forked from cellular-infrastructure/osmo-bsc-nat
Add bsc_nat fsm
Create the initial FSM that starts and stops two SS7 instances (one for CN, one for RAN), and binds an sccp user to each. Related: SYS#5560 Depends: libosmocore I81c64a7ae440304522c2179c212023a566ddced8 Change-Id: I7d52fa649c397582b18a1a7dcc40bb407f3b2c97
This commit is contained in:
parent
d9c34fdc44
commit
8f7b750b22
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@ -0,0 +1,15 @@
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cs7 instance 0
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point-code 0.23.3
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asp asp-clnt-OsmoBSCNAT-CN 2905 0 m3ua
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remote-ip 127.0.0.1
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local-ip 127.0.0.3
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cs7 instance 1
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point-code 0.23.1
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asp asp-clnt-OsmoBSCNAT-RAN 2905 0 m3ua
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remote-ip 127.0.0.2
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local-ip 127.0.0.4
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bsc-nat
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cs7-instance-cn 0
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cs7-instance-ran 1
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@ -1,5 +1,6 @@
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noinst_HEADERS = \
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bsc_nat.h \
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bsc_nat_fsm.h \
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logging.h \
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vty.h \
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$(NULL)
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@ -18,7 +18,21 @@
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*/
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#pragma once
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#include <osmocom/core/fsm.h>
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#include <osmocom/sigtran/sccp_sap.h>
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struct bsc_nat_ss7_inst {
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uint32_t ss7_id;
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struct osmo_sccp_addr local_sccp_addr;
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struct osmo_sccp_user *scu;
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};
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struct bsc_nat {
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struct osmo_fsm_inst *fi;
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struct bsc_nat_ss7_inst *cn;
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struct bsc_nat_ss7_inst *ran;
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};
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struct bsc_nat *bsc_nat_alloc(void *tall_ctx);
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@ -0,0 +1,23 @@
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/* (C) 2021 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
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* Author: Oliver Smith <osmith@sysmocom.de>
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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/lienses/>.
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*
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*/
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#pragma once
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void bsc_nat_fsm_alloc(struct bsc_nat *bsc_nat);
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void bsc_nat_fsm_start(struct bsc_nat *bsc_nat);
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void bsc_nat_fsm_stop(struct bsc_nat *bsc_nat);
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@ -26,6 +26,7 @@ bin_PROGRAMS = \
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osmo_bsc_nat_SOURCES = \
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bsc_nat.c \
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bsc_nat_fsm.c \
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logging.c \
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main.c \
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vty.c \
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@ -22,6 +22,7 @@
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#include <osmocom/core/talloc.h>
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#include <osmocom/core/utils.h>
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#include <osmocom/bsc_nat/bsc_nat.h>
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#include <osmocom/bsc_nat/bsc_nat_fsm.h>
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struct bsc_nat *bsc_nat_alloc(void *tall_ctx)
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{
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@ -30,10 +31,25 @@ struct bsc_nat *bsc_nat_alloc(void *tall_ctx)
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bsc_nat = talloc_zero(tall_ctx, struct bsc_nat);
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OSMO_ASSERT(bsc_nat);
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bsc_nat->cn = talloc_zero(bsc_nat, struct bsc_nat_ss7_inst);
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OSMO_ASSERT(bsc_nat->cn);
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talloc_set_name_const(bsc_nat->cn, "struct bsc_nat_ss7_inst (CN)");
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bsc_nat->ran = talloc_zero(bsc_nat, struct bsc_nat_ss7_inst);
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OSMO_ASSERT(bsc_nat->ran);
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talloc_set_name_const(bsc_nat->ran, "struct bsc_nat_ss7_inst (RAN)");
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bsc_nat_fsm_alloc(bsc_nat);
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return bsc_nat;
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}
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void bsc_nat_free(struct bsc_nat *bsc_nat)
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{
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if (bsc_nat->fi) {
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osmo_fsm_inst_free(bsc_nat->fi);
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bsc_nat->fi = NULL;
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}
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talloc_free(bsc_nat);
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}
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@ -0,0 +1,214 @@
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/* (C) 2021 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
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* Author: Oliver Smith <osmith@sysmocom.de>
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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/lienses/>.
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*
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*/
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#include "config.h"
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#include <errno.h>
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#include <stdint.h>
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#include <osmocom/core/fsm.h>
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#include <osmocom/core/select.h>
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#include <osmocom/sigtran/osmo_ss7.h>
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#include <osmocom/bsc_nat/bsc_nat.h>
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#include <osmocom/bsc_nat/bsc_nat_fsm.h>
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#include <osmocom/bsc_nat/logging.h>
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#define DEFAULT_PC_RAN "0.23.1" /* same as default for OsmoMSC */
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#define DEFAULT_PC_CN "0.23.3" /* same as default for OsmoBSC */
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#define X(s) (1 << (s))
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enum bsc_nat_fsm_states {
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BSC_NAT_FSM_ST_STOPPED,
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BSC_NAT_FSM_ST_STARTING,
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BSC_NAT_FSM_ST_STARTED,
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};
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enum bsc_nat_fsm_events {
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BSC_NAT_FSM_EV_START,
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BSC_NAT_FSM_EV_STOP,
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};
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static int sccp_sap_up(struct osmo_prim_hdr *oph, void *priv)
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{
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LOGP(DMAIN, LOGL_NOTICE, "STUB: sccp_sap_up() called\n");
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return 0;
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}
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static int ss7_inst_init(struct bsc_nat_ss7_inst *inst, const char *name, const char *default_pc_str,
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enum osmo_sccp_ssn ssn)
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{
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int default_pc;
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struct osmo_sccp_instance *sccp;
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default_pc = osmo_ss7_pointcode_parse(NULL, default_pc_str);
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OSMO_ASSERT(default_pc >= 0);
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sccp = osmo_sccp_simple_client_on_ss7_id(inst, inst->ss7_id, name, default_pc, OSMO_SS7_ASP_PROT_M3UA, 0, NULL,
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0, NULL);
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if (!sccp) {
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LOGP(DMAIN, LOGL_ERROR, "%s: failed to request sccp client instance for sccp user\n", name);
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return -1;
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}
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osmo_sccp_local_addr_by_instance(&inst->local_sccp_addr, sccp, ssn);
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inst->scu = osmo_sccp_user_bind(sccp, name, sccp_sap_up, ssn);
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if (!inst->scu) {
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LOGP(DMAIN, LOGL_ERROR, "%s: failed to bind sccp user\n", name);
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return -2;
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}
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osmo_sccp_user_set_priv(inst->scu, inst);
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return 0;
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}
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static void ss7_inst_free(struct bsc_nat_ss7_inst *inst)
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{
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if (inst->scu) {
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osmo_sccp_user_unbind(inst->scu);
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inst->scu = NULL;
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}
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struct osmo_ss7_instance *ss7 = osmo_ss7_instance_find(inst->ss7_id);
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if (ss7)
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osmo_ss7_instance_destroy(ss7);
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talloc_free(inst);
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}
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static void st_starting_on_enter(struct osmo_fsm_inst *fi, uint32_t prev_state)
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{
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struct bsc_nat *bsc_nat = (struct bsc_nat *)fi->priv;
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if (ss7_inst_init(bsc_nat->cn, "OsmoBSCNAT-CN", DEFAULT_PC_CN, OSMO_SCCP_SSN_RANAP) < 0) {
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osmo_fsm_inst_state_chg(fi, BSC_NAT_FSM_ST_STOPPED, 0, 0);
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return;
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}
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if (ss7_inst_init(bsc_nat->ran, "OsmoBSCNAT-RAN", DEFAULT_PC_RAN, OSMO_SCCP_SSN_MSC) < 0) {
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osmo_fsm_inst_state_chg(fi, BSC_NAT_FSM_ST_STOPPED, 0, 0);
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return;
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}
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osmo_fsm_inst_state_chg(fi, BSC_NAT_FSM_ST_STARTED, 0, 0);
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}
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static void st_started(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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switch (event) {
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case BSC_NAT_FSM_EV_STOP:
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osmo_fsm_inst_state_chg(fi, BSC_NAT_FSM_ST_STOPPED, 0, 0);
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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 st_stopped_on_enter(struct osmo_fsm_inst *fi, uint32_t prev_state)
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{
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struct bsc_nat *bsc_nat = (struct bsc_nat *)fi->priv;
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ss7_inst_free(bsc_nat->cn);
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bsc_nat->cn = NULL;
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ss7_inst_free(bsc_nat->ran);
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bsc_nat->ran = NULL;
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}
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static void st_stopped(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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switch (event) {
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case BSC_NAT_FSM_EV_START:
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osmo_fsm_inst_state_chg(fi, BSC_NAT_FSM_ST_STARTING, 0, 0);
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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 struct osmo_fsm_state bsc_nat_fsm_states[] = {
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[BSC_NAT_FSM_ST_STOPPED] = {
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.name = "STOPPED",
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.in_event_mask = 0
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| X(BSC_NAT_FSM_EV_START)
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,
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.out_state_mask = 0
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| X(BSC_NAT_FSM_ST_STARTING)
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,
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.action = st_stopped,
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.onenter = st_stopped_on_enter,
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},
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[BSC_NAT_FSM_ST_STARTING] = {
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.name = "STARTING",
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.out_state_mask = 0
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| X(BSC_NAT_FSM_ST_STARTED)
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| X(BSC_NAT_FSM_ST_STOPPED)
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,
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.onenter = st_starting_on_enter,
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},
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[BSC_NAT_FSM_ST_STARTED] = {
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.name = "STARTED",
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.in_event_mask = 0
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| X(BSC_NAT_FSM_EV_STOP)
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,
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.out_state_mask = 0
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| X(BSC_NAT_FSM_ST_STOPPED)
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,
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.action = st_started,
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},
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};
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const struct value_string bsc_nat_fsm_event_names[] = {
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OSMO_VALUE_STRING(BSC_NAT_FSM_EV_START),
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OSMO_VALUE_STRING(BSC_NAT_FSM_EV_STOP),
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{ 0, NULL }
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};
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struct osmo_fsm bsc_nat_fsm = {
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.name = "BSC_NAT",
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.states = bsc_nat_fsm_states,
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.num_states = ARRAY_SIZE(bsc_nat_fsm_states),
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.log_subsys = DMAIN,
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.event_names = bsc_nat_fsm_event_names,
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};
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static __attribute__((constructor)) void bsc_nat_fsm_init(void)
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{
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OSMO_ASSERT(osmo_fsm_register(&bsc_nat_fsm) == 0);
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}
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void bsc_nat_fsm_alloc(struct bsc_nat *bsc_nat)
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{
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bsc_nat->fi = osmo_fsm_inst_alloc(&bsc_nat_fsm, bsc_nat, bsc_nat, LOGL_INFO, NULL);
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OSMO_ASSERT(bsc_nat->fi);
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}
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void bsc_nat_fsm_start(struct bsc_nat *bsc_nat)
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{
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osmo_fsm_inst_dispatch(bsc_nat->fi, BSC_NAT_FSM_EV_START, NULL);
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}
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void bsc_nat_fsm_stop(struct bsc_nat *bsc_nat)
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{
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osmo_fsm_inst_dispatch(bsc_nat->fi, BSC_NAT_FSM_EV_STOP, NULL);
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}
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@ -22,6 +22,8 @@
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#include <getopt.h>
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#include <osmocom/core/application.h>
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#include <osmocom/sigtran/osmo_ss7.h>
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#include <osmocom/sigtran/sccp_sap.h>
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#include <osmocom/vty/cpu_sched_vty.h>
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#include <osmocom/vty/logging.h>
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#include <osmocom/vty/misc.h>
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@ -29,6 +31,7 @@
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#include <osmocom/vty/telnet_interface.h>
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#include <osmocom/bsc_nat/bsc_nat.h>
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#include <osmocom/bsc_nat/bsc_nat_fsm.h>
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#include <osmocom/bsc_nat/logging.h>
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#include <osmocom/bsc_nat/vty.h>
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@ -113,7 +116,10 @@ static void main_vty_init(int argc, char **argv)
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logging_vty_add_cmds();
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osmo_talloc_vty_add_cmds();
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osmo_fsm_vty_add_cmds();
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osmo_cpu_sched_vty_init(tall_bsc_nat_ctx);
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osmo_ss7_vty_init_asp(NULL);
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osmo_sccp_vty_init();
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handle_options(argc, argv);
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@ -185,14 +191,25 @@ int main(int argc, char **argv)
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if (rc < 0)
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exit(1);
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rc = osmo_ss7_init();
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if (rc < 0)
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exit(1);
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g_bsc_nat = bsc_nat_alloc(tall_bsc_nat_ctx);
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main_vty_init(argc, argv);
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signal_handler_init();
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bsc_nat_fsm_start(g_bsc_nat);
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while (!osmo_select_shutdown_done())
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osmo_select_main_ctx(0);
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bsc_nat_fsm_stop(g_bsc_nat);
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talloc_report_full(g_bsc_nat, stderr);
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bsc_nat_free(g_bsc_nat);
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log_fini();
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talloc_report_full(tall_bsc_nat_ctx, stderr);
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talloc_free(tall_bsc_nat_ctx);
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talloc_free(tall_vty_ctx);
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@ -68,12 +68,36 @@ DEFUN(cfg_bsc_nat,
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static int config_write_bsc_nat(struct vty *vty)
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{
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vty_out(vty, "bsc-nat%s", VTY_NEWLINE);
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vty_out(vty, " cs7-instance-cn %u%s", g_bsc_nat->cn->ss7_id, VTY_NEWLINE);
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vty_out(vty, " cs7-instance-ran %u%s", g_bsc_nat->ran->ss7_id, VTY_NEWLINE);
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return CMD_SUCCESS;
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}
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#define SS7_REF_STR "SS7 instance reference number\n"
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DEFUN(cfg_cs7_instance_cn,
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cfg_cs7_instance_cn_cmd,
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"cs7-instance-cn <0-15>",
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"Set SS7 to be used to connect to CN-side\n" SS7_REF_STR)
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{
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g_bsc_nat->cn->ss7_id = atoi(argv[0]);
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return CMD_SUCCESS;
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}
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DEFUN(cfg_cs7_instance_ran,
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cfg_cs7_instance_ran_cmd,
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"cs7-instance-ran <0-15>",
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"Set SS7 to be used to connect to RAN-side\n" SS7_REF_STR)
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{
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g_bsc_nat->ran->ss7_id = atoi(argv[0]);
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return CMD_SUCCESS;
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}
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void bsc_nat_vty_init(void)
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{
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install_element(CONFIG_NODE, &cfg_bsc_nat_cmd);
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install_node(&bsc_nat_node, config_write_bsc_nat);
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install_element(BSC_NAT_NODE, &cfg_cs7_instance_cn_cmd);
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install_element(BSC_NAT_NODE, &cfg_cs7_instance_ran_cmd);
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}
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