diff options
Diffstat (limited to 'src/libcommon-cs')
| -rw-r--r-- | src/libcommon-cs/Makefile.am | 1 | ||||
| -rw-r--r-- | src/libcommon-cs/a_reset.c | 216 |
2 files changed, 0 insertions, 217 deletions
diff --git a/src/libcommon-cs/Makefile.am b/src/libcommon-cs/Makefile.am index 58fd52451..10608ab88 100644 --- a/src/libcommon-cs/Makefile.am +++ b/src/libcommon-cs/Makefile.am @@ -18,5 +18,4 @@ AM_CFLAGS = \ noinst_LIBRARIES = libcommon-cs.a libcommon_cs_a_SOURCES = \ - a_reset.c \ common_cs.c diff --git a/src/libcommon-cs/a_reset.c b/src/libcommon-cs/a_reset.c deleted file mode 100644 index 701066f34..000000000 --- a/src/libcommon-cs/a_reset.c +++ /dev/null @@ -1,216 +0,0 @@ -/* (C) 2017 by sysmocom s.f.m.c. GmbH - * All Rights Reserved - * - * Author: Philipp Maier - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU Affero General Public License as published by - * the Free Software Foundation; either version 3 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU Affero General Public License for more details. - * - * You should have received a copy of the GNU Affero General Public License - * along with this program. If not, see <http://www.gnu.org/licenses/>. - * - */ - -#include <osmocom/core/logging.h> -#include <osmocom/core/utils.h> -#include <osmocom/core/timer.h> -#include <osmocom/core/fsm.h> -#include <unistd.h> -#include <errno.h> -#include <string.h> -#include <osmocom/msc/debug.h> -#include <osmocom/msc/a_reset.h> - -#define RESET_RESEND_INTERVAL 2 /* sec */ -#define RESET_RESEND_TIMER_NO 1234 /* FIXME: dig out the real timer number */ -#define BAD_CONNECTION_THRESOLD 3 /* connection failures */ - -enum fsm_states { - ST_DISC, /* Disconnected from remote end */ - ST_CONN, /* We have a confirmed connection */ -}; - -enum fsm_evt { - EV_RESET_ACK, /* got reset acknowlegement from remote end */ - EV_N_DISCONNECT, /* lost a connection */ - EV_N_CONNECT, /* made a successful connection */ -}; - -static const struct value_string fsm_event_names[] = { - OSMO_VALUE_STRING(EV_RESET_ACK), - OSMO_VALUE_STRING(EV_N_DISCONNECT), - OSMO_VALUE_STRING(EV_N_CONNECT), - {0, NULL} -}; - -/* Disconnected state */ -static void fsm_disc_cb(struct osmo_fsm_inst *fi, uint32_t event, void *data) -{ - struct a_reset_ctx *reset = (struct a_reset_ctx *)data; - OSMO_ASSERT(reset); - OSMO_ASSERT(reset->fsm); - LOGPFSML(reset->fsm, LOGL_NOTICE, "SIGTRAN connection succeded.\n"); - - reset->conn_loss_counter = 0; - osmo_fsm_inst_state_chg(fi, ST_CONN, 0, 0); -} - -/* Connected state */ -static void fsm_conn_cb(struct osmo_fsm_inst *fi, uint32_t event, void *data) -{ - struct a_reset_ctx *reset = (struct a_reset_ctx *)data; - OSMO_ASSERT(reset); - - switch (event) { - case EV_N_DISCONNECT: - if (reset->conn_loss_counter >= BAD_CONNECTION_THRESOLD) { - LOGPFSML(reset->fsm, LOGL_NOTICE, "SIGTRAN connection down, reconnecting...\n"); - osmo_fsm_inst_state_chg(fi, ST_DISC, RESET_RESEND_INTERVAL, RESET_RESEND_TIMER_NO); - } else - reset->conn_loss_counter++; - break; - case EV_N_CONNECT: - reset->conn_loss_counter = 0; - break; - } -} - -/* Timer callback to retransmit the reset signal */ -static int fsm_reset_ack_timeout_cb(struct osmo_fsm_inst *fi) -{ - struct a_reset_ctx *reset = (struct a_reset_ctx *)fi->priv; - OSMO_ASSERT(reset->fsm); - - LOGPFSML(reset->fsm, LOGL_NOTICE, "(re)sending BSSMAP RESET message...\n"); - - reset->cb(reset->priv); - - osmo_fsm_inst_state_chg(fi, ST_DISC, RESET_RESEND_INTERVAL, RESET_RESEND_TIMER_NO); - return 0; -} - -static struct osmo_fsm_state fsm_states[] = { - [ST_DISC] = { - .in_event_mask = (1 << EV_RESET_ACK), - .out_state_mask = (1 << ST_DISC) | (1 << ST_CONN), - .name = "DISC", - .action = fsm_disc_cb, - }, - [ST_CONN] = { - .in_event_mask = (1 << EV_N_DISCONNECT) | (1 << EV_N_CONNECT), - .out_state_mask = (1 << ST_DISC) | (1 << ST_CONN), - .name = "CONN", - .action = fsm_conn_cb, - }, -}; - -/* State machine definition */ -static struct osmo_fsm fsm = { - .name = "A-RESET", - .states = fsm_states, - .num_states = ARRAY_SIZE(fsm_states), - .log_subsys = DMSC, - .timer_cb = fsm_reset_ack_timeout_cb, - .event_names = fsm_event_names, -}; - -/* Create and start state machine which handles the reset/reset-ack procedure */ -struct a_reset_ctx *a_reset_alloc(const void *ctx, const char *name, void *cb, void *priv, - bool already_connected) -{ - OSMO_ASSERT(name); - - struct a_reset_ctx *reset; - - /* Register the fsm description (if not already done) */ - if (osmo_fsm_find_by_name(fsm.name) != &fsm) - osmo_fsm_register(&fsm); - - /* Allocate and configure a new fsm instance */ - reset = talloc_zero(ctx, struct a_reset_ctx); - OSMO_ASSERT(reset); - reset->priv = priv; - reset->cb = cb; - reset->conn_loss_counter = 0; - reset->fsm = osmo_fsm_inst_alloc(&fsm, NULL, NULL, LOGL_DEBUG, name); - OSMO_ASSERT(reset->fsm); - reset->fsm->priv = reset; - - if (already_connected) - osmo_fsm_inst_state_chg(reset->fsm, ST_CONN, 0, 0); - else { - /* kick off reset-ack sending mechanism */ - osmo_fsm_inst_state_chg(reset->fsm, ST_DISC, RESET_RESEND_INTERVAL, - RESET_RESEND_TIMER_NO); - } - - return reset; -} - -/* Tear down state machine */ -void a_reset_free(struct a_reset_ctx *reset) -{ - OSMO_ASSERT(reset); - OSMO_ASSERT(reset->fsm); - - osmo_fsm_inst_free(reset->fsm); - reset->fsm = NULL; - - memset(reset, 0, sizeof(*reset)); - talloc_free(reset); -} - -/* Confirm that we sucessfully received a reset acknowlege message */ -void a_reset_ack_confirm(struct a_reset_ctx *reset) -{ - OSMO_ASSERT(reset); - OSMO_ASSERT(reset->fsm); - - osmo_fsm_inst_dispatch(reset->fsm, EV_RESET_ACK, reset); -} - -/* Report a failed connection */ -void a_reset_conn_fail(struct a_reset_ctx *reset) -{ - /* If no reset context is supplied, just drop the info */ - if (!reset) - return; - - OSMO_ASSERT(reset->fsm); - - osmo_fsm_inst_dispatch(reset->fsm, EV_N_DISCONNECT, reset); -} - -/* Report a successful connection */ -void a_reset_conn_success(struct a_reset_ctx *reset) -{ - /* If no reset context is supplied, just drop the info */ - if (!reset) - return; - - OSMO_ASSERT(reset->fsm); - - osmo_fsm_inst_dispatch(reset->fsm, EV_N_CONNECT, reset); -} - -/* Check if we have a connection to a specified msc */ -bool a_reset_conn_ready(struct a_reset_ctx *reset) -{ - /* If no reset context is supplied, we assume that - * the connection can't be ready! */ - if (!reset) - return false; - - OSMO_ASSERT(reset->fsm); - if (reset->fsm->state == ST_CONN) - return true; - - return false; -} |