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76328bdc91
Add mslookup client to find remote home HLRs of unknown IMSIs, and proxy/forward GSUP for those to the right remote HLR instances. Add remote_hlr.c to manage one GSUP client per remote HLR GSUP address. Add proxy.c to keep state about remotely handled IMSIs (remote GSUP address, MSISDN, and probably more in future patches). The mslookup_server that determines whether a given MSISDN is attached locally now also needs to look in the proxy record: it is always the osmo-hlr immediately peering for the MSC that should respond to mslookup service address queries like SIP and SMPP. (Only gsup.hlr service is always answered by the home HLR.) Add dgsm.c to set up an mdns mslookup client, ask for IMSI homes, and to decide which GSUP is handled locally and which needs to go to a remote HLR. Add full VTY config and VTY tests. 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: I2fe453553c90e6ee527ed13a13089900efd488aa
96 lines
3.9 KiB
C
96 lines
3.9 KiB
C
/* Copyright 2019 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#pragma once
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#include <time.h>
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#include <osmocom/gsm/protocol/gsm_23_003.h>
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#include <osmocom/core/sockaddr_str.h>
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#include <osmocom/gsupclient/cni_peer_id.h>
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#include <osmocom/hlr/timestamp.h>
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struct osmo_gsup_req;
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struct remote_hlr;
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struct proxy {
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struct llist_head subscr_list;
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struct llist_head pending_gsup_reqs;
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/* When messages arrive back from a remote HLR that this is the proxy for, reach the VLR to forward the response
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* to via this osmo_gsup_server. */
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struct osmo_gsup_server *gsup_server_to_vlr;
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/* How long to keep proxy entries without a refresh, in seconds. */
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uint32_t fresh_time;
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/* How often to garbage collect the proxy cache, period in seconds.
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* To change this and take effect immediately, rather use proxy_set_gc_period(). */
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uint32_t gc_period;
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struct osmo_timer_list gc_timer;
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};
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struct proxy_subscr_domain_state {
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struct osmo_ipa_name vlr_name;
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timestamp_t last_lu;
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/* The name from which an Update Location Request was received. Copied to vlr_name as soon as the LU is
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* completed successfully. */
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struct osmo_ipa_name vlr_name_preliminary;
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/* Set if this is a middle proxy, i.e. a proxy behind another proxy.
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* That is mostly to know whether the MS is attached at a local MSC/SGSN or further away.
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* It could be a boolean, but store the full name for logging. Set only at successful LU acceptance. */
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struct osmo_ipa_name vlr_via_proxy;
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};
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struct proxy_subscr {
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char imsi[GSM23003_IMSI_MAX_DIGITS+1];
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char msisdn[GSM23003_MSISDN_MAX_DIGITS+1];
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struct osmo_sockaddr_str remote_hlr_addr;
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struct proxy_subscr_domain_state cs, ps;
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};
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void proxy_init(struct osmo_gsup_server *gsup_server_to_vlr);
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void proxy_del(struct proxy *proxy);
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void proxy_set_gc_period(struct proxy *proxy, uint32_t gc_period);
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/* The API to access / modify proxy entries keeps the implementation opaque, to make sure that we can easily move proxy
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* storage to SQLite db. */
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int proxy_subscr_get_by_imsi(struct proxy_subscr *dst, struct proxy *proxy, const char *imsi);
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int proxy_subscr_get_by_msisdn(struct proxy_subscr *dst, struct proxy *proxy, const char *msisdn);
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void proxy_subscrs_get_by_remote_hlr(struct proxy *proxy, const struct osmo_sockaddr_str *remote_hlr_addr,
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bool (*yield)(struct proxy *proxy, const struct proxy_subscr *subscr, void *data),
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void *data);
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int proxy_subscr_create_or_update(struct proxy *proxy, const struct proxy_subscr *proxy_subscr);
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int proxy_subscr_del(struct proxy *proxy, const char *imsi);
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int proxy_subscr_forward_to_remote_hlr(struct proxy *proxy, const struct proxy_subscr *proxy_subscr,
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struct osmo_gsup_req *req);
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void proxy_subscr_forward_to_remote_hlr_resolved(struct proxy *proxy, const struct proxy_subscr *proxy_subscr,
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struct remote_hlr *remote_hlr, struct osmo_gsup_req *req);
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int proxy_subscr_forward_to_vlr(struct proxy *proxy, const struct proxy_subscr *proxy_subscr,
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const struct osmo_gsup_message *gsup, struct remote_hlr *from_remote_hlr);
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void proxy_subscr_remote_hlr_resolved(struct proxy *proxy, const struct proxy_subscr *proxy_subscr,
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const struct osmo_sockaddr_str *remote_hlr_addr);
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void proxy_subscr_remote_hlr_up(struct proxy *proxy, const struct proxy_subscr *proxy_subscr,
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struct remote_hlr *remote_hlr);
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