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smlc: Initial implementation of N-PCSTATE.ind

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Related: OS#5917
Change-Id: Id034a0c4d8bff0647a64658480dfa9b4cea563de
This commit is contained in:
Pau Espin Pedrol
2025-07-14 13:55:45 +02:00
parent 28748a57bb
commit 576b13fb19
3 changed files with 155 additions and 2 deletions
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5
include/osmocom/smlc/lb_peer.h
View File

@@ -1,5 +1,7 @@
#pragma once
#include <stdint.h>
#include <osmocom/core/linuxlist.h>
#include <osmocom/gsm/gsm0808.h>
#include <osmocom/sigtran/sccp_sap.h>
@@ -49,6 +51,8 @@ enum lb_peer_event {
LB_PEER_EV_MSG_DOWN_CO,
LB_PEER_EV_RX_RESET,
LB_PEER_EV_RX_RESET_ACK,
LB_PEER_EV_AVAILABLE,
LB_PEER_EV_UNAVAILABLE,
};
struct lb_peer_ev_ctx {
@@ -59,6 +63,7 @@ struct lb_peer_ev_ctx {
struct lb_peer *lb_peer_find_or_create(struct sccp_lb_inst *sli, const struct osmo_sccp_addr *peer_addr);
struct lb_peer *lb_peer_find(const struct sccp_lb_inst *sli, const struct osmo_sccp_addr *peer_addr);
struct lb_peer *lb_peer_find_by_pc(const struct sccp_lb_inst *sli, uint32_t pc);
int lb_peer_up_l2(struct sccp_lb_inst *sli, const struct osmo_sccp_addr *calling_addr, bool co, uint32_t conn_id,
struct msgb *l2);

47
src/osmo-smlc/lb_peer.c
View File

@@ -1,5 +1,5 @@
/*
* (C) 2019 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
* (C) 2019-2025 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
* All Rights Reserved
*
* SPDX-License-Identifier: AGPL-3.0+
@@ -80,6 +80,15 @@ struct lb_peer *lb_peer_find(const struct sccp_lb_inst *sli, const struct osmo_s
return NULL;
}
/* Find an lb_peer by its remote SCCP address */
struct lb_peer *lb_peer_find_by_pc(const struct sccp_lb_inst *sli, uint32_t pc)
{
struct osmo_sccp_addr rem_addr;
osmo_sccp_make_addr_pc_ssn(&rem_addr, pc, OSMO_SCCP_SSN_BSC_BSSAP_LE);
return lb_peer_find(sli, &rem_addr);
}
static const struct osmo_tdef_state_timeout lb_peer_fsm_timeouts[32] = {
[LB_PEER_ST_WAIT_RX_RESET_ACK] = { .T = -13 },
[LB_PEER_ST_DISCARDING] = { .T = -14 },
@@ -235,6 +244,15 @@ static void lb_peer_st_wait_rx_reset(struct osmo_fsm_inst *fi, uint32_t event, v
lb_peer_rx_reset(lbp, msg);
return;
case LB_PEER_EV_AVAILABLE:
/* Send a RESET to the peer. */
lb_peer_reset(lbp);
return;
case LB_PEER_EV_UNAVAILABLE:
/* Do nothing, wait for peer to come up again. */
return;
default:
LOG_LB_PEER(lbp, LOGL_ERROR, "Unhandled event: %s\n", osmo_fsm_event_name(&lb_peer_fsm, event));
return;
@@ -270,6 +288,15 @@ static void lb_peer_st_wait_rx_reset_ack(struct osmo_fsm_inst *fi, uint32_t even
lb_peer_rx_reset(lbp, msg);
return;
case LB_PEER_EV_AVAILABLE:
/* Send a RESET to the peer. */
lb_peer_reset(lbp);
return;
case LB_PEER_EV_UNAVAILABLE:
lb_peer_state_chg(lbp, LB_PEER_ST_WAIT_RX_RESET);
return;
default:
LOG_LB_PEER(lbp, LOGL_ERROR, "Unhandled event: %s\n", osmo_fsm_event_name(&lb_peer_fsm, event));
return;
@@ -334,6 +361,16 @@ static void lb_peer_st_ready(struct osmo_fsm_inst *fi, uint32_t event, void *dat
lb_peer_rx_reset(lbp, msg);
return;
case LB_PEER_EV_AVAILABLE:
/* Send a RESET to the peer. */
lb_peer_reset(lbp);
return;
case LB_PEER_EV_UNAVAILABLE:
lb_peer_discard_all_conns(lbp);
lb_peer_state_chg(lbp, LB_PEER_ST_WAIT_RX_RESET);
return;
default:
LOG_LB_PEER(lbp, LOGL_ERROR, "Unhandled event: %s\n", osmo_fsm_event_name(&lb_peer_fsm, event));
return;
@@ -363,6 +400,8 @@ static const struct value_string lb_peer_fsm_event_names[] = {
OSMO_VALUE_STRING(LB_PEER_EV_MSG_DOWN_CO),
OSMO_VALUE_STRING(LB_PEER_EV_RX_RESET),
OSMO_VALUE_STRING(LB_PEER_EV_RX_RESET_ACK),
OSMO_VALUE_STRING(LB_PEER_EV_AVAILABLE),
OSMO_VALUE_STRING(LB_PEER_EV_UNAVAILABLE),
{}
};
@@ -376,6 +415,8 @@ static const struct osmo_fsm_state lb_peer_fsm_states[] = {
| S(LB_PEER_EV_RX_RESET)
| S(LB_PEER_EV_MSG_UP_CO_INITIAL)
| S(LB_PEER_EV_MSG_UP_CO)
| S(LB_PEER_EV_AVAILABLE)
| S(LB_PEER_EV_UNAVAILABLE)
,
.out_state_mask = 0
| S(LB_PEER_ST_WAIT_RX_RESET)
@@ -392,6 +433,8 @@ static const struct osmo_fsm_state lb_peer_fsm_states[] = {
| S(LB_PEER_EV_RX_RESET_ACK)
| S(LB_PEER_EV_MSG_UP_CO_INITIAL)
| S(LB_PEER_EV_MSG_UP_CO)
| S(LB_PEER_EV_AVAILABLE)
| S(LB_PEER_EV_UNAVAILABLE)
,
.out_state_mask = 0
| S(LB_PEER_ST_WAIT_RX_RESET)
@@ -410,6 +453,8 @@ static const struct osmo_fsm_state lb_peer_fsm_states[] = {
| S(LB_PEER_EV_MSG_DOWN_CO_INITIAL)
| S(LB_PEER_EV_MSG_DOWN_CO)
| S(LB_PEER_EV_MSG_DOWN_CL)
| S(LB_PEER_EV_AVAILABLE)
| S(LB_PEER_EV_UNAVAILABLE)
,
.out_state_mask = 0
| S(LB_PEER_ST_WAIT_RX_RESET)

105
src/osmo-smlc/sccp_lb_inst.c
View File

@@ -1,5 +1,5 @@
/*
* (C) 2020 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
* (C) 2020-2025 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
* All Rights Reserved
*
* SPDX-License-Identifier: AGPL-3.0+
@@ -85,6 +85,96 @@ struct sccp_lb_inst *sccp_lb_init(void *talloc_ctx, struct osmo_sccp_instance *s
return sli;
}
static void handle_pcstate_ind(struct sccp_lb_inst *sli, const struct osmo_scu_pcstate_param *pcst)
{
struct osmo_ss7_instance *cs7 = osmo_sccp_get_ss7(sli->sccp);
struct lb_peer *lbp;
bool connected;
bool disconnected;
LOG_SCCP_LB(sli, LOGL_DEBUG, "N-PCSTATE ind: affected_pc=%u=%s sp_status=%s remote_sccp_status=%s\n",
pcst->affected_pc, osmo_ss7_pointcode_print(cs7, pcst->affected_pc),
osmo_sccp_sp_status_name(pcst->sp_status),
osmo_sccp_rem_sccp_status_name(pcst->remote_sccp_status));
/* If we don't care about that point-code, ignore PCSTATE. */
lbp = lb_peer_find_by_pc(sli, pcst->affected_pc);
if (!lbp) {
LOG_SCCP_LB(sli, LOGL_DEBUG, "No lb_peer found under pc=%u=%s\n",
pcst->affected_pc, osmo_ss7_pointcode_print(cs7, pcst->affected_pc));
return;
}
/* See if this marks the point code to have become available, or to have been lost.
*
* I want to detect two events:
* - connection event (both indicators say PC is reachable).
* - disconnection event (at least one indicator says the PC is not reachable).
*
* There are two separate incoming indicators with various possible values -- the incoming events can be:
*
* - neither connection nor disconnection indicated -- just indicating congestion
* connected == false, disconnected == false --> do nothing.
* - both incoming values indicate that we are connected
* --> trigger connected
* - both indicate we are disconnected
* --> trigger disconnected
* - one value indicates 'connected', the other indicates 'disconnected'
* --> trigger disconnected
*
* Congestion could imply that we're connected, but it does not indicate that a PC's reachability changed, so no need to
* trigger on that.
*/
connected = false;
disconnected = false;
switch (pcst->sp_status) {
case OSMO_SCCP_SP_S_ACCESSIBLE:
connected = true;
break;
case OSMO_SCCP_SP_S_INACCESSIBLE:
disconnected = true;
break;
default:
case OSMO_SCCP_SP_S_CONGESTED:
/* Neither connecting nor disconnecting */
break;
}
switch (pcst->remote_sccp_status) {
case OSMO_SCCP_REM_SCCP_S_AVAILABLE:
if (!disconnected)
connected = true;
break;
case OSMO_SCCP_REM_SCCP_S_UNAVAILABLE_UNKNOWN:
case OSMO_SCCP_REM_SCCP_S_UNEQUIPPED:
case OSMO_SCCP_REM_SCCP_S_INACCESSIBLE:
disconnected = true;
connected = false;
break;
default:
case OSMO_SCCP_REM_SCCP_S_CONGESTED:
/* Neither connecting nor disconnecting */
break;
}
if (disconnected) {
LOG_SCCP_LB(sli, LOGL_NOTICE,
"now unreachable: N-PCSTATE ind: pc=%u=%s sp_status=%s remote_sccp_status=%s\n",
pcst->affected_pc, osmo_ss7_pointcode_print(cs7, pcst->affected_pc),
osmo_sccp_sp_status_name(pcst->sp_status),
osmo_sccp_rem_sccp_status_name(pcst->remote_sccp_status));
osmo_fsm_inst_dispatch(lbp->fi, LB_PEER_EV_UNAVAILABLE, NULL);
} else if (connected) {
LOG_SCCP_LB(sli, LOGL_NOTICE,
"now available: N-PCSTATE ind: pc=%u=%s sp_status=%s remote_sccp_status=%s\n",
pcst->affected_pc, osmo_ss7_pointcode_print(cs7, pcst->affected_pc),
osmo_sccp_sp_status_name(pcst->sp_status),
osmo_sccp_rem_sccp_status_name(pcst->remote_sccp_status));
osmo_fsm_inst_dispatch(lbp->fi, LB_PEER_EV_AVAILABLE, NULL);
}
}
static int sccp_lb_sap_up(struct osmo_prim_hdr *oph, void *_scu)
{
struct osmo_sccp_user *scu = _scu;
@@ -163,6 +253,19 @@ static int sccp_lb_sap_up(struct osmo_prim_hdr *oph, void *_scu)
rc = lb_peer_up_l2(sli, peer_addr, false, 0, oph->msg);
break;
case OSMO_PRIM(OSMO_SCU_PRIM_N_PCSTATE, PRIM_OP_INDICATION):
handle_pcstate_ind(sli, &prim->u.pcstate);
rc = 0;
break;
case OSMO_PRIM(OSMO_SCU_PRIM_N_STATE, PRIM_OP_INDICATION):
LOG_SCCP_LB(sli, LOGL_INFO,
"SCCP-User-SAP: Ignoring %s.%s\n",
osmo_scu_prim_type_name(oph->primitive),
get_value_string(osmo_prim_op_names, oph->operation));
rc = 0;
break;
default:
LOG_SCCP_LB_CL(sli, NULL, LOGL_ERROR, "%s(%s) unsupported\n", __func__, osmo_scu_prim_name(oph));
rc = -1;