
}
void neighbor_ident_clear(struct neighbor_ident_list *nil)
{
struct neighbor_ident *ni;
while ((ni = llist_first_entry_or_null(&nil->list, struct neighbor_ident, entry)))
_neighbor_ident_free(ni);
}
/*! Iterate all neighbor_ident_list entries and call iter_cb for each.
* If iter_cb returns false, the iteration is stopped. */
void neighbor_ident_iter(const struct neighbor_ident_list *nil,
bool (* iter_cb )(const struct neighbor_ident_addr *addr,
const struct gsm0808_cell_id_list2 *cell_ids,
void *cb_data),
void *cb_data)
{
struct neighbor_ident *ni, *ni_next;
if (!nil)
return;
llist_for_each_entry_safe(ni, ni_next, &nil->list, entry) {
if (!iter_cb(&ni->addr, &ni->cell_ids, cb_data))
return;
}
}
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