2022-07-20 14:32:01 +00:00
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/* Osmocom CBC (Cell Broacast Centre) */
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/* (C) 2019 by Harald Welte <laforge@gnumonks.org>
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* All Rights Reserved
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*
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* SPDX-License-Identifier: AGPL-3.0+
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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/linuxlist.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/core/utils.h>
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2022-07-20 14:57:08 +00:00
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#include <osmocom/cbc/cbc_message.h>
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2022-07-20 14:32:01 +00:00
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#include <osmocom/cbc/cbc_peer.h>
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2022-07-20 17:56:12 +00:00
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#include <osmocom/cbc/cbsp_link.h>
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#include <osmocom/cbc/sbcap_link.h>
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2022-07-22 14:12:22 +00:00
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#include <osmocom/cbc/debug.h>
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2022-07-20 14:32:01 +00:00
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const struct value_string cbc_peer_proto_name[] = {
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{ CBC_PEER_PROTO_CBSP, "CBSP" },
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{ CBC_PEER_PROTO_SABP, "SABP" },
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{ CBC_PEER_PROTO_SBcAP, "SBc-AP" },
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{ 0, NULL }
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};
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2022-07-22 14:12:22 +00:00
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const struct value_string cbc_peer_link_mode_names[] = {
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{ CBC_PEER_LINK_MODE_DISABLED, "disabled" },
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{ CBC_PEER_LINK_MODE_SERVER, "server" },
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{ CBC_PEER_LINK_MODE_CLIENT, "client" },
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{}
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};
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2022-07-20 14:32:01 +00:00
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/* create a new cbc_peer */
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struct cbc_peer *cbc_peer_create(const char *name, enum cbc_peer_protocol proto)
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{
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struct cbc_peer *peer;
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if (name && cbc_peer_by_name(name))
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return NULL;
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peer = talloc_zero(g_cbc, struct cbc_peer);
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if (!peer)
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return NULL;
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peer->proto = proto;
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peer->name = talloc_strdup(peer, name);
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llist_add_tail(&peer->list, &g_cbc->peers);
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return peer;
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}
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/* remove a cbc_peer */
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void cbc_peer_remove(struct cbc_peer *peer)
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{
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struct cbc_message *cbcmsg;
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2022-07-20 16:46:02 +00:00
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/* close any existing peer link connection */
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2022-07-20 14:32:01 +00:00
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switch (peer->proto) {
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case CBC_PEER_PROTO_CBSP:
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2022-07-20 16:46:02 +00:00
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if (peer->link.cbsp)
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cbc_cbsp_link_close(peer->link.cbsp);
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2022-07-20 14:32:01 +00:00
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break;
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2022-07-20 14:45:29 +00:00
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case CBC_PEER_PROTO_SBcAP:
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2022-07-20 16:46:02 +00:00
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if (peer->link.sbcap)
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cbc_sbcap_link_close(peer->link.sbcap);
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2022-07-20 14:45:29 +00:00
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break;
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case CBC_PEER_PROTO_SABP:
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2022-07-20 14:32:01 +00:00
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default:
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OSMO_ASSERT(0);
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}
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2022-07-20 16:46:02 +00:00
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/* iterate over messages; remove peer from all message_peers */
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2022-07-20 14:32:01 +00:00
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llist_for_each_entry(cbcmsg, &g_cbc->messages, list) {
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cbc_message_del_peer(cbcmsg, peer);
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}
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llist_del(&peer->list);
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talloc_free(peer);
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}
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/* look-up of cbc_peer by name */
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struct cbc_peer *cbc_peer_by_name(const char *name)
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{
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struct cbc_peer *peer;
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llist_for_each_entry(peer, &g_cbc->peers, list) {
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if (peer->name && !strcmp(name, peer->name))
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return peer;
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}
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return NULL;
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}
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/* look-up of cbc_peer by tuple of (remote host, protocol) */
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struct cbc_peer *cbc_peer_by_addr_proto(const char *remote_host, uint16_t remote_port,
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enum cbc_peer_protocol proto)
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{
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struct cbc_peer *peer;
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llist_for_each_entry(peer, &g_cbc->peers, list) {
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unsigned int i;
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for (i = 0; i < peer->num_remote_host; i++) {
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if (peer->proto != proto)
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continue;
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if (!strcasecmp(remote_host, peer->remote_host[i])) {
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if (peer->remote_port == -1)
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return peer;
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else if (remote_port == peer->remote_port)
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return peer;
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}
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}
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}
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return NULL;
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}
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2022-07-22 14:12:22 +00:00
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static int cbc_peer_apply_cfg_chg_cbsp(struct cbc_peer *peer)
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{
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struct cbc_cbsp_link *link = peer->link.cbsp;
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int rc = 0;
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switch (peer->link_mode) {
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case CBC_PEER_LINK_MODE_DISABLED:
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if (link) {
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LOGPCC(link, LOGL_NOTICE,
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"link mode changed to 'disabled', closing active link\n");
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cbc_cbsp_link_close(link);
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}
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/* Nothing to be done, cbc_cbsp_mgr->srv_link will refuse
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* accepting() disabled peers. */
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OSMO_ASSERT(!peer->link.cbsp);
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break;
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case CBC_PEER_LINK_MODE_SERVER:
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if (link && link->is_client) {
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LOGPCC(link, LOGL_NOTICE,
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"link mode changed 'client' -> 'server', closing active link\n");
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cbc_cbsp_link_close(link);
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}
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/* Nothing to be done, cbc_cbsp_mgr->srv_link will accept() and
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* recreate the link */
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OSMO_ASSERT(!peer->link.cbsp);
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break;
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case CBC_PEER_LINK_MODE_CLIENT:
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if (link) {
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if (link->is_client) {
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/* nothing to be done, cli link already created */
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break;
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}
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LOGPCC(link, LOGL_NOTICE,
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"link mode changed 'server' -> 'client', closing active link\n");
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cbc_cbsp_link_close(link);
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}
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OSMO_ASSERT(!peer->link.cbsp);
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link = cbc_cbsp_link_alloc(g_cbc->cbsp.mgr, peer);
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peer->link.cbsp = link;
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rc = cbc_cbsp_link_open_cli(link);
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break;
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}
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return rc;
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}
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static int cbc_peer_apply_cfg_chg_sbcap(struct cbc_peer *peer)
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{
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struct cbc_sbcap_link *link = peer->link.sbcap;
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int rc = 0;
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switch (peer->link_mode) {
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case CBC_PEER_LINK_MODE_DISABLED:
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if (link) {
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LOGPSBCAPC(link, LOGL_NOTICE,
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"link mode changed to 'disabled', closing active link\n");
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cbc_sbcap_link_close(link);
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}
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/* Nothing to be done, cbc_sbcap_mgr->srv_link will refuse
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* accepting() disabled peers. */
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OSMO_ASSERT(!peer->link.sbcap);
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break;
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case CBC_PEER_LINK_MODE_SERVER:
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if (link && link->is_client) {
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LOGPSBCAPC(link, LOGL_NOTICE,
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"link mode changed 'client' -> 'server', closing active link\n");
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cbc_sbcap_link_close(link);
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}
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/* Nothing to be done, cbc_sbcap_mgr->srv_link will accept() and
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* recreate the link */
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OSMO_ASSERT(!peer->link.sbcap);
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break;
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case CBC_PEER_LINK_MODE_CLIENT:
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if (link) {
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if (link->is_client) {
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/* nothing to be done, cli link already created */
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break;
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}
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LOGPSBCAPC(link, LOGL_NOTICE,
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"link mode changed 'server' -> 'client', closing active link\n");
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cbc_sbcap_link_close(link);
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}
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OSMO_ASSERT(!peer->link.sbcap);
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link = cbc_sbcap_link_alloc(g_cbc->sbcap.mgr, peer);
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peer->link.sbcap = link;
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rc = cbc_sbcap_link_open_cli(link);
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break;
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}
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return rc;
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}
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int cbc_peer_apply_cfg_chg(struct cbc_peer *peer)
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{
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int rc = -ENOTSUP;
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switch (peer->proto) {
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case CBC_PEER_PROTO_CBSP:
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rc = cbc_peer_apply_cfg_chg_cbsp(peer);
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break;
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case CBC_PEER_PROTO_SBcAP:
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rc = cbc_peer_apply_cfg_chg_sbcap(peer);
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break;
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case CBC_PEER_PROTO_SABP:
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break;
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}
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return rc;
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}
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