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D-GSM 1/n: add mslookup server in osmo-hlr

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Implement the mslookup server to service remote mslookup requests.

This patch merely adds the logic to answer incoming mslookup requests, an
actual method to receive requests (mDNS) follows in a subsequent patch.

- API to configure service names and addresses for the local site (per MSC).
- determine whether a subscriber is on a local MSC
  (checking the local proxy will be added in subsequent patch that adds proxy
  capability).
- VTY config follows in a subsequent patch.

For a detailed overview of the D-GSM and mslookup related files, please see the
elaborate comment at the top of mslookup.c (already added in an earlier patch).

Change-Id: Ife4a61d71926d08f310a1aeed9d9f1974f64178b
This commit is contained in:
Neels Hofmeyr
2019-11-20 03:35:37 +01:00
parent 86b507b6ea
commit ab7dc40f16
8 changed files with 537 additions and 0 deletions
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2
include/osmocom/hlr/Makefile.am
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@@ -10,5 +10,7 @@ noinst_HEADERS = \
hlr_vty_subscr.h \
logging.h \
lu_fsm.h \
mslookup_server.h \
rand.h \
timestamp.h \
$(NULL)

7
include/osmocom/hlr/hlr.h
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@@ -67,6 +67,13 @@ struct hlr {
/* Bitmask of DB_SUBSCR_FLAG_* */
uint8_t subscr_create_on_demand_flags;
unsigned int subscr_create_on_demand_rand_msisdn_len;
struct {
struct {
uint32_t local_attach_max_age;
struct llist_head local_site_services;
} server;
} mslookup;
};
extern struct hlr *g_hlr;

65
include/osmocom/hlr/mslookup_server.h Normal file
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@@ -0,0 +1,65 @@
/* Copyright 2019 by sysmocom s.f.m.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/>.
*
*/
#pragma once
struct osmo_mslookup_query;
struct osmo_mslookup_result;
/*! mslookup service name used for roaming/proxying between osmo-hlr instances. */
#define OSMO_MSLOOKUP_SERVICE_HLR_GSUP "gsup.hlr"
/*! What addresses to return to mslookup queries when a subscriber is attached at the local site.
* Mapping of service name to IP address and port. This corresponds to the VTY config for
* 'mslookup' / 'server' [/ 'msc MSC-1-2-3'] / 'service sip.voice at 1.2.3.4 1234'.
*/
struct mslookup_service_host {
struct llist_head entry;
char service[OSMO_MSLOOKUP_SERVICE_MAXLEN+1];
struct osmo_sockaddr_str host_v4;
struct osmo_sockaddr_str host_v6;
};
/*! Sets of mslookup_service_host per connected MSC.
* When there are more than one MSC connected to this osmo-hlr, this allows keeping separate sets of service addresses
* for each MSC. The entry with mslookup_server_msc_wildcard as MSC name is used for all MSCs (if no match for that
* particular MSC is found). This corresponds to the VTY config for
* 'mslookup' / 'server' / 'msc MSC-1-2-3'.
*/
struct mslookup_server_msc_cfg {
struct llist_head entry;
struct osmo_ipa_name name;
struct llist_head service_hosts;
};
struct mslookup_service_host *mslookup_server_service_get(const struct osmo_ipa_name *msc_name, const char *service);
struct mslookup_service_host *mslookup_server_msc_service_get(struct mslookup_server_msc_cfg *msc, const char *service,
bool create);
int mslookup_server_msc_service_set(struct mslookup_server_msc_cfg *msc, const char *service,
const struct osmo_sockaddr_str *addr);
int mslookup_server_msc_service_del(struct mslookup_server_msc_cfg *msc, const char *service,
const struct osmo_sockaddr_str *addr);
extern const struct osmo_ipa_name mslookup_server_msc_wildcard;
struct mslookup_server_msc_cfg *mslookup_server_msc_get(const struct osmo_ipa_name *msc_name, bool create);
const struct mslookup_service_host *mslookup_server_get_local_gsup_addr();
void mslookup_server_rx(const struct osmo_mslookup_query *query,
struct osmo_mslookup_result *result);

28
include/osmocom/hlr/timestamp.h Normal file
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@@ -0,0 +1,28 @@
/* Copyright 2019 by sysmocom s.f.m.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/>.
*
*/
#pragma once
#include <sys/time.h>
#include <stdbool.h>
#include <stdint.h>
typedef time_t timestamp_t;
void timestamp_update(timestamp_t *timestamp);
bool timestamp_age(const timestamp_t *timestamp, uint32_t *age);