655 lines
21 KiB
C
655 lines
21 KiB
C
/* (C) 2017 by sysmocom s.f.m.c. GmbH
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* (C) 2018 by Harald Welte <laforge@gnumonks.org>
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* All Rights Reserved
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*
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* Author: Philipp Maier
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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 <osmocom/core/utils.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/logging.h>
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#include <osmocom/sigtran/sccp_helpers.h>
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#include <osmocom/sigtran/sccp_sap.h>
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#include <osmocom/sigtran/osmo_ss7.h>
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#include <osmocom/sigtran/protocol/m3ua.h>
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#include <osmocom/gsm/gsm0808.h>
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#include <osmocom/gsm/protocol/gsm_08_08.h>
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#include <osmocom/gsm/protocol/gsm_04_08.h>
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#include <osmocom/gsm/gsm0808_utils.h>
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#include <osmocom/msc/debug.h>
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#include <osmocom/msc/msc_ifaces.h>
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#include <osmocom/msc/a_iface.h>
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#include <osmocom/msc/a_iface_bssap.h>
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#include <osmocom/msc/transaction.h>
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#include <osmocom/mgcp_client/mgcp_client.h>
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#include <osmocom/core/byteswap.h>
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#include <osmocom/sccp/sccp_types.h>
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#include <osmocom/msc/a_reset.h>
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#include <osmocom/msc/osmo_msc.h>
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#include <osmocom/msc/vlr.h>
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#include <errno.h>
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/* A pointer to the GSM network we work with. By the current paradigm,
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* there can only be one gsm_network per MSC. The pointer is set once
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* when calling a_init() */
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static struct gsm_network *gsm_network = NULL;
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/* A struct to track currently active connections. We need that information
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* to handle failure sitautions. In case of a problem, we must know which
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* connections are currently open and which BSC is responsible. We also need
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* the data to perform our connection checks (a_reset). All other logic will
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* look at the connection ids and addresses that are supplied by the
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* primitives */
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struct bsc_conn {
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struct llist_head list;
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uint32_t conn_id; /* Connection identifier */
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struct bsc_context *bsc;
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};
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/* Internal list with connections we currently maintain. This
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* list is of type struct bsc_conn (see above) */
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static LLIST_HEAD(active_connections);
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/* Record info of a new active connection in the active connection list */
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static void record_bsc_con(const void *ctx, struct bsc_context *bsc, uint32_t conn_id)
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{
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struct bsc_conn *conn;
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conn = talloc_zero(ctx, struct bsc_conn);
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OSMO_ASSERT(conn);
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conn->conn_id = conn_id;
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conn->bsc = bsc;
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llist_add_tail(&conn->list, &active_connections);
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}
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/* Delete info of a closed connection from the active connection list */
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void a_delete_bsc_con(uint32_t conn_id)
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{
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struct bsc_conn *conn;
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struct bsc_conn *conn_temp;
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llist_for_each_entry_safe(conn, conn_temp, &active_connections, list) {
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if (conn->conn_id == conn_id) {
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LOGPBSCCONN(conn, LOGL_DEBUG, "Removing A-interface conn\n");
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llist_del(&conn->list);
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talloc_free(conn);
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}
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}
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}
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/* Find a specified connection id */
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static struct bsc_conn *find_bsc_con(uint32_t conn_id)
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{
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struct bsc_conn *conn;
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/* Find the address for the current connection id */
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llist_for_each_entry(conn, &active_connections, list) {
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if (conn->conn_id == conn_id) {
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return conn;
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}
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}
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return NULL;
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}
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/* Check if a specified connection id has an active SCCP connection */
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static bool check_connection_active(uint32_t conn_id)
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{
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if (find_bsc_con(conn_id))
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return true;
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else
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return false;
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}
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/* Get the context for a specific calling (BSC) address */
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static struct bsc_context *get_bsc_context_by_sccp_addr(const struct osmo_sccp_addr *addr)
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{
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struct bsc_context *bsc_ctx;
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struct osmo_ss7_instance *ss7;
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if (!addr)
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return NULL;
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llist_for_each_entry(bsc_ctx, &gsm_network->a.bscs, list) {
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if (memcmp(&bsc_ctx->bsc_addr, addr, sizeof(*addr)) == 0)
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return bsc_ctx;
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}
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ss7 = osmo_ss7_instance_find(gsm_network->a.cs7_instance);
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OSMO_ASSERT(ss7);
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LOGP(DBSSAP, LOGL_NOTICE, "The calling BSC (%s) is unknown to this MSC ...\n",
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osmo_sccp_addr_name(ss7, addr));
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return NULL;
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}
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/* Send DTAP message via A-interface, take ownership of msg */
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int a_iface_tx_dtap(struct msgb *msg)
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{
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struct gsm_subscriber_connection *conn;
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struct msgb *msg_resp;
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uint8_t link_id = OMSC_LINKID_CB(msg);
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OSMO_ASSERT(msg);
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conn = (struct gsm_subscriber_connection *)msg->dst;
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OSMO_ASSERT(conn);
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OSMO_ASSERT(conn->a.scu);
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LOGPCONN(conn, LOGL_DEBUG, "Passing DTAP message (DLCI=0x%02x) from MSC to BSC\n", link_id);
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msg->l3h = msg->data;
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msg_resp = gsm0808_create_dtap(msg, link_id);
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/* gsm0808_create_dtap() has copied the data to msg_resp,
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* so msg has served its purpose now */
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msgb_free(msg);
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if (!msg_resp) {
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LOGPCONN(conn, LOGL_ERROR, "Unable to generate BSSMAP DTAP message!\n");
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return -EINVAL;
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}
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LOGPCONN(conn, LOGL_DEBUG, "N-DATA.req(%s)\n", msgb_hexdump_l2(msg_resp));
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/* osmo_sccp_tx_data_msg() takes ownership of msg_resp */
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return osmo_sccp_tx_data_msg(conn->a.scu, conn->a.conn_id, msg_resp);
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}
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/* Send Cipher mode command via A-interface */
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int a_iface_tx_cipher_mode(const struct gsm_subscriber_connection *conn,
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struct gsm0808_encrypt_info *ei, int include_imeisv)
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{
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/* TODO generalize for A- and Iu interfaces, don't name after 08.08 */
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struct msgb *msg_resp;
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uint8_t crm = 0x01;
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OSMO_ASSERT(conn);
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LOGPCONN(conn, LOGL_DEBUG, "Tx BSSMAP CIPHER MODE COMMAND to BSC, %u ciphers (%s)",
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ei->perm_algo_len, osmo_hexdump_nospc(ei->perm_algo, ei->perm_algo_len));
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LOGPC(DBSSAP, LOGL_DEBUG, " key %s\n", osmo_hexdump_nospc(ei->key, ei->key_len));
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msg_resp = gsm0808_create_cipher(ei, include_imeisv ? &crm : NULL);
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LOGPCONN(conn, LOGL_DEBUG, "N-DATA.req(%s)\n", msgb_hexdump_l2(msg_resp));
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return osmo_sccp_tx_data_msg(conn->a.scu, conn->a.conn_id, msg_resp);
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}
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/* Page a subscriber via A-interface */
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int a_iface_tx_paging(const char *imsi, uint32_t tmsi, uint16_t lac)
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{
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struct bsc_context *bsc_ctx;
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struct gsm0808_cell_id_list2 cil;
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struct msgb *msg;
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int page_count = 0;
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struct osmo_ss7_instance *ss7;
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OSMO_ASSERT(imsi);
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cil.id_discr = CELL_IDENT_LAC;
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cil.id_list[0].lac = lac;
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cil.id_list_len = 1;
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ss7 = osmo_ss7_instance_find(gsm_network->a.cs7_instance);
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OSMO_ASSERT(ss7);
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/* Deliver paging request to all known BSCs */
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llist_for_each_entry(bsc_ctx, &gsm_network->a.bscs, list) {
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if (a_reset_conn_ready(bsc_ctx->reset_fsm)) {
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LOGP(DBSSAP, LOGL_DEBUG,
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"Tx BSSMAP paging message from MSC %s to BSC %s (imsi=%s, tmsi=0x%08x, lac=%u)\n",
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osmo_sccp_addr_name(ss7, &bsc_ctx->msc_addr),
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osmo_sccp_addr_name(ss7, &bsc_ctx->bsc_addr), imsi, tmsi, lac);
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msg = gsm0808_create_paging2(imsi, &tmsi, &cil, NULL);
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osmo_sccp_tx_unitdata_msg(bsc_ctx->sccp_user,
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&bsc_ctx->msc_addr, &bsc_ctx->bsc_addr, msg);
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page_count++;
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} else {
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LOGP(DBSSAP, LOGL_DEBUG,
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"Connection down, dropping paging from MSC %s to BSC %s (imsi=%s, tmsi=0x%08x, lac=%u)\n",
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osmo_sccp_addr_name(ss7, &bsc_ctx->msc_addr),
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osmo_sccp_addr_name(ss7, &bsc_ctx->bsc_addr), imsi, tmsi, lac);
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}
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}
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if (page_count <= 0)
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LOGP(DBSSAP, LOGL_ERROR, "Could not deliver paging because none of the associated BSCs is available!\n");
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return page_count;
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}
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/* Convert speech version field */
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static uint8_t convert_speech_version_l3_to_A(int speech_ver)
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{
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/* The speech versions that are transmitted in the Bearer capability
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* information element, that is transmitted on the Layer 3 (CC)
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* use a different encoding than the permitted speech version
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* identifier, that is signalled in the channel type element on the A
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* interface. (See also 3GPP TS 48.008, 3.2.2.1 and 3GPP TS 24.008,
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* 10.5.103 */
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switch (speech_ver) {
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case GSM48_BCAP_SV_FR:
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return GSM0808_PERM_FR1;
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case GSM48_BCAP_SV_HR:
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return GSM0808_PERM_HR1;
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case GSM48_BCAP_SV_EFR:
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return GSM0808_PERM_FR2;
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case GSM48_BCAP_SV_AMR_F:
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return GSM0808_PERM_FR3;
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case GSM48_BCAP_SV_AMR_H:
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return GSM0808_PERM_HR3;
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case GSM48_BCAP_SV_AMR_OFW:
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return GSM0808_PERM_FR4;
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case GSM48_BCAP_SV_AMR_OHW:
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return GSM0808_PERM_HR4;
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case GSM48_BCAP_SV_AMR_FW:
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return GSM0808_PERM_FR5;
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case GSM48_BCAP_SV_AMR_OH:
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return GSM0808_PERM_HR6;
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}
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/* If nothing matches, tag the result as invalid */
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LOGP(DBSSAP, LOGL_ERROR, "Invalid permitted speech version: %d\n", speech_ver);
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return 0xFF;
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}
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/* Convert speech preference field */
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static uint8_t convert_speech_pref_l3_to_A(int radio)
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{
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/* The Radio channel requirement field that is transmitted in the
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* Bearer capability information element, that is transmitted on the
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* Layer 3 (CC) uses a different encoding than the Channel rate and
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* type field that is signalled in the channel type element on the A
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* interface. (See also 3GPP TS 48.008, 3.2.2.1 and 3GPP TS 24.008,
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* 10.5.102 */
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switch (radio) {
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case GSM48_BCAP_RRQ_FR_ONLY:
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return GSM0808_SPEECH_FULL_BM;
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case GSM48_BCAP_RRQ_DUAL_FR:
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return GSM0808_SPEECH_FULL_PREF;
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case GSM48_BCAP_RRQ_DUAL_HR:
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return GSM0808_SPEECH_HALF_PREF;
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}
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LOGP(DBSSAP, LOGL_ERROR, "Invalid radio channel preference: %d; defaulting to full rate.\n",
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radio);
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return GSM0808_SPEECH_FULL_BM;
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}
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/* Assemble the channel type field */
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static int enc_channel_type(struct gsm0808_channel_type *ct, const struct gsm_mncc_bearer_cap *bc)
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{
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unsigned int i;
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uint8_t sv;
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unsigned int count = 0;
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bool only_gsm_hr = true;
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OSMO_ASSERT(ct);
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OSMO_ASSERT(bc);
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ct->ch_indctr = GSM0808_CHAN_SPEECH;
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for (i = 0; i < ARRAY_SIZE(bc->speech_ver); i++) {
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if (bc->speech_ver[i] == -1)
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break;
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sv = convert_speech_version_l3_to_A(bc->speech_ver[i]);
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if (sv != 0xFF) {
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/* Detect if something else than
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* GSM HR V1 is supported */
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if (sv == GSM0808_PERM_HR2 ||
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sv == GSM0808_PERM_HR3 || sv == GSM0808_PERM_HR4 || sv == GSM0808_PERM_HR6)
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only_gsm_hr = false;
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ct->perm_spch[count] = sv;
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count++;
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}
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}
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ct->perm_spch_len = count;
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if (only_gsm_hr)
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/* Note: We must avoid the usage of GSM HR1 as this
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* codec only offers very poor audio quality. If the
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* MS only supports GSM HR1 (and full rate), and has
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* a preference for half rate. Then we will ignore the
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* preference and assume a preference for full rate. */
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ct->ch_rate_type = GSM0808_SPEECH_FULL_BM;
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else
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ct->ch_rate_type = convert_speech_pref_l3_to_A(bc->radio);
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if (count)
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return 0;
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else
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return -EINVAL;
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}
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/* Assemble the speech codec field */
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static int enc_speech_codec_list(struct gsm0808_speech_codec_list *scl, const struct gsm0808_channel_type *ct)
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{
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unsigned int i;
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int rc;
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memset(scl, 0, sizeof(*scl));
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for (i = 0; i < ct->perm_spch_len; i++) {
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rc = gsm0808_speech_codec_from_chan_type(&scl->codec[i], ct->perm_spch[i]);
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if (rc != 0)
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return -EINVAL;
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}
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scl->len = i;
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return 0;
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}
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/* Send assignment request via A-interface */
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int a_iface_tx_assignment(const struct gsm_trans *trans)
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{
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struct gsm_subscriber_connection *conn;
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struct gsm0808_channel_type ct;
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struct gsm0808_speech_codec_list scl;
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uint32_t *ci_ptr = NULL;
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struct msgb *msg;
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struct sockaddr_storage rtp_addr;
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struct sockaddr_in rtp_addr_in;
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int rc;
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OSMO_ASSERT(trans);
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conn = trans->conn;
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OSMO_ASSERT(conn);
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LOGPCONN(conn, LOGL_DEBUG, "Tx BSSMAP ASSIGNMENT COMMAND to BSC\n");
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/* Channel type */
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rc = enc_channel_type(&ct, &trans->bearer_cap);
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if (rc < 0) {
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LOGPCONN(conn, LOGL_ERROR, "Not sending Assignment to BSC: failed to generate channel type\n");
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return -EINVAL;
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}
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/* Speech codec list */
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rc = enc_speech_codec_list(&scl, &ct);
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if (rc < 0) {
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LOGPCONN(conn, LOGL_ERROR, "Not sending Assignment to BSC: failed to generate speech codec list\n");
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return -EINVAL;
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}
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/* Package RTP-Address data */
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memset(&rtp_addr_in, 0, sizeof(rtp_addr_in));
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rtp_addr_in.sin_family = AF_INET;
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rtp_addr_in.sin_port = osmo_htons(conn->rtp.local_port_ran);
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rtp_addr_in.sin_addr.s_addr = inet_addr(conn->rtp.local_addr_ran);
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if (rtp_addr_in.sin_addr.s_addr == INADDR_NONE) {
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LOGPCONN(conn, LOGL_ERROR, "Invalid RTP-Address -- assignment not sent!\n");
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return -EINVAL;
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}
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if (rtp_addr_in.sin_port == 0) {
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LOGPCONN(conn, LOGL_ERROR, "Invalid RTP-Port -- assignment not sent!\n");
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return -EINVAL;
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}
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memset(&rtp_addr, 0, sizeof(rtp_addr));
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memcpy(&rtp_addr, &rtp_addr_in, sizeof(rtp_addr_in));
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msg = gsm0808_create_ass(&ct, NULL, &rtp_addr, &scl, ci_ptr);
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LOGPCONN(conn, LOGL_DEBUG, "N-DATA.req(%s)\n", msgb_hexdump_l2(msg));
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return osmo_sccp_tx_data_msg(conn->a.scu, conn->a.conn_id, msg);
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}
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/* Send clear command via A-interface */
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int a_iface_tx_clear_cmd(struct gsm_subscriber_connection *conn)
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{
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struct msgb *msg;
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LOGPCONN(conn, LOGL_INFO, "Tx BSSMAP CLEAR COMMAND to BSC\n");
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msg = gsm0808_create_clear_command(GSM0808_CAUSE_CALL_CONTROL);
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return osmo_sccp_tx_data_msg(conn->a.scu, conn->a.conn_id, msg);
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}
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/* Callback function: Close all open connections */
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static void a_reset_cb(const void *priv)
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{
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struct msgb *msg;
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struct bsc_context *bsc_ctx = (struct bsc_context*) priv;
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struct osmo_ss7_instance *ss7;
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/* Skip if the A interface is not properly initalized yet */
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if (!gsm_network)
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return;
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/* Clear all now orphaned subscriber connections */
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a_clear_all(bsc_ctx->sccp_user, &bsc_ctx->bsc_addr);
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/* Send reset to the remote BSC */
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ss7 = osmo_ss7_instance_find(gsm_network->a.cs7_instance);
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OSMO_ASSERT(ss7);
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LOGP(DBSSAP, LOGL_NOTICE, "Tx BSSMAP RESET to BSC %s\n", osmo_sccp_addr_name(ss7, &bsc_ctx->bsc_addr));
|
|
msg = gsm0808_create_reset();
|
|
osmo_sccp_tx_unitdata_msg(bsc_ctx->sccp_user, &bsc_ctx->msc_addr,
|
|
&bsc_ctx->bsc_addr, msg);
|
|
}
|
|
|
|
/* Add a new BSC connection to our internal list with known BSCs */
|
|
static struct bsc_context *add_bsc(const struct osmo_sccp_addr *msc_addr,
|
|
const struct osmo_sccp_addr *bsc_addr, struct osmo_sccp_user *scu)
|
|
{
|
|
struct bsc_context *bsc_ctx;
|
|
struct osmo_ss7_instance *ss7;
|
|
|
|
ss7 = osmo_ss7_instance_find(gsm_network->a.cs7_instance);
|
|
OSMO_ASSERT(ss7);
|
|
LOGP(DBSSAP, LOGL_NOTICE, "Adding new BSC connection for BSC %s...\n", osmo_sccp_addr_name(ss7, bsc_addr));
|
|
|
|
/* Generate and fill up a new bsc context */
|
|
bsc_ctx = talloc_zero(gsm_network, struct bsc_context);
|
|
OSMO_ASSERT(bsc_ctx);
|
|
memcpy(&bsc_ctx->bsc_addr, bsc_addr, sizeof(*bsc_addr));
|
|
memcpy(&bsc_ctx->msc_addr, msc_addr, sizeof(*msc_addr));
|
|
bsc_ctx->sccp_user = scu;
|
|
llist_add_tail(&bsc_ctx->list, &gsm_network->a.bscs);
|
|
|
|
return bsc_ctx;
|
|
}
|
|
|
|
/* start the BSSMAP RESET fsm */
|
|
void a_start_reset(struct bsc_context *bsc_ctx, bool already_connected)
|
|
{
|
|
char bsc_name[32];
|
|
OSMO_ASSERT(bsc_ctx->reset_fsm == NULL);
|
|
/* Start reset procedure to make the new connection active */
|
|
snprintf(bsc_name, sizeof(bsc_name), "bsc-%i", bsc_ctx->bsc_addr.pc);
|
|
bsc_ctx->reset_fsm = a_reset_alloc(bsc_ctx, bsc_name, a_reset_cb, bsc_ctx, already_connected);
|
|
}
|
|
|
|
/* determine if given msg is BSSMAP RESET related (true) or not (false) */
|
|
static bool bssmap_is_reset(struct msgb *msg)
|
|
{
|
|
struct bssmap_header *bs = (struct bssmap_header *)msgb_l2(msg);
|
|
|
|
if (msgb_l2len(msg) < sizeof(*bs))
|
|
return false;
|
|
|
|
if (bs->type != BSSAP_MSG_BSS_MANAGEMENT)
|
|
return false;
|
|
|
|
if (msg->l2h[sizeof(*bs)] == BSS_MAP_MSG_RESET)
|
|
return true;
|
|
|
|
if (msg->l2h[sizeof(*bs)] == BSS_MAP_MSG_RESET_ACKNOWLEDGE)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
/* Callback function, called by the SSCP stack when data arrives */
|
|
static int sccp_sap_up(struct osmo_prim_hdr *oph, void *_scu)
|
|
{
|
|
struct osmo_sccp_user *scu = _scu;
|
|
struct osmo_scu_prim *scu_prim = (struct osmo_scu_prim *)oph;
|
|
int rc = 0;
|
|
struct a_conn_info a_conn_info;
|
|
struct bsc_conn *bsc_con;
|
|
|
|
memset(&a_conn_info, 0, sizeof(a_conn_info));
|
|
a_conn_info.network = gsm_network;
|
|
|
|
switch (OSMO_PRIM_HDR(&scu_prim->oph)) {
|
|
case OSMO_PRIM(OSMO_SCU_PRIM_N_CONNECT, PRIM_OP_INDICATION):
|
|
/* Handle inbound connection indication */
|
|
a_conn_info.conn_id = scu_prim->u.connect.conn_id;
|
|
a_conn_info.bsc = get_bsc_context_by_sccp_addr(&scu_prim->u.unitdata.calling_addr);
|
|
if (!a_conn_info.bsc) {
|
|
/* We haven't heard from this BSC before, allocate it */
|
|
a_conn_info.bsc = add_bsc(&scu_prim->u.connect.called_addr,
|
|
&scu_prim->u.connect.calling_addr, scu);
|
|
a_start_reset(a_conn_info.bsc, false);
|
|
} else {
|
|
/* This BSC is already known to us, check if we have been through reset yet */
|
|
if (a_reset_conn_ready(a_conn_info.bsc->reset_fsm) == false) {
|
|
LOGP(DBSSAP, LOGL_NOTICE, "Refusing N-CONNECT.ind(%u, %s), BSC not reset yet\n",
|
|
scu_prim->u.connect.conn_id, msgb_hexdump_l2(oph->msg));
|
|
rc = osmo_sccp_tx_disconn(scu, a_conn_info.conn_id, &a_conn_info.bsc->msc_addr,
|
|
SCCP_RETURN_CAUSE_UNQUALIFIED);
|
|
break;
|
|
}
|
|
|
|
osmo_sccp_tx_conn_resp(scu, scu_prim->u.connect.conn_id, &scu_prim->u.connect.called_addr, NULL, 0);
|
|
if (msgb_l2len(oph->msg) > 0) {
|
|
LOGP(DBSSAP, LOGL_DEBUG, "N-CONNECT.ind(%u, %s)\n",
|
|
scu_prim->u.connect.conn_id, msgb_hexdump_l2(oph->msg));
|
|
rc = a_sccp_rx_dt(scu, &a_conn_info, oph->msg);
|
|
} else {
|
|
LOGP(DBSSAP, LOGL_DEBUG, "N-CONNECT.ind(%u)\n", scu_prim->u.connect.conn_id);
|
|
rc = -ENODATA;
|
|
}
|
|
|
|
if (rc < 0) {
|
|
/* initial message (COMPL L3) caused some error, we didn't allocate
|
|
* a subscriber_conn and must close the connection again */
|
|
rc = osmo_sccp_tx_disconn(scu, a_conn_info.conn_id,
|
|
&a_conn_info.bsc->msc_addr,
|
|
SCCP_RETURN_CAUSE_UNQUALIFIED);
|
|
} else
|
|
record_bsc_con(scu, a_conn_info.bsc, scu_prim->u.connect.conn_id);
|
|
}
|
|
break;
|
|
|
|
case OSMO_PRIM(OSMO_SCU_PRIM_N_DATA, PRIM_OP_INDICATION):
|
|
/* Handle incoming connection oriented data */
|
|
bsc_con = find_bsc_con(scu_prim->u.data.conn_id);
|
|
if (!bsc_con) {
|
|
LOGP(DBSSAP, LOGL_ERROR, "N-DATA.ind(%u, %s) for unknown conn_id\n",
|
|
scu_prim->u.data.conn_id, msgb_hexdump_l2(oph->msg));
|
|
break;
|
|
}
|
|
a_conn_info.conn_id = scu_prim->u.data.conn_id;
|
|
a_conn_info.bsc = bsc_con->bsc;
|
|
LOGP(DBSSAP, LOGL_DEBUG, "N-DATA.ind(%u, %s)\n",
|
|
scu_prim->u.data.conn_id, msgb_hexdump_l2(oph->msg));
|
|
a_sccp_rx_dt(scu, &a_conn_info, oph->msg);
|
|
break;
|
|
|
|
case OSMO_PRIM(OSMO_SCU_PRIM_N_UNITDATA, PRIM_OP_INDICATION):
|
|
/* Handle inbound UNITDATA */
|
|
|
|
/* Get BSC context, create a new one if necessary */
|
|
a_conn_info.bsc = get_bsc_context_by_sccp_addr(&scu_prim->u.unitdata.calling_addr);
|
|
if (!a_conn_info.bsc) {
|
|
/* We haven't heard from this BSC before, allocate it */
|
|
a_conn_info.bsc = add_bsc(&scu_prim->u.unitdata.called_addr,
|
|
&scu_prim->u.unitdata.calling_addr, scu);
|
|
/* Make sure that reset procedure is started */
|
|
a_start_reset(a_conn_info.bsc, false);
|
|
}
|
|
|
|
/* As long as we are in the reset phase, only reset related BSSMAP messages may pass
|
|
* beond here. */
|
|
if (!bssmap_is_reset(oph->msg) && a_reset_conn_ready(a_conn_info.bsc->reset_fsm) == false) {
|
|
LOGP(DBSSAP, LOGL_NOTICE, "Ignoring N-UNITDATA.ind(%s), BSC not reset yet\n",
|
|
msgb_hexdump_l2(oph->msg));
|
|
break;
|
|
}
|
|
|
|
DEBUGP(DBSSAP, "N-UNITDATA.ind(%s)\n", msgb_hexdump_l2(oph->msg));
|
|
a_sccp_rx_udt(scu, &a_conn_info, oph->msg);
|
|
break;
|
|
|
|
default:
|
|
LOGP(DBSSAP, LOGL_ERROR, "Unhandled SIGTRAN operation %s on primitive %u\n",
|
|
get_value_string(osmo_prim_op_names, oph->operation), oph->primitive);
|
|
break;
|
|
}
|
|
|
|
/* We didn't transfer msgb ownership to any downstream functions so we rely on
|
|
* this single/central location to free() the msgb wrapping the primitive */
|
|
msgb_free(oph->msg);
|
|
return rc;
|
|
}
|
|
|
|
/* Clear all subscriber connections on a specified BSC */
|
|
void a_clear_all(struct osmo_sccp_user *scu, const struct osmo_sccp_addr *bsc_addr)
|
|
{
|
|
struct gsm_subscriber_connection *conn;
|
|
struct gsm_subscriber_connection *conn_temp;
|
|
struct gsm_network *network = gsm_network;
|
|
|
|
OSMO_ASSERT(scu);
|
|
OSMO_ASSERT(bsc_addr);
|
|
|
|
llist_for_each_entry_safe(conn, conn_temp, &network->subscr_conns, entry) {
|
|
/* Clear only A connections and connections that actually
|
|
* belong to the specified BSC */
|
|
if (conn->via_ran == RAN_GERAN_A && memcmp(bsc_addr, &conn->a.bsc_addr, sizeof(conn->a.bsc_addr)) == 0) {
|
|
uint32_t conn_id = conn->a.conn_id;
|
|
LOGPCONN(conn, LOGL_NOTICE, "Dropping orphaned subscriber connection\n");
|
|
/* This call will/may talloc_free(conn), so we must save conn_id above */
|
|
msc_clear_request(conn, GSM48_CC_CAUSE_SWITCH_CONG);
|
|
|
|
/* If there is still an SCCP connection active, remove it now */
|
|
if (check_connection_active(conn_id)) {
|
|
osmo_sccp_tx_disconn(scu, conn_id, bsc_addr,
|
|
SCCP_RELEASE_CAUSE_END_USER_ORIGINATED);
|
|
a_delete_bsc_con(conn_id);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Initalize A interface connection between to MSC and BSC */
|
|
int a_init(struct osmo_sccp_instance *sccp, struct gsm_network *network)
|
|
{
|
|
OSMO_ASSERT(sccp);
|
|
OSMO_ASSERT(network);
|
|
|
|
/* FIXME: Remove hardcoded parameters, use parameters in parameter list */
|
|
LOGP(DBSSAP, LOGL_NOTICE, "Initalizing SCCP connection to stp...\n");
|
|
|
|
/* Set GSM network variable, there can only be
|
|
* one network by design */
|
|
if (gsm_network != NULL) {
|
|
OSMO_ASSERT(gsm_network == network);
|
|
} else
|
|
gsm_network = network;
|
|
|
|
/* SCCP Protocol stack */
|
|
osmo_sccp_user_bind(sccp, "OsmoMSC-A", sccp_sap_up, SCCP_SSN_BSSAP);
|
|
|
|
return 0;
|
|
}
|