347 lines
9.6 KiB
C
347 lines
9.6 KiB
C
/* (C) 2023 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
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* All Rights Reserved
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*
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* Author: Neels Hofmeyr
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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/fsm.h>
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#include <osmocom/core/tdef.h>
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#include <osmocom/gsm/gsm23236.h>
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#include <osmocom/sigtran/sccp_helpers.h>
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#include <asn1c/asn1helpers.h>
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#include <osmocom/ranap/ranap_ies_defs.h>
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#include <osmocom/ranap/ranap_msg_factory.h>
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#include <osmocom/hnbgw/hnbgw.h>
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#include <osmocom/hnbgw/hnbgw_cn.h>
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#include <osmocom/hnbgw/tdefs.h>
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#include <osmocom/hnbgw/context_map.h>
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static struct osmo_fsm cnlink_fsm;
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enum cnlink_fsm_state {
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CNLINK_ST_DISC,
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CNLINK_ST_CONN,
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};
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enum cnlink_fsm_event {
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CNLINK_EV_RX_RESET,
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CNLINK_EV_RX_RESET_ACK,
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};
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static const struct value_string cnlink_fsm_event_names[] = {
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OSMO_VALUE_STRING(CNLINK_EV_RX_RESET),
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OSMO_VALUE_STRING(CNLINK_EV_RX_RESET_ACK),
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{}
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};
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static const struct osmo_tdef_state_timeout cnlink_timeouts[32] = {
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[CNLINK_ST_DISC] = { .T = 4 },
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};
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#define cnlink_fsm_state_chg(FI, STATE) \
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osmo_tdef_fsm_inst_state_chg(FI, STATE, \
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cnlink_timeouts, \
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hnbgw_T_defs, \
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-1)
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struct hnbgw_cnlink *cnlink_alloc(struct hnbgw_cnpool *cnpool, int nr)
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{
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struct osmo_fsm_inst *fi;
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struct hnbgw_cnlink *cnlink;
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char *name = talloc_asprintf(OTC_SELECT, "%s-%d", cnpool->peer_name, nr);
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fi = osmo_fsm_inst_alloc(&cnlink_fsm, g_hnbgw, NULL, LOGL_DEBUG, name);
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OSMO_ASSERT(fi);
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cnlink = talloc_zero(g_hnbgw, struct hnbgw_cnlink);
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fi->priv = cnlink;
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*cnlink = (struct hnbgw_cnlink){
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.name = name,
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.pool = cnpool,
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.fi = fi,
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.nr = nr,
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.vty = {
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/* VTY config defaults for the new cnlink */
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.nri_ranges = osmo_nri_ranges_alloc(cnlink),
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},
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.allow_attach = true,
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.ctrs = rate_ctr_group_alloc(g_hnbgw, cnpool->cnlink_ctrg_desc, nr),
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};
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talloc_steal(cnlink, name);
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INIT_LLIST_HEAD(&cnlink->map_list);
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INIT_LLIST_HEAD(&cnlink->paging);
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llist_add_tail(&cnlink->entry, &cnpool->cnlinks);
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LOG_CNLINK(cnlink, DCN, LOGL_DEBUG, "allocated\n");
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/* Immediately (1ms) kick off reset sending mechanism */
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osmo_fsm_inst_state_chg_ms(fi, CNLINK_ST_DISC, 1, 0);
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return cnlink;
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}
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void cnlink_term_and_free(struct hnbgw_cnlink *cnlink)
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{
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if (!cnlink)
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return;
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osmo_fsm_inst_term(cnlink->fi, OSMO_FSM_TERM_REQUEST, NULL);
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talloc_free(cnlink);
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}
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static void link_up(struct hnbgw_cnlink *cnlink)
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{
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LOGPFSML(cnlink->fi, LOGL_NOTICE, "link up\n");
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}
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static void link_lost(struct hnbgw_cnlink *cnlink)
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{
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struct hnbgw_context_map *map, *map2;
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LOGPFSML(cnlink->fi, LOGL_NOTICE, "link lost\n");
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llist_for_each_entry_safe(map, map2, &cnlink->map_list, hnbgw_cnlink_entry)
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context_map_cnlink_lost(map);
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}
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static void tx_reset(struct hnbgw_cnlink *cnlink)
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{
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struct msgb *msg;
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RANAP_Cause_t cause = {
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.present = RANAP_Cause_PR_transmissionNetwork,
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.choice. transmissionNetwork = RANAP_CauseTransmissionNetwork_signalling_transport_resource_failure,
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};
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RANAP_GlobalRNC_ID_t grnc_id;
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RANAP_GlobalRNC_ID_t *use_grnc_id = NULL;
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uint8_t plmn_buf[3];
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if (!cnlink)
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return;
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/* We need to have chosen an SCCP instance, and the remote SCCP address needs to be set.
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* Only check the remote_addr, allowing use.remote_addr_name to be NULL: if the user has not set an explicit
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* remote address book entry, auto-configuration may still have chosen a default remote point-code. */
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if (!cnlink->hnbgw_sccp_user
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|| !osmo_sccp_check_addr(&cnlink->remote_addr, OSMO_SCCP_ADDR_T_PC | OSMO_SCCP_ADDR_T_SSN)) {
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LOG_CNLINK(cnlink, DRANAP, LOGL_DEBUG, "not yet configured, not sending RANAP RESET\n");
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return;
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}
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LOG_CNLINK(cnlink, DRANAP, LOGL_DEBUG, "Tx RANAP RESET to %s %s\n",
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cnlink_is_cs(cnlink) ? "IuCS" : "IuPS",
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cnlink_sccp_addr_to_str(cnlink, &cnlink->remote_addr));
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if (g_hnbgw->config.plmn.mcc) {
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osmo_plmn_to_bcd(plmn_buf, &g_hnbgw->config.plmn);
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grnc_id = (RANAP_GlobalRNC_ID_t){
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.pLMNidentity = {
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.buf = plmn_buf,
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.size = 3,
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},
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.rNC_ID = g_hnbgw->config.rnc_id,
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};
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use_grnc_id = &grnc_id;
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} else {
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/* If no PLMN is configured, omit the Global RNC Id from the RESET message.
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*
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* According to 3GPP TS 25.413 8.26.2.2, "The RNC shall include the Global RNC-ID IE in the RESET
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* message", so it should be considered a mandatory IE when coming from us, the RNC.
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*
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* But osmo-hnbgw < v1.5 worked well with osmo-hnbgw.cfg files that have no PLMN configured, and we are
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* trying to stay backwards compatible for those users. Such a site should still work, but they should
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* now see these error logs and can adjust the config.
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*/
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LOG_CNLINK(cnlink, DRANAP, LOGL_ERROR,
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"No local PLMN is configured, so outgoing RESET messages omit the mandatory Global RNC-ID"
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" IE. You should set a 'hnbgw' / 'plmn' in your config file (since v1.5)\n");
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}
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msg = ranap_new_msg_reset2(cnlink->pool->domain, &cause, use_grnc_id);
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osmo_sccp_tx_unitdata_msg(cnlink->hnbgw_sccp_user->sccp_user,
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&cnlink->hnbgw_sccp_user->local_addr,
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&cnlink->remote_addr,
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msg);
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}
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static void tx_reset_ack(struct hnbgw_cnlink *cnlink)
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{
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struct msgb *msg;
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struct osmo_sccp_instance *sccp = cnlink_sccp(cnlink);
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if (!sccp) {
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LOG_CNLINK(cnlink, DRANAP, LOGL_ERROR, "cannot send RANAP RESET ACK: no CN link\n");
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return;
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}
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LOG_CNLINK(cnlink, DRANAP, LOGL_NOTICE, "Tx RANAP RESET ACK %s %s --> %s\n",
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cnlink_is_cs(cnlink) ? "IuCS" : "IuPS",
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cnlink_sccp_addr_to_str(cnlink, &cnlink->hnbgw_sccp_user->local_addr),
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cnlink_sccp_addr_to_str(cnlink, &cnlink->remote_addr));
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msg = ranap_new_msg_reset_ack(cnlink->pool->domain, NULL);
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osmo_sccp_tx_unitdata_msg(cnlink->hnbgw_sccp_user->sccp_user,
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&cnlink->hnbgw_sccp_user->local_addr,
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&cnlink->remote_addr,
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msg);
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}
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static void cnlink_disc_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state)
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{
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struct hnbgw_cnlink *cnlink = (struct hnbgw_cnlink *)fi->priv;
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if (prev_state == CNLINK_ST_CONN)
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link_lost(cnlink);
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}
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static void cnlink_disc_action(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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struct hnbgw_cnlink *cnlink = (struct hnbgw_cnlink *)fi->priv;
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switch (event) {
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case CNLINK_EV_RX_RESET:
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tx_reset_ack(cnlink);
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cnlink_fsm_state_chg(fi, CNLINK_ST_CONN);
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break;
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case CNLINK_EV_RX_RESET_ACK:
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cnlink_fsm_state_chg(fi, CNLINK_ST_CONN);
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break;
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default:
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OSMO_ASSERT(false);
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}
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}
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static void cnlink_conn_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state)
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{
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struct hnbgw_cnlink *cnlink = (struct hnbgw_cnlink *)fi->priv;
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if (prev_state != CNLINK_ST_CONN)
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link_up(cnlink);
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}
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static void cnlink_conn_action(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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struct hnbgw_cnlink *cnlink = (struct hnbgw_cnlink *)fi->priv;
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switch (event) {
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case CNLINK_EV_RX_RESET:
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/* We were connected, but the remote side has restarted. */
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link_lost(cnlink);
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tx_reset_ack(cnlink);
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link_up(cnlink);
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break;
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case CNLINK_EV_RX_RESET_ACK:
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LOGPFSML(fi, LOGL_INFO, "Link is already up, ignoring RESET ACK\n");
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break;
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default:
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OSMO_ASSERT(false);
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}
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}
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static int cnlink_fsm_timer_cb(struct osmo_fsm_inst *fi)
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{
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struct hnbgw_cnlink *cnlink = (struct hnbgw_cnlink *)fi->priv;
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tx_reset(cnlink);
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/* (re-)enter disconnect state to resend RESET after timeout. */
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cnlink_fsm_state_chg(fi, CNLINK_ST_DISC);
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/* Return 0 to not terminate the fsm */
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return 0;
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}
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#define S(x) (1 << (x))
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static struct osmo_fsm_state cnlink_fsm_states[] = {
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[CNLINK_ST_DISC] = {
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.name = "DISC",
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.in_event_mask = 0
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| S(CNLINK_EV_RX_RESET)
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| S(CNLINK_EV_RX_RESET_ACK)
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,
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.out_state_mask = 0
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| S(CNLINK_ST_DISC)
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| S(CNLINK_ST_CONN)
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,
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.onenter = cnlink_disc_onenter,
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.action = cnlink_disc_action,
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},
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[CNLINK_ST_CONN] = {
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.name = "CONN",
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.in_event_mask = 0
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| S(CNLINK_EV_RX_RESET)
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| S(CNLINK_EV_RX_RESET_ACK)
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,
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.out_state_mask = 0
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| S(CNLINK_ST_DISC)
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| S(CNLINK_ST_CONN)
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,
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.onenter = cnlink_conn_onenter,
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.action = cnlink_conn_action,
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},
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};
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static struct osmo_fsm cnlink_fsm = {
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.name = "cnlink",
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.states = cnlink_fsm_states,
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.num_states = ARRAY_SIZE(cnlink_fsm_states),
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.log_subsys = DRANAP,
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.timer_cb = cnlink_fsm_timer_cb,
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.event_names = cnlink_fsm_event_names,
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};
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bool cnlink_is_conn_ready(const struct hnbgw_cnlink *cnlink)
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{
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return cnlink->fi->state == CNLINK_ST_CONN;
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}
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void cnlink_resend_reset(struct hnbgw_cnlink *cnlink)
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{
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/* Immediately (1ms) kick off reset sending mechanism */
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osmo_fsm_inst_state_chg_ms(cnlink->fi, CNLINK_ST_DISC, 1, 0);
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}
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void cnlink_set_disconnected(struct hnbgw_cnlink *cnlink)
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{
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/* Go to disconnected state, with the normal RESET timeout to re-send RESET. */
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cnlink_fsm_state_chg(cnlink->fi, CNLINK_ST_DISC);
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}
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static __attribute__((constructor)) void cnlink_fsm_init(void)
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{
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OSMO_ASSERT(osmo_fsm_register(&cnlink_fsm) == 0);
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}
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void cnlink_rx_reset_cmd(struct hnbgw_cnlink *cnlink)
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{
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osmo_fsm_inst_dispatch(cnlink->fi, CNLINK_EV_RX_RESET, NULL);
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}
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void cnlink_rx_reset_ack(struct hnbgw_cnlink *cnlink)
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{
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osmo_fsm_inst_dispatch(cnlink->fi, CNLINK_EV_RX_RESET_ACK, NULL);
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}
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