460 lines
15 KiB
C
460 lines
15 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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#include <string.h>
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#include <errno.h>
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#include <osmocom/core/sockaddr_str.h>
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#include <osmocom/gsm/gsup.h>
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#include <osmocom/mslookup/mslookup.h>
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#include <osmocom/hlr/logging.h>
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#include <osmocom/hlr/hlr.h>
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#include <osmocom/hlr/db.h>
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#include <osmocom/hlr/timestamp.h>
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#include <osmocom/hlr/mslookup_server.h>
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#include <osmocom/hlr/proxy.h>
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static const struct osmo_mslookup_result not_found = {
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.rc = OSMO_MSLOOKUP_RC_NOT_FOUND,
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};
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const struct osmo_ipa_name mslookup_server_msc_wildcard = {};
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static void set_result(struct osmo_mslookup_result *result,
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const struct mslookup_service_host *service_host,
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uint32_t age)
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{
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if (!osmo_sockaddr_str_is_nonzero(&service_host->host_v4)
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&& !osmo_sockaddr_str_is_nonzero(&service_host->host_v6)) {
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*result = not_found;
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return;
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}
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result->rc = OSMO_MSLOOKUP_RC_RESULT;
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result->host_v4 = service_host->host_v4;
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result->host_v6 = service_host->host_v6;
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result->age = age;
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}
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const struct mslookup_service_host *mslookup_server_get_local_gsup_addr(void)
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{
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static struct mslookup_service_host gsup_bind = {};
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struct mslookup_service_host *host;
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/* Find a HLR/GSUP service set for the server (no VLR unit name) */
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host = mslookup_server_service_get(&mslookup_server_msc_wildcard, OSMO_MSLOOKUP_SERVICE_HLR_GSUP);
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if (host)
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return host;
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/* Try to use the locally configured GSUP bind address */
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osmo_sockaddr_str_from_str(&gsup_bind.host_v4, g_hlr->gsup_bind_addr, OSMO_GSUP_PORT);
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if (gsup_bind.host_v4.af == AF_INET6) {
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gsup_bind.host_v6 = gsup_bind.host_v4;
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gsup_bind.host_v4 = (struct osmo_sockaddr_str){};
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}
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return &gsup_bind;
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}
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struct mslookup_server_msc_cfg *mslookup_server_msc_get(const struct osmo_ipa_name *msc_name, bool create)
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{
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struct llist_head *c = &g_hlr->mslookup.server.local_site_services;
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struct mslookup_server_msc_cfg *msc;
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if (!msc_name)
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return NULL;
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llist_for_each_entry(msc, c, entry) {
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if (osmo_ipa_name_cmp(&msc->name, msc_name))
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continue;
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return msc;
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}
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if (!create)
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return NULL;
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msc = talloc_zero(g_hlr, struct mslookup_server_msc_cfg);
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OSMO_ASSERT(msc);
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INIT_LLIST_HEAD(&msc->service_hosts);
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msc->name = *msc_name;
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llist_add_tail(&msc->entry, c);
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return msc;
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}
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struct mslookup_service_host *mslookup_server_msc_service_get(struct mslookup_server_msc_cfg *msc, const char *service,
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bool create)
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{
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struct mslookup_service_host *e;
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if (!msc)
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return NULL;
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llist_for_each_entry(e, &msc->service_hosts, entry) {
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if (!strcmp(e->service, service))
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return e;
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}
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if (!create)
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return NULL;
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e = talloc_zero(msc, struct mslookup_service_host);
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OSMO_ASSERT(e);
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OSMO_STRLCPY_ARRAY(e->service, service);
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llist_add_tail(&e->entry, &msc->service_hosts);
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return e;
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}
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struct mslookup_service_host *mslookup_server_service_get(const struct osmo_ipa_name *msc_name, const char *service)
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{
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struct mslookup_server_msc_cfg *msc = mslookup_server_msc_get(msc_name, false);
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if (!msc)
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return NULL;
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return mslookup_server_msc_service_get(msc, service, false);
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}
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int mslookup_server_msc_service_set(struct mslookup_server_msc_cfg *msc, const char *service,
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const struct osmo_sockaddr_str *addr)
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{
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struct mslookup_service_host *e;
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if (!service || !service[0]
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|| strlen(service) > OSMO_MSLOOKUP_SERVICE_MAXLEN)
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return -EINVAL;
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if (!addr || !osmo_sockaddr_str_is_nonzero(addr))
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return -EINVAL;
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e = mslookup_server_msc_service_get(msc, service, true);
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if (!e)
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return -EINVAL;
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switch (addr->af) {
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case AF_INET:
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e->host_v4 = *addr;
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break;
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case AF_INET6:
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e->host_v6 = *addr;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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int mslookup_server_msc_service_del(struct mslookup_server_msc_cfg *msc, const char *service,
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const struct osmo_sockaddr_str *addr)
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{
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struct mslookup_service_host *e, *n;
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int deleted = 0;
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if (!msc)
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return -ENOENT;
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llist_for_each_entry_safe(e, n, &msc->service_hosts, entry) {
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if (service && strcmp(service, e->service))
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continue;
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if (addr) {
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if (!osmo_sockaddr_str_cmp(addr, &e->host_v4)) {
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e->host_v4 = (struct osmo_sockaddr_str){};
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/* Removed one addr. If the other is still there, keep the entry. */
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if (osmo_sockaddr_str_is_nonzero(&e->host_v6))
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continue;
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} else if (!osmo_sockaddr_str_cmp(addr, &e->host_v6)) {
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e->host_v6 = (struct osmo_sockaddr_str){};
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/* Removed one addr. If the other is still there, keep the entry. */
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if (osmo_sockaddr_str_is_nonzero(&e->host_v4))
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continue;
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} else
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/* No addr match, keep the entry. */
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continue;
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/* Addr matched and none is left. Delete. */
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}
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llist_del(&e->entry);
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talloc_free(e);
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deleted++;
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}
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return deleted;
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}
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/* A remote entity is asking us whether we are the home HLR of the given subscriber. */
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static void mslookup_server_rx_hlr_gsup(const struct osmo_mslookup_query *query,
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struct osmo_mslookup_result *result)
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{
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const struct mslookup_service_host *host;
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int rc;
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switch (query->id.type) {
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case OSMO_MSLOOKUP_ID_IMSI:
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rc = db_subscr_exists_by_imsi(g_hlr->dbc, query->id.imsi);
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break;
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case OSMO_MSLOOKUP_ID_MSISDN:
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rc = db_subscr_exists_by_msisdn(g_hlr->dbc, query->id.msisdn);
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break;
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default:
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LOGP(DMSLOOKUP, LOGL_ERROR, "Unknown mslookup ID type: %d\n", query->id.type);
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*result = not_found;
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return;
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}
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if (rc) {
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LOGP(DMSLOOKUP, LOGL_DEBUG, "%s: does not exist in local HLR\n",
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osmo_mslookup_result_name_c(OTC_SELECT, query, NULL));
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*result = not_found;
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return;
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}
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LOGP(DMSLOOKUP, LOGL_DEBUG, "%s: found in local HLR\n",
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osmo_mslookup_result_name_c(OTC_SELECT, query, NULL));
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host = mslookup_server_get_local_gsup_addr();
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set_result(result, host, 0);
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if (result->rc != OSMO_MSLOOKUP_RC_RESULT) {
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LOGP(DMSLOOKUP, LOGL_ERROR,
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"Subscriber found, but error in service '" OSMO_MSLOOKUP_SERVICE_HLR_GSUP "' config:"
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" v4: " OSMO_SOCKADDR_STR_FMT " v6: " OSMO_SOCKADDR_STR_FMT "\n",
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OSMO_SOCKADDR_STR_FMT_ARGS(&host->host_v4),
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OSMO_SOCKADDR_STR_FMT_ARGS(&host->host_v6));
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}
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}
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/* Look in the local HLR record: If the subscriber is "at home" in this HLR and is also currently located at a local
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* VLR, we will find a valid location updating with vlr_number, and no vlr_via_proxy entry. */
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static bool subscriber_has_done_lu_here_hlr(const struct osmo_mslookup_query *query,
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uint32_t *lu_age,
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struct osmo_ipa_name *local_msc_name,
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struct hlr_subscriber *ret_subscr)
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{
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struct hlr_subscriber _subscr;
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int rc;
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uint32_t age;
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struct hlr_subscriber *subscr = ret_subscr ? : &_subscr;
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switch (query->id.type) {
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case OSMO_MSLOOKUP_ID_IMSI:
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rc = db_subscr_get_by_imsi(g_hlr->dbc, query->id.imsi, subscr);
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break;
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case OSMO_MSLOOKUP_ID_MSISDN:
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rc = db_subscr_get_by_msisdn(g_hlr->dbc, query->id.msisdn, subscr);
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break;
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default:
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LOGP(DMSLOOKUP, LOGL_ERROR, "Unknown mslookup ID type: %d\n", query->id.type);
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return false;
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}
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if (rc) {
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LOGP(DMSLOOKUP, LOGL_DEBUG, "%s: does not exist in local HLR\n",
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osmo_mslookup_result_name_c(OTC_SELECT, query, NULL));
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return false;
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}
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if (!subscr->vlr_number[0]) {
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LOGP(DMSLOOKUP, LOGL_DEBUG, "%s: not attached (vlr_number unset)\n",
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osmo_mslookup_result_name_c(OTC_SELECT, query, NULL));
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return false;
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}
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if (subscr->vlr_via_proxy.len) {
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/* The VLR is behind a proxy, the subscriber is not attached to a local VLR but a remote one. That
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* remote proxy should instead respond to the service lookup request. */
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LOGP(DMSLOOKUP, LOGL_DEBUG, "%s: last attach is not at local VLR, but at VLR '%s' via proxy %s\n",
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osmo_mslookup_result_name_c(OTC_SELECT, query, NULL),
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subscr->vlr_number,
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osmo_ipa_name_to_str(&subscr->vlr_via_proxy));
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return false;
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}
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if (!timestamp_age(&subscr->last_lu_seen, &age)) {
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LOGP(DMSLOOKUP, LOGL_DEBUG, "%s: Invalid last_lu_seen timestamp for subscriber\n",
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osmo_mslookup_result_name_c(OTC_SELECT, query, NULL));
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return false;
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}
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if (age > g_hlr->mslookup.server.local_attach_max_age) {
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LOGP(DMSLOOKUP, LOGL_DEBUG, "%s: last attach was here, but too long ago: %us > %us\n",
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osmo_mslookup_result_name_c(OTC_SELECT, query, NULL),
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age, g_hlr->mslookup.server.local_attach_max_age);
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return false;
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}
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*lu_age = age;
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osmo_ipa_name_set_str(local_msc_name, subscr->vlr_number);
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LOGP(DMSLOOKUP, LOGL_DEBUG, "%s: attached %u seconds ago at local VLR %s\n",
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osmo_mslookup_result_name_c(OTC_SELECT, query, NULL),
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age, osmo_ipa_name_to_str(local_msc_name));
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return true;
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}
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/* Determine whether the subscriber with the given ID has routed a Location Updating via this HLR as first hop. Return
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* true if it is attached at a local VLR, and we are serving as proxy for a remote home HLR.
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*/
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static bool subscriber_has_done_lu_here_proxy(const struct osmo_mslookup_query *query,
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uint32_t *lu_age,
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struct osmo_ipa_name *local_msc_name,
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struct proxy_subscr *ret_proxy_subscr)
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{
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struct proxy_subscr proxy_subscr;
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uint32_t age;
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int rc;
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/* See the local HLR record. If the subscriber is "at home" in this HLR and is also currently located here, we
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* will find a valid location updating and no vlr_via_proxy entry. */
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switch (query->id.type) {
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case OSMO_MSLOOKUP_ID_IMSI:
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rc = proxy_subscr_get_by_imsi(&proxy_subscr, g_hlr->gs->proxy, query->id.imsi);
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break;
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case OSMO_MSLOOKUP_ID_MSISDN:
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rc = proxy_subscr_get_by_msisdn(&proxy_subscr, g_hlr->gs->proxy, query->id.msisdn);
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break;
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default:
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LOGP(DDGSM, LOGL_ERROR, "%s: unknown ID type\n",
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osmo_mslookup_result_name_c(OTC_SELECT, query, NULL));
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return false;
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}
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if (rc) {
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LOGP(DDGSM, LOGL_DEBUG, "%s: does not exist in GSUP proxy\n",
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osmo_mslookup_result_name_c(OTC_SELECT, query, NULL));
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return false;
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}
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/* We only need to care about CS LU, since only CS services need D-GSM routing. */
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if (!timestamp_age(&proxy_subscr.cs.last_lu, &age)
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|| age > g_hlr->mslookup.server.local_attach_max_age) {
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LOGP(DDGSM, LOGL_ERROR,
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"%s: last attach was at local VLR (proxying for remote HLR), but too long ago: %us > %us\n",
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osmo_mslookup_result_name_c(OTC_SELECT, query, NULL),
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age, g_hlr->mslookup.server.local_attach_max_age);
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return false;
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}
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if (proxy_subscr.cs.vlr_via_proxy.len) {
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LOGP(DDGSM, LOGL_DEBUG, "%s: last attach is not at local VLR, but at VLR '%s' via proxy '%s'\n",
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osmo_mslookup_result_name_c(OTC_SELECT, query, NULL),
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osmo_ipa_name_to_str(&proxy_subscr.cs.vlr_name),
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osmo_ipa_name_to_str(&proxy_subscr.cs.vlr_via_proxy));
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return false;
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}
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*lu_age = age;
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*local_msc_name = proxy_subscr.cs.vlr_name;
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LOGP(DDGSM, LOGL_DEBUG, "%s: attached %u seconds ago at local VLR %s; proxying for remote HLR "
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OSMO_SOCKADDR_STR_FMT "\n",
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osmo_mslookup_result_name_c(OTC_SELECT, query, NULL),
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age, osmo_ipa_name_to_str(local_msc_name),
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OSMO_SOCKADDR_STR_FMT_ARGS(&proxy_subscr.remote_hlr_addr));
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if (ret_proxy_subscr)
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*ret_proxy_subscr = proxy_subscr;
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return true;
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}
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bool subscriber_has_done_lu_here(const struct osmo_mslookup_query *query,
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uint32_t *lu_age_p, struct osmo_ipa_name *local_msc_name,
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char *ret_imsi, size_t ret_imsi_len)
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{
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bool attached_here;
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uint32_t lu_age = 0;
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struct osmo_ipa_name msc_name = {};
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bool attached_here_proxy;
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uint32_t proxy_lu_age = 0;
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struct osmo_ipa_name proxy_msc_name = {};
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struct proxy_subscr proxy_subscr;
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struct hlr_subscriber db_subscr;
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/* First ask the local HLR db, but if the local proxy record indicates a more recent LU, use that instead.
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* For all usual cases, only one of these will reflect a LU, even if a subscriber had more than one home HLR:
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* - if the subscriber is known here, we will never proxy.
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* - if the subscriber is not known here, this local HLR db will never record a LU.
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* However, if a subscriber was being proxied to a remote home HLR, and if then the subscriber was also added to
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* the local HLR database, there might occur a situation where both reflect a LU. So, to be safe against all
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* situations, compare the two entries.
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*/
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attached_here = subscriber_has_done_lu_here_hlr(query, &lu_age, &msc_name, &db_subscr);
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attached_here_proxy = subscriber_has_done_lu_here_proxy(query, &proxy_lu_age, &proxy_msc_name, &proxy_subscr);
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/* If proxy has a younger lu, replace. */
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if (attached_here_proxy && (!attached_here || (proxy_lu_age < lu_age))) {
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attached_here = true;
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lu_age = proxy_lu_age;
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msc_name = proxy_msc_name;
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if (ret_imsi)
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osmo_strlcpy(ret_imsi, proxy_subscr.imsi, ret_imsi_len);
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} else if (attached_here) {
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if (ret_imsi)
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osmo_strlcpy(ret_imsi, db_subscr.imsi, ret_imsi_len);
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}
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if (attached_here && !msc_name.len) {
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LOGP(DMSLOOKUP, LOGL_ERROR, "%s: attached here, but no VLR name known\n",
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osmo_mslookup_result_name_c(OTC_SELECT, query, NULL));
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return false;
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}
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if (!attached_here) {
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/* Already logged "not attached" for both local-db and proxy attach */
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return false;
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}
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LOGP(DMSLOOKUP, LOGL_INFO, "%s: attached here, at VLR %s\n",
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osmo_mslookup_result_name_c(OTC_SELECT, query, NULL),
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osmo_ipa_name_to_str(&msc_name));
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*lu_age_p = lu_age;
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*local_msc_name = msc_name;
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return true;
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}
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/* A remote entity is asking us whether we are providing the given service for the given subscriber. */
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void mslookup_server_rx(const struct osmo_mslookup_query *query,
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struct osmo_mslookup_result *result)
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{
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const struct mslookup_service_host *service_host;
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uint32_t age;
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struct osmo_ipa_name msc_name;
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/* A request for a home HLR: answer exactly if this is the subscriber's home HLR, i.e. the IMSI is listed in the
|
|
* HLR database. */
|
|
if (strcmp(query->service, OSMO_MSLOOKUP_SERVICE_HLR_GSUP) == 0)
|
|
return mslookup_server_rx_hlr_gsup(query, result);
|
|
|
|
/* All other service types: answer when the subscriber has done a LU that is either listed in the local HLR or
|
|
* in the GSUP proxy database: i.e. if the subscriber has done a Location Updating at an VLR belonging to this
|
|
* HLR. Respond with whichever services are configured in the osmo-hlr.cfg. */
|
|
if (!subscriber_has_done_lu_here(query, &age, &msc_name, NULL, 0)) {
|
|
*result = not_found;
|
|
return;
|
|
}
|
|
|
|
/* We've detected a LU here. The VLR where the LU happened is stored in msc_unit_name, and the LU age is stored
|
|
* in 'age'. Figure out the address configured for that VLR and service name. */
|
|
service_host = mslookup_server_service_get(&msc_name, query->service);
|
|
|
|
if (!service_host) {
|
|
/* Find such service set globally (no VLR unit name) */
|
|
service_host = mslookup_server_service_get(&mslookup_server_msc_wildcard, query->service);
|
|
}
|
|
|
|
if (!service_host) {
|
|
LOGP(DMSLOOKUP, LOGL_ERROR,
|
|
"%s: subscriber found, but no service %s configured, cannot service lookup request\n",
|
|
osmo_mslookup_result_name_c(OTC_SELECT, query, NULL),
|
|
osmo_quote_str_c(OTC_SELECT, query->service, -1));
|
|
*result = not_found;
|
|
return;
|
|
}
|
|
|
|
set_result(result, service_host, age);
|
|
}
|