Neels Hofmeyr has uploaded this change for review. ( 
https://gerrit.osmocom.org/9670


Change subject: add gsm_timers, for Tnnn definitions usable by FSMs
......................................................................

add gsm_timers, for Tnnn definitions usable by FSMs

This reverts commit c0990acd03807631fb426ca0123d9fc402e97ca1.

Change-Id: If212fcd042051b6fa53484254223614c5b93a9c6
---
M include/osmocom/bsc/Makefile.am
M include/osmocom/bsc/gsm_data.h
A include/osmocom/bsc/gsm_timers.h
M src/ipaccess/Makefile.am
M src/osmo-bsc/Makefile.am
M src/osmo-bsc/abis_om2000.c
M src/osmo-bsc/abis_rsl.c
M src/osmo-bsc/bsc_subscr_conn_fsm.c
M src/osmo-bsc/bsc_vty.c
M src/osmo-bsc/bts_ipaccess_nanobts_omlattr.c
M src/osmo-bsc/bts_siemens_bs11.c
M src/osmo-bsc/gsm_data.c
A src/osmo-bsc/gsm_timers.c
A src/osmo-bsc/gsm_timers_vty.c
M src/osmo-bsc/net_init.c
M src/osmo-bsc/paging.c
M src/utils/Makefile.am
M tests/abis/Makefile.am
M tests/bsc/Makefile.am
M tests/gsm0408/Makefile.am
M tests/handover/Makefile.am
M tests/nanobts_omlattr/Makefile.am
M tests/nanobts_omlattr/nanobts_omlattr_test.c
23 files changed, 513 insertions(+), 180 deletions(-)



  git pull ssh://gerrit.osmocom.org:29418/osmo-bsc refs/changes/70/9670/1

diff --git a/include/osmocom/bsc/Makefile.am b/include/osmocom/bsc/Makefile.am
index 18737a3..82a2e26 100644
--- a/include/osmocom/bsc/Makefile.am
+++ b/include/osmocom/bsc/Makefile.am
@@ -18,6 +18,7 @@
        gsm_04_08_utils.h \
        gsm_04_80.h \
        gsm_data.h \
+       gsm_timers.h \
        handover.h \
        handover_cfg.h \
        handover_decision.h \
diff --git a/include/osmocom/bsc/gsm_data.h b/include/osmocom/bsc/gsm_data.h
index 6ee95f7..ce7a8fe 100644
--- a/include/osmocom/bsc/gsm_data.h
+++ b/include/osmocom/bsc/gsm_data.h
@@ -32,6 +32,8 @@
 #include <osmocom/bsc/bsc_msg_filter.h>
 #include <osmocom/bsc/acc_ramp.h>

+#define GSM_T3122_DEFAULT 10
+
 struct mgcp_client_conf;
 struct mgcp_client;
 struct mgcp_ctx;
@@ -1189,23 +1191,6 @@
        bsc_ctr_description,
 };

-#define GSM_T3101_DEFAULT 3    /* s */
-#define GSM_T3103_DEFAULT 5    /* s */
-#define GSM_T3105_DEFAULT 100  /* ms */
-#define GSM_T3107_DEFAULT 5    /* s */
-#define GSM_T3109_DEFAULT 5    /* s, must be 2s + radio_link_timeout*0.48 */
-#define GSM_T3111_DEFAULT 2    /* s */
-#define GSM_T3113_DEFAULT 10   /* s */
-#define GSM_T3115_DEFAULT 10
-#define GSM_T3117_DEFAULT 10
-#define GSM_T3119_DEFAULT 10
-#define GSM_T3122_DEFAULT 10
-#define GSM_T3141_DEFAULT 10
-#define GSM_T10_DEFAULT 6      /* RR Assignment timeout, in seconds */
-#define GSM_T7_DEFAULT 10      /* inter-BSC MO Handover first timeout, in 
seconds */
-#define GSM_T8_DEFAULT 10      /* inter-BSC MO Handover second timeout, in 
seconds */
-#define GSM_T101_DEFAULT 10    /* inter-BSC MT Handover timeout, in seconds */
-
 struct gsm_tz {
        int override; /* if 0, use system's time zone instead. */
        int hr; /* hour */
@@ -1237,23 +1222,8 @@
        unsigned int num_bts;
        struct llist_head bts_list;

-       /* timer values */
-       int T3101;
-       int T3103; /*< Handover timeout */
-       int T3105;
-       int T3107;
-       int T3109;
-       int T3111;
-       int T3113;
-       int T3115;
-       int T3117;
-       int T3119;
-       int T3122;
-       int T3141;
-       int T10; /*< RR Assignment timeout, in seconds */
-       int T7; /*< inter-BSC handover MO timeout from Handover Required to 
Handover Command */
-       int T8; /*< inter-BSC handover MO timeout from Handover Command to 
final Clear*/
-       int T101; /*< inter-BSC handover MT timeout from Handover Request to 
Handover Accept */
+       /* shall reference gsm_network_T[] */
+       struct T_def *T_defs;

        enum gsm_chan_t ctype_by_chreq[_NUM_CHREQ_T];

@@ -1287,9 +1257,6 @@
         * pointer is NULL to indicate absence of a bsc_subscribers list. */
        struct llist_head *bsc_subscribers;

-       /* Periodic location update default value */
-       uint8_t t3212;
-
        /* Timer for periodic channel load measurements to maintain each BTS's 
T3122. */
        struct osmo_timer_list t3122_chan_load_timer;

diff --git a/include/osmocom/bsc/gsm_timers.h b/include/osmocom/bsc/gsm_timers.h
new file mode 100644
index 0000000..fde8c93
--- /dev/null
+++ b/include/osmocom/bsc/gsm_timers.h
@@ -0,0 +1,55 @@
+/* API to define Tnnn timers globally, configure in VTY and use for FSM state 
changes. */
+#pragma once
+
+#include <stdint.h>
+#include <osmocom/core/utils.h>
+
+struct osmo_fsm_inst;
+struct vty;
+
+enum T_unit {
+       T_S = 0,        /*< most T are in seconds, keep 0 as default. */
+       T_MS,           /*< milliseconds */
+       T_M,            /*< minutes */
+       T_CUSTOM,
+};
+
+extern const struct value_string T_unit_names[];
+static inline const char *T_unit_name(enum T_unit val)
+{ return get_value_string(T_unit_names, val); }
+
+/* Define a GSM timer of the form Tnnn, with unit, default value and doc 
string. */
+struct T_def {
+       const int T; /*< T1234 number */
+       const int default_val; /*< timeout duration (according to unit), 
default value. */
+       const enum T_unit unit;
+       const char *desc;
+       int val; /*< currently active value, e.g. set by user config. */
+};
+
+/* Iterate an array of struct T_def, the last item should be fully zero, i.e. 
"{}" */
+#define for_each_T_def(d, T_defs) \
+       for (d = T_defs; d && (d->T || d->default_val || d->desc); d++)
+
+int T_def_get(struct T_def *T_defs, int T, enum T_unit as_unit, int 
val_if_not_present);
+void T_defs_reset(struct T_def *T_defs);
+struct T_def *T_def_get_entry(struct T_def *T_defs, int T);
+
+void T_defs_vty_init(struct T_def *T_defs, int cfg_parent_node);
+void T_defs_vty_write(struct vty *vty, const char *indent);
+
+
+struct state_timeout {
+       int T;
+       bool keep_timer;
+};
+
+struct state_timeout *get_state_timeout(uint32_t state, struct state_timeout 
*timeouts_array);
+
+#define fsm_inst_state_chg_T(fi, state, timeouts_array, T_defs, 
default_timeout) \
+       _fsm_inst_state_chg_T(fi, state, timeouts_array, T_defs, 
default_timeout, \
+                             __FILE__, __LINE__)
+int _fsm_inst_state_chg_T(struct osmo_fsm_inst *fi, uint32_t state,
+                         struct state_timeout *timeouts_array,
+                         struct T_def *T_defs, int default_timeout,
+                         const char *file, int line);
diff --git a/src/ipaccess/Makefile.am b/src/ipaccess/Makefile.am
index 2c6282d..ec3e027 100644
--- a/src/ipaccess/Makefile.am
+++ b/src/ipaccess/Makefile.am
@@ -55,6 +55,7 @@
        $(top_builddir)/src/osmo-bsc/bts_ipaccess_nanobts_omlattr.o \
        $(top_builddir)/src/osmo-bsc/gsm_data.o \
        $(top_builddir)/src/osmo-bsc/net_init.o \
+       $(top_builddir)/src/osmo-bsc/gsm_timers.o \
        $(OSMO_LIBS) \
        $(NULL)

@@ -65,5 +66,6 @@
        $(NULL)

 ipaccess_proxy_LDADD = \
+       $(top_builddir)/src/osmo-bsc/gsm_timers.o \
        $(OSMO_LIBS) \
        $(NULL)
diff --git a/src/osmo-bsc/Makefile.am b/src/osmo-bsc/Makefile.am
index afae0b6..86d943f 100644
--- a/src/osmo-bsc/Makefile.am
+++ b/src/osmo-bsc/Makefile.am
@@ -57,6 +57,8 @@
        gsm_04_08_utils.c \
        gsm_04_80_utils.c \
        gsm_data.c \
+       gsm_timers.c \
+       gsm_timers_vty.c \
        handover_cfg.c \
        handover_decision.c \
        handover_decision_2.c \
diff --git a/src/osmo-bsc/abis_om2000.c b/src/osmo-bsc/abis_om2000.c
index d533ea1..2934590 100644
--- a/src/osmo-bsc/abis_om2000.c
+++ b/src/osmo-bsc/abis_om2000.c
@@ -42,6 +42,7 @@
 #include <osmocom/bsc/abis_rsl.h>
 #include <osmocom/bsc/abis_om2000.h>
 #include <osmocom/bsc/signal.h>
+#include <osmocom/bsc/gsm_timers.h>
 #include <osmocom/abis/e1_input.h>

 /* FIXME: move to libosmocore */
@@ -1382,7 +1383,8 @@
                msgb_tv_put(msg, OM2K_DEI_CCCH_OPTIONS, 0x01);
                break;
        case GSM_PCHAN_CCCH_SDCCH4:
-               msgb_tv_put(msg, OM2K_DEI_T3105, ts->trx->bts->network->T3105 / 
10);
+               msgb_tv_put(msg, OM2K_DEI_T3105,
+                           T_def_get(ts->trx->bts->network->T_defs, 3105, 
T_MS, -1) / 10);
                msgb_tv_put(msg, OM2K_DEI_NY1, 35);
                msgb_tv_put(msg, OM2K_DEI_BA_PA_MFRMS, 0x06);
                msgb_tv_put(msg, OM2K_DEI_CBCH_INDICATOR, 0);
@@ -1396,7 +1398,8 @@
                                  sizeof(icm_bound_params), icm_bound_params);
                break;
        case GSM_PCHAN_SDCCH8_SACCH8C:
-               msgb_tv_put(msg, OM2K_DEI_T3105, ts->trx->bts->network->T3105 / 
10);
+               msgb_tv_put(msg, OM2K_DEI_T3105,
+                           T_def_get(ts->trx->bts->network->T_defs, 3105, 
T_MS, -1) / 10);
                msgb_tv_put(msg, OM2K_DEI_NY1, 35);
                msgb_tv_put(msg, OM2K_DEI_CBCH_INDICATOR, 0);
                msgb_tv_put(msg, OM2K_DEI_TSC, gsm_ts_tsc(ts));
@@ -1406,7 +1409,8 @@
                                  sizeof(icm_bound_params), icm_bound_params);
                break;
        default:
-               msgb_tv_put(msg, OM2K_DEI_T3105, ts->trx->bts->network->T3105 / 
10);
+               msgb_tv_put(msg, OM2K_DEI_T3105,
+                           T_def_get(ts->trx->bts->network->T_defs, 3105, 
T_MS, -1) / 10);
                msgb_tv_put(msg, OM2K_DEI_NY1, 35);
                msgb_tv_put(msg, OM2K_DEI_TSC, gsm_ts_tsc(ts));
                /* Disable RF RESOURCE INDICATION on idle channels */
diff --git a/src/osmo-bsc/abis_rsl.c b/src/osmo-bsc/abis_rsl.c
index b6741a8..756a689 100644
--- a/src/osmo-bsc/abis_rsl.c
+++ b/src/osmo-bsc/abis_rsl.c
@@ -46,6 +46,7 @@
 #include <osmocom/bsc/pcu_if.h>
 #include <osmocom/bsc/bsc_api.h>
 #include <osmocom/bsc/bsc_subscr_conn_fsm.h>
+#include <osmocom/bsc/gsm_timers.h>

 #define RSL_ALLOC_SIZE         1024
 #define RSL_ALLOC_HEADROOM     128
@@ -81,7 +82,9 @@
        if (lchan->state == LCHAN_S_REL_ERR) {
                osmo_timer_setup(&lchan->error_timer, error_timeout_cb, lchan);
                osmo_timer_schedule(&lchan->error_timer,
-                                  lchan->ts->trx->bts->network->T3111 + 2, 0);
+                                   
T_def_get(lchan->ts->trx->bts->network->T_defs,
+                                             993111, T_S, -1),
+                                   0);
        } else {
                rsl_lchan_set_state(lchan, LCHAN_S_NONE);
        }
@@ -1915,11 +1918,10 @@
                LOGP(DRSL, LOGL_NOTICE, "(bts=%d) CHAN RQD: no resources for %s 
0x%x\n",
                     msg->lchan->ts->trx->bts->nr, gsm_lchant_name(lctype), 
rqd_ref->ra);
                rate_ctr_inc(&bts->bts_ctrs->ctr[BTS_CTR_CHREQ_NO_CHANNEL]);
-               if (bts->T3122)
-                       wait_ind = bts->T3122;
-               else if (bts->network->T3122)
-                       wait_ind = bts->network->T3122 & 0xff;
-               else
+               wait_ind = bts->T3122;
+               if (!wait_ind)
+                       wait_ind = T_def_get(bts->network->T_defs, 3122, T_S, 
-1);
+               if (!wait_ind)
                        wait_ind = GSM_T3122_DEFAULT;
                /* The BTS will gather multiple CHAN RQD and reject up to 4 MS 
at the same time. */
                rsl_send_imm_ass_rej(bts, rqd_ref, wait_ind);
@@ -2001,7 +2003,7 @@

        /* Start timer T3101 to wait for GSM48_MT_RR_PAG_RESP */
        osmo_timer_setup(&lchan->T3101, t3101_expired, lchan);
-       osmo_timer_schedule(&lchan->T3101, bts->network->T3101, 0);
+       osmo_timer_schedule(&lchan->T3101, T_def_get(bts->network->T_defs, 
3101, T_S, -1), 0);

        /* send IMMEDIATE ASSIGN CMD on RSL to BTS (to send on CCCH to MS) */
        return rsl_imm_assign_cmd(bts, sizeof(*ia)+ia->mob_alloc_len, (uint8_t 
*) ia);
@@ -2161,7 +2163,7 @@
        osmo_timer_del(&lchan->T3109);
        osmo_timer_setup(&lchan->T3111, t3111_expired, lchan);
        bts = lchan->ts->trx->bts;
-       osmo_timer_schedule(&lchan->T3111, bts->network->T3111, 0);
+       osmo_timer_schedule(&lchan->T3111, T_def_get(bts->network->T_defs, 
3111, T_S, -1), 0);
 }

 /*     ESTABLISH INDICATION, LOCATION AREA UPDATE REQUEST
@@ -3000,7 +3002,7 @@
        struct gsm_bts *bts = lchan->ts->trx->bts;

        osmo_timer_setup(&lchan->T3109, t3109_expired, lchan);
-       osmo_timer_schedule(&lchan->T3109, bts->network->T3109, 0);
+       osmo_timer_schedule(&lchan->T3109, T_def_get(bts->network->T_defs, 
3109, T_S, -1), 0);
        return 0;
 }

diff --git a/src/osmo-bsc/bsc_subscr_conn_fsm.c 
b/src/osmo-bsc/bsc_subscr_conn_fsm.c
index e8fb6ed..6a97ce5 100644
--- a/src/osmo-bsc/bsc_subscr_conn_fsm.c
+++ b/src/osmo-bsc/bsc_subscr_conn_fsm.c
@@ -36,6 +36,7 @@
 #include <osmocom/bsc/penalty_timers.h>
 #include <osmocom/bsc/bsc_rll.h>
 #include <osmocom/bsc/abis_rsl.h>
+#include <osmocom/bsc/gsm_timers.h>
 #include <osmocom/mgcp_client/mgcp_client_fsm.h>
 #include <osmocom/core/byteswap.h>

@@ -122,6 +123,25 @@
        {0, NULL}
 };

+struct state_timeout conn_fsm_timeouts[32] = {
+       [ST_WAIT_ASS_CMPL] = { .T = 10 },
+       [ST_WAIT_CRCX_BTS] = { .T = 992427 },
+       [ST_WAIT_MDCX_BTS] = { .T = 992427 },
+       [ST_WAIT_CRCX_MSC] = { .T = 992427 },
+       [ST_WAIT_MDCX_BTS_HO] = { .T = 992427 },
+       [ST_WAIT_CC] = { .T = 993210 },
+       [ST_CLEARING] = { .T = 999 },
+};
+
+/* Transition to a state, using the T timer defined in conn_fsm_timeouts.
+ * The actual timeout value is in turn obtained from network->T_defs.
+ * Assumes local variable fi exists. */
+#define conn_fsm_state_chg(state) \
+       fsm_inst_state_chg_T(conn->fi, state, \
+                            conn_fsm_timeouts, \
+                            conn->network->T_defs, \
+                            -1)
+
 /* forward MT DTAP from BSSAP side to RSL side */
 static inline void submit_dtap(struct gsm_subscriber_connection *conn, struct 
msgb *msg,
                               struct osmo_fsm_inst *fi)
@@ -299,7 +319,7 @@
                } else {
                        /* SCCP T(conn est) is 1-2 minutes, way too long. The 
MS will timeout
                         * using T3210 (20s), T3220 (5s) or T3230 (10s) */
-                       osmo_fsm_inst_state_chg(fi, ST_WAIT_CC, 20, 993210);
+                       conn_fsm_state_chg(ST_WAIT_CC);
                }
                break;
        case GSCON_EV_A_CONN_IND:
@@ -328,11 +348,12 @@
 /* We've sent the CONNECTION.req to the SCCP provider and are waiting for CC 
from MSC */
 static void gscon_fsm_wait_cc(struct osmo_fsm_inst *fi, uint32_t event, void 
*data)
 {
+       struct gsm_subscriber_connection *conn = fi->priv;
        switch (event) {
        case GSCON_EV_A_CONN_CFM:
                /* MSC has confirmed the connection, we now change into the
                 * active state and wait there for further operations */
-               osmo_fsm_inst_state_chg(fi, ST_ACTIVE, 0, 0);
+               conn_fsm_state_chg(ST_ACTIVE);
                /* if there's user payload, forward it just like EV_MT_DTAP */
                /* FIXME: Question: if there's user payload attached to the CC, 
forward it like EV_MT_DTAP? */
                break;
@@ -374,7 +395,7 @@
        resp = gsm0808_create_assignment_failure(cause, NULL);
        sigtran_send(conn, resp, fi);
        if (fi->state != ST_ACTIVE)
-               osmo_fsm_inst_state_chg(fi, ST_ACTIVE, 0, 0);
+               conn_fsm_state_chg(ST_ACTIVE);
 }
 
 /* We're on an active subscriber connection, passing DTAP back and forth */
@@ -410,7 +431,7 @@
                        osmo_strlcpy(conn_peer.endpoint, get_mgw_ep_name(conn), 
sizeof(conn_peer.endpoint));

                        /* (Pre)Change state and create the connection */
-                       osmo_fsm_inst_state_chg(fi, ST_WAIT_CRCX_BTS, 
MGCP_MGW_TIMEOUT, MGCP_MGW_TIMEOUT_TIMER_NR);
+                       conn_fsm_state_chg(ST_WAIT_CRCX_BTS);
                        conn->user_plane.fi_bts =
                            mgcp_conn_create(conn->network->mgw.client, fi, 
GSCON_EV_MGW_FAIL_BTS,
                                             GSCON_EV_MGW_CRCX_RESP_BTS, 
&conn_peer);
@@ -437,7 +458,7 @@
                                return;
                        }

-                       osmo_fsm_inst_state_chg(fi, ST_WAIT_ASS_CMPL, 
conn->network->T10, 10);
+                       conn_fsm_state_chg(ST_WAIT_ASS_CMPL);
                        break;
                default:
                        /* An unsupported channel is requested, so we have to
@@ -457,7 +478,7 @@
                if (rc) {
                        resp = 
gsm0808_create_clear_rqst(GSM0808_CAUSE_EQUIPMENT_FAILURE);
                        sigtran_send(conn, resp, fi);
-                       osmo_fsm_inst_state_chg(fi, ST_CLEARING, 0, 0);
+                       conn_fsm_state_chg(ST_CLEARING);
                        return;
                }

@@ -466,7 +487,7 @@
                 * handover time out, so we do not need another timeout
                 * here (maybe its worth to think about giving GSCON
                 * more power over the actual handover process). */
-               osmo_fsm_inst_state_chg(fi, ST_WAIT_HO_COMPL, 0, 0);
+               conn_fsm_state_chg(ST_WAIT_HO_COMPL);
                break;
        case GSCON_EV_A_HO_REQ:
                /* FIXME: reject any handover requests with HO FAIL until 
implemented */
@@ -524,7 +545,7 @@
                        return;
                }

-               osmo_fsm_inst_state_chg(fi, ST_WAIT_ASS_CMPL, 
conn->network->T10, 10);
+               conn_fsm_state_chg(ST_WAIT_ASS_CMPL);
                break;
        case GSCON_EV_MO_DTAP:
                forward_dtap(conn, (struct msgb *)data, fi);
@@ -569,7 +590,7 @@
                        conn_peer.port = lchan->abis_ip.bound_port;

                        /* (Pre)Change state and modify the connection */
-                       osmo_fsm_inst_state_chg(fi, ST_WAIT_MDCX_BTS, 
MGCP_MGW_TIMEOUT, MGCP_MGW_TIMEOUT_TIMER_NR);
+                       conn_fsm_state_chg(ST_WAIT_MDCX_BTS);
                        rc = mgcp_conn_modify(conn->user_plane.fi_bts, 
GSCON_EV_MGW_MDCX_RESP_BTS, &conn_peer);
                        if (rc != 0) {
                                assignment_failed(fi, 
GSM0808_CAUSE_EQUIPMENT_FAILURE);
@@ -580,7 +601,7 @@
                        /* Confirm the successful assignment on BSSMAP and
                         * change back into active state */
                        send_ass_compl(lchan, fi, false);
-                       osmo_fsm_inst_state_chg(fi, ST_ACTIVE, 0, 0);
+                       conn_fsm_state_chg(ST_ACTIVE);
                        break;
                default:
                        /* Unsupported modes should have been already filtered
@@ -642,12 +663,11 @@
                case OSMO_SS7_ASP_PROT_IPA:
                        /* Send assignment complete message to the MSC */
                        send_ass_compl(conn->lchan, fi, true);
-                       osmo_fsm_inst_state_chg(fi, ST_ACTIVE, 0, 0);
+                       conn_fsm_state_chg(ST_ACTIVE);
                        break;
                default:
                        /* (Pre)Change state and create the connection */
-                       osmo_fsm_inst_state_chg(fi, ST_WAIT_CRCX_MSC, 
MGCP_MGW_TIMEOUT,
-                                               MGCP_MGW_TIMEOUT_TIMER_NR);
+                       conn_fsm_state_chg(ST_WAIT_CRCX_MSC);
                        conn->user_plane.fi_msc = 
mgcp_conn_create(conn->network->mgw.client, fi,
                                                                  
GSCON_EV_MGW_FAIL_MSC,
                                                                  
GSCON_EV_MGW_CRCX_RESP_MSC, &conn_peer);
@@ -694,7 +714,7 @@
                /* Send assignment complete message to the MSC */
                send_ass_compl(lchan, fi, true);

-               osmo_fsm_inst_state_chg(fi, ST_ACTIVE, 0, 0);
+               conn_fsm_state_chg(ST_ACTIVE);

                break;
        case GSCON_EV_MO_DTAP:
@@ -757,12 +777,12 @@
                conn_peer.port = lchan->abis_ip.bound_port;

                /* (Pre)Change state and modify the connection */
-               osmo_fsm_inst_state_chg(fi, ST_WAIT_MDCX_BTS_HO, 
MGCP_MGW_TIMEOUT, MGCP_MGW_HO_TIMEOUT_TIMER_NR);
+               conn_fsm_state_chg(ST_WAIT_MDCX_BTS_HO);
                rc = mgcp_conn_modify(conn->user_plane.fi_bts, 
GSCON_EV_MGW_MDCX_RESP_BTS, &conn_peer);
                if (rc != 0) {
                        resp = 
gsm0808_create_clear_rqst(GSM0808_CAUSE_EQUIPMENT_FAILURE);
                        sigtran_send(conn, resp, fi);
-                       osmo_fsm_inst_state_chg(fi, ST_CLEARING, 0, 0);
+                       conn_fsm_state_chg(ST_CLEARING);
                        return;
                }
                break;
@@ -772,7 +792,7 @@
                 * some reason. This means the phone stays on the TS/BTS on
                 * which it currently is. We will change back to the active
                 * state again as there are no further operations needed */
-               osmo_fsm_inst_state_chg(fi, ST_ACTIVE, 0, 0);
+               conn_fsm_state_chg(ST_ACTIVE);
                break;
        default:
                OSMO_ASSERT(false);
@@ -791,7 +811,7 @@
                /* The MGW has confirmed the handover MDCX, and the handover
                 * is now also done on the RTP side. We may now change back
                 * to the active state. */
-               osmo_fsm_inst_state_chg(fi, ST_ACTIVE, 0, 0);
+               conn_fsm_state_chg(ST_ACTIVE);
                break;
        case GSCON_EV_MO_DTAP:
                forward_dtap(conn, (struct msgb *)data, fi);
@@ -922,7 +942,7 @@
                break;
        case GSCON_EV_A_CLEAR_CMD:
                /* MSC tells us to cleanly shut down */
-               osmo_fsm_inst_state_chg(fi, ST_CLEARING, 0, 0);
+               conn_fsm_state_chg(ST_CLEARING);
                gsm0808_clear(conn);
                /* FIXME: Release all terestrial resources in ST_CLEARING */
                /* According to 3GPP 48.008 3.1.9.1. "The BSS need not wait for 
the radio channel
@@ -1047,7 +1067,7 @@
                assignment_failed(fi, GSM0808_CAUSE_EQUIPMENT_FAILURE);
                break;
        case MGCP_MGW_HO_TIMEOUT_TIMER_NR:      /* Handover failed (no response 
from MGW) */
-               osmo_fsm_inst_state_chg(fi, ST_ACTIVE, 0, 0);
+               conn_fsm_state_chg(ST_ACTIVE);
                break;
        default:
                OSMO_ASSERT(false);
diff --git a/src/osmo-bsc/bsc_vty.c b/src/osmo-bsc/bsc_vty.c
index f25f731..ababb3e 100644
--- a/src/osmo-bsc/bsc_vty.c
+++ b/src/osmo-bsc/bsc_vty.c
@@ -64,6 +64,7 @@
 #include <osmocom/bsc/meas_feed.h>
 #include <osmocom/bsc/neighbor_ident.h>
 #include <osmocom/bsc/handover.h>
+#include <osmocom/bsc/gsm_timers.h>

 #include <inttypes.h>

@@ -968,11 +969,6 @@
        return CMD_SUCCESS;
 }

-/* small helper macro for conditional dumping of timer */
-#define VTY_OUT_TIMER(number)  \
-       if (gsmnet->T##number != GSM_T##number##_DEFAULT)       \
-               vty_out(vty, " timer t"#number" %u%s", gsmnet->T##number, 
VTY_NEWLINE)
-
 static int config_write_net(struct vty *vty)
 {
        struct gsm_network *gsmnet = gsmnet_from_vty(vty);
@@ -993,22 +989,7 @@

        ho_vty_write_net(vty, gsmnet);

-       VTY_OUT_TIMER(3101);
-       VTY_OUT_TIMER(3103);
-       VTY_OUT_TIMER(3105);
-       VTY_OUT_TIMER(3107);
-       VTY_OUT_TIMER(3109);
-       VTY_OUT_TIMER(3111);
-       VTY_OUT_TIMER(3113);
-       VTY_OUT_TIMER(3115);
-       VTY_OUT_TIMER(3117);
-       VTY_OUT_TIMER(3119);
-       VTY_OUT_TIMER(3122);
-       VTY_OUT_TIMER(3141);
-       VTY_OUT_TIMER(10);
-       VTY_OUT_TIMER(7);
-       VTY_OUT_TIMER(8);
-       VTY_OUT_TIMER(101);
+       T_defs_vty_write(vty, " ");

        if (!gsmnet->dyn_ts_allow_tch_f)
                vty_out(vty, " dyn_ts_allow_tch_f 0%s", VTY_NEWLINE);
@@ -1021,11 +1002,8 @@
                        vty_out(vty, " timezone %d %d%s",
                                gsmnet->tz.hr, gsmnet->tz.mn, VTY_NEWLINE);
        }
-       if (gsmnet->t3212 == 0)
-               vty_out(vty, " no periodic location update%s", VTY_NEWLINE);
-       else
-               vty_out(vty, " periodic location update %u%s",
-                       gsmnet->t3212 * 6, VTY_NEWLINE);
+
+       /* writing T3212 from the common T_defs_vty_write() instead. */

        {
                uint16_t meas_port;
@@ -1889,48 +1867,6 @@
        return CMD_SUCCESS;
 }

-#define DEFAULT_TIMER(number) GSM_T##number##_DEFAULT
-/* Add another expansion so that DEFAULT_TIMER() becomes its value */
-#define EXPAND_AND_STRINGIFY(x) OSMO_STRINGIFY(x)
-
-#define DECLARE_TIMER(number, doc) \
-    DEFUN(cfg_net_T##number,                                   \
-      cfg_net_T##number##_cmd,                                 \
-      "timer t" #number  " (default|<1-65535>)",               \
-      "Configure GSM Timers\n"                                 \
-      doc " (default: " EXPAND_AND_STRINGIFY(DEFAULT_TIMER(number)) " 
seconds)\n" \
-      "Set to default timer value"                             \
-         " (" EXPAND_AND_STRINGIFY(DEFAULT_TIMER(number)) " seconds)\n" \
-      "Timer Value in seconds\n")                              \
-{                                                              \
-       struct gsm_network *gsmnet = gsmnet_from_vty(vty);      \
-       int value;                                              \
-       if (strcmp(argv[0], "default") == 0)                    \
-               value = DEFAULT_TIMER(number);                  \
-       else                                                    \
-               value = atoi(argv[0]);                          \
-                                                               \
-       gsmnet->T##number = value;                              \
-       return CMD_SUCCESS;                                     \
-}
-
-DECLARE_TIMER(3101, "Set the timeout value for IMMEDIATE ASSIGNMENT")
-DECLARE_TIMER(3103, "Set the timeout value for HANDOVER")
-DECLARE_TIMER(3105, "Set the timer for repetition of PHYSICAL INFORMATION")
-DECLARE_TIMER(3107, "Currently not used")
-DECLARE_TIMER(3109, "Set the RSL SACCH deactivation timeout")
-DECLARE_TIMER(3111, "Set the RSL timeout to wait before releasing the RF 
Channel")
-DECLARE_TIMER(3113, "Set the time to try paging a subscriber")
-DECLARE_TIMER(3115, "Currently not used")
-DECLARE_TIMER(3117, "Currently not used")
-DECLARE_TIMER(3119, "Currently not used")
-DECLARE_TIMER(3122, "Default waiting time (seconds) after IMM ASS REJECT")
-DECLARE_TIMER(3141, "Currently not used")
-DECLARE_TIMER(10, "Assignment Command timeout in seconds")
-DECLARE_TIMER(7, "Set the outgoing inter-BSC Handover timeout, from Handover 
Required to Handover Command")
-DECLARE_TIMER(8, "Set the outgoing inter-BSC Handover timeout, from Handover 
Command to final Clear")
-DECLARE_TIMER(101, "Set the incoming inter-BSC Handover timeout, from Handover 
Request to Accept")
-
 DEFUN_DEPRECATED(cfg_net_dtx,
                 cfg_net_dtx_cmd,
                 "dtx-used (0|1)",
@@ -4734,9 +4670,11 @@
       "Periodic Location Updating Interval in Minutes\n")
 {
        struct gsm_network *net = vty->index;
+       struct T_def *d = T_def_get_entry(net->T_defs, 3212);

-       net->t3212 = atoi(argv[0]) / 6;
-
+       OSMO_ASSERT(d);
+       d->val = atoi(argv[0]) / 6;
+       vty_out(vty, "T%d = %u %s (%s)%s", d->T, d->val, "* 6min", d->desc, 
VTY_NEWLINE);
        return CMD_SUCCESS;
 }

@@ -4748,9 +4686,11 @@
       "Periodic Location Updating Interval\n")
 {
        struct gsm_network *net = vty->index;
+       struct T_def *d = T_def_get_entry(net->T_defs, 3212);

-       net->t3212 = 0;
-
+       OSMO_ASSERT(d);
+       d->val = 0;
+       vty_out(vty, "T%d = %u %s (%s)%s", d->T, d->val, "* 6min", d->desc, 
VTY_NEWLINE);
        return CMD_SUCCESS;
 }

@@ -4842,23 +4782,9 @@
        logging_vty_add_cmds(NULL);
        osmo_talloc_vty_add_cmds();

+       T_defs_vty_init(network->T_defs, GSMNET_NODE);
+
        install_element(GSMNET_NODE, &cfg_net_neci_cmd);
-       install_element(GSMNET_NODE, &cfg_net_T3101_cmd);
-       install_element(GSMNET_NODE, &cfg_net_T3103_cmd);
-       install_element(GSMNET_NODE, &cfg_net_T3105_cmd);
-       install_element(GSMNET_NODE, &cfg_net_T3107_cmd);
-       install_element(GSMNET_NODE, &cfg_net_T3109_cmd);
-       install_element(GSMNET_NODE, &cfg_net_T3111_cmd);
-       install_element(GSMNET_NODE, &cfg_net_T3113_cmd);
-       install_element(GSMNET_NODE, &cfg_net_T3115_cmd);
-       install_element(GSMNET_NODE, &cfg_net_T3117_cmd);
-       install_element(GSMNET_NODE, &cfg_net_T3119_cmd);
-       install_element(GSMNET_NODE, &cfg_net_T3122_cmd);
-       install_element(GSMNET_NODE, &cfg_net_T3141_cmd);
-       install_element(GSMNET_NODE, &cfg_net_T10_cmd);
-       install_element(GSMNET_NODE, &cfg_net_T7_cmd);
-       install_element(GSMNET_NODE, &cfg_net_T8_cmd);
-       install_element(GSMNET_NODE, &cfg_net_T101_cmd);
        install_element(GSMNET_NODE, &cfg_net_dtx_cmd);
        install_element(GSMNET_NODE, &cfg_net_pag_any_tch_cmd);
        /* See also handover commands added on net level from handover_vty.c */
diff --git a/src/osmo-bsc/bts_ipaccess_nanobts_omlattr.c 
b/src/osmo-bsc/bts_ipaccess_nanobts_omlattr.c
index 1a8d9b0..d674c18 100644
--- a/src/osmo-bsc/bts_ipaccess_nanobts_omlattr.c
+++ b/src/osmo-bsc/bts_ipaccess_nanobts_omlattr.c
@@ -23,6 +23,7 @@
 #include <osmocom/core/msgb.h>
 #include <osmocom/bsc/gsm_data.h>
 #include <osmocom/bsc/abis_nm.h>
+#include <osmocom/bsc/gsm_timers.h>

 static void patch_16(uint8_t *data, const uint16_t val)
 {
@@ -90,7 +91,7 @@
        msgb_tv_fixed_put(msgb, NM_ATT_LDAVG_SLOTS, 2, buf);

        /* 10 milliseconds */
-       msgb_tv_put(msgb, NM_ATT_BTS_AIR_TIMER, bts->network->T3105 > 0? 
bts->network->T3105 : 13);
+       msgb_tv_put(msgb, NM_ATT_BTS_AIR_TIMER, T_def_get(bts->network->T_defs, 
3105, T_MS, -1));

        /* 10 retransmissions of physical config */
        msgb_tv_put(msgb, NM_ATT_NY1, 10);
diff --git a/src/osmo-bsc/bts_siemens_bs11.c b/src/osmo-bsc/bts_siemens_bs11.c
index 2d23517..1da189f 100644
--- a/src/osmo-bsc/bts_siemens_bs11.c
+++ b/src/osmo-bsc/bts_siemens_bs11.c
@@ -27,6 +27,7 @@
 #include <osmocom/bsc/abis_nm.h>
 #include <osmocom/abis/e1_input.h>
 #include <osmocom/bsc/signal.h>
+#include <osmocom/bsc/gsm_timers.h>

 static int bts_model_bs11_start(struct gsm_network *net);

@@ -358,7 +359,7 @@
        uint8_t arfcn_high = (bts->c0->arfcn >> 8) & 0x0f;

        /* T3105 attribute in units of 10ms */
-       bs11_attr_bts[2] = bts->network->T3105 / 10;
+       bs11_attr_bts[2] = T_def_get(bts->network->T_defs, 3105, T_MS, -1) / 10;

        /* patch ARFCN into BTS Attributes */
        bs11_attr_bts[69] &= 0xf0;
diff --git a/src/osmo-bsc/gsm_data.c b/src/osmo-bsc/gsm_data.c
index 734e2fb..0ff17f2 100644
--- a/src/osmo-bsc/gsm_data.c
+++ b/src/osmo-bsc/gsm_data.c
@@ -39,6 +39,7 @@
 #include <osmocom/bsc/bsc_msc_data.h>
 #include <osmocom/bsc/abis_nm.h>
 #include <osmocom/bsc/handover_cfg.h>
+#include <osmocom/bsc/gsm_timers.h>

 void *tall_bsc_ctx = NULL;

@@ -863,7 +864,7 @@
        bts->si_common.chan_desc.att = 1; /* attachment required */
        bts->si_common.chan_desc.bs_pa_mfrms = RSL_BS_PA_MFRMS_5; /* paging 
frames */
        bts->si_common.chan_desc.bs_ag_blks_res = 1; /* reserved AGCH blocks */
-       bts->si_common.chan_desc.t3212 = net->t3212; /* Use network's current 
value */
+       bts->si_common.chan_desc.t3212 = T_def_get(net->T_defs, 3212, T_CUSTOM, 
-1);
        gsm_bts_set_radio_link_timeout(bts, 32); /* Use RADIO LINK TIMEOUT of 
32 */

        INIT_LLIST_HEAD(&bts->abis_queue);
diff --git a/src/osmo-bsc/gsm_timers.c b/src/osmo-bsc/gsm_timers.c
new file mode 100644
index 0000000..2f73793
--- /dev/null
+++ b/src/osmo-bsc/gsm_timers.c
@@ -0,0 +1,206 @@
+/* Implementation to define Tnnn timers globally and use for FSM state 
changes. */
+/* (C) 2018 by sysmocom - s.f.m.c. GmbH <i...@sysmocom.de>
+ *
+ * Author: Neels Hofmeyr <ne...@hofmeyr.de>
+ *
+ * All Rights Reserved
+ *
+ * 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/fsm.h>
+
+#include <osmocom/bsc/gsm_timers.h>
+
+/* a = return_val * b. Return 0 if factor is below 1. */
+static int T_factor(enum T_unit a, enum T_unit b)
+{
+       if (b == a
+           || b == T_CUSTOM || a == T_CUSTOM)
+               return 1;
+
+       switch (b) {
+       case T_MS:
+               switch (a) {
+               case T_S:
+                       return 1000;
+               case T_M:
+                       return 60*1000;
+               default:
+                       return 0;
+               }
+       case T_S:
+               switch (a) {
+               case T_M:
+                       return 60;
+               default:
+                       return 0;
+               }
+       default:
+               return 0;
+       }
+}
+
+static int T_round(int val, enum T_unit from_unit, enum T_unit to_unit)
+{
+       int f;
+       if (!val)
+               return 0;
+
+       f = T_factor(from_unit, to_unit);
+       if (f < 1) {
+               f = T_factor(to_unit, from_unit);
+               return (val / f) + (val % f? 1 : 0);
+       }
+       return val * f;
+}
+
+/* Return the value of a T timer from a list of T_defs.
+ * Any value is rounded up to match as_unit: 1100 ms as T_S becomes 2 seconds, 
as T_M becomes one minute.
+ * If no such timer is defined, return the default value passed, or abort the 
program if default < 0.
+ *
+ * Usage examples:
+ *
+ * - Initialization:
+ *
+ *     struct T_def global_T_defs[] = {
+ *             { .T=7, .default_val=60, .desc="Water Boiling Timeout" },  // 
default is .unit=T_S == 0
+ *             { .T=8, .default_val=300, .desc="Tea brewing" },
+ *             { .T=9, .default_val=5, .unit=T_M, .desc="Let tea cool down 
before drinking" },
+ *             { .T=10, .default_val=20, .unit=T_M, .desc="Forgot to drink tea 
while it's warm" },
+ *             {}  //  <-- important! last entry shall be zero
+ *     };
+ *     T_defs_reset(global_T_defs); // make all values the default
+ *     T_defs_vty_init(global_T_defs, CONFIG_NODE);
+ *
+ *     val = T_def_get(global_T_defs, 7, T_S, -1); // -> 10
+ *     sleep(val);
+ *
+ *     val = T_def_get(global_T_defs, 7, T_M, -1); // 10 seconds becomes 1 
minute -> 1
+ *     sleep_minutes(val);
+ *
+ *     val = T_def_get(global_T_defs, 99, T_S, -1); // not defined, program 
aborts!
+ *
+ *     val = T_def_get(global_T_defs, 99, T_S, 3); // not defined, returns 3
+ */
+int T_def_get(struct T_def *T_defs, int T, enum T_unit as_unit, int 
val_if_not_present)
+{
+       struct T_def *d = T_def_get_entry(T_defs, T);
+       if (!d) {
+               OSMO_ASSERT(val_if_not_present >= 0);
+               return val_if_not_present;
+       }
+       return T_round(d->val, d->unit, as_unit);
+}
+
+/* Set all T_def values to the default_val. */
+void T_defs_reset(struct T_def *T_defs)
+{
+       struct T_def *d;
+       for_each_T_def(d, T_defs)
+               d->val = d->default_val;
+}
+
+/* Return a pointer to a T_def from an array, or NULL. */
+struct T_def *T_def_get_entry(struct T_def *T_defs, int T)
+{
+       struct T_def *d;
+       for_each_T_def(d, T_defs) {
+               if (d->T == T)
+                       return d;
+       }
+       return NULL;
+}
+
+/* Return a state_timeout entry from an array, or return NULL if the entry is 
zero.
+ *
+ * The timeouts_array shall contain exactly 32 elements, which corresponds to 
the number of states
+ * allowed by osmo_fsm_*. Lookup is by array index.
+ *
+ * For example:
+ *     struct state_timeout my_fsm_timeouts[32] = {
+ *             [MY_FSM_STATE_3] = { .T = 423 },
+ *             [MY_FSM_STATE_7] = { .T = 235 },
+ *             [MY_FSM_STATE_8] = { .keep_timer = true },
+ *             // any state that is omitted will remain zero == no timeout
+ *     };
+ *     get_state_timeout(MY_FSM_STATE_0, &my_fsm_timeouts) -> NULL,
+ *     get_state_timeout(MY_FSM_STATE_7, &my_fsm_timeouts) -> { .T = 235 }
+ *
+ * The intention is then to obtain the timer like T_def_get(global_T_defs, 
T=235); see also
+ * fsm_inst_state_chg_T() below.
+ */
+struct state_timeout *get_state_timeout(uint32_t state, struct state_timeout 
*timeouts_array)
+{
+       struct state_timeout *t;
+       OSMO_ASSERT(state < 32);
+       t = &timeouts_array[state];
+       if (!t->keep_timer && !t->T)
+               return NULL;
+       return t;
+}
+
+/* Call osmo_fsm_inst_state_chg() or osmo_fsm_inst_state_chg_keep_timer(), 
depending on the T value
+ * defined for this state in the timeouts_array, and obtaining the actual 
timeout value from T_defs.
+ * A T timer configured in sub-second precision is rounded up to the next full 
second.
+ *
+ * See get_state_timeout() and T_def_get().
+ *
+ * Should a T number be defined in timeouts_array that is not defined in 
T_defs, use default_timeout.
+ * This is best used by wrapping this function call in a macro suitable for a 
specific FSM
+ * implementation, which can become as short as: my_fsm_state_chg(fi, 
NEXT_STATE):
+ *
+ * #define my_fsm_state_chg(fi, NEXT_STATE) \
+ *     fsm_inst_state_chg_T(fi, NEXT_STATE, my_fsm_timeouts, global_T_defs, 5)
+ *
+ * my_fsm_state_chg(fi, MY_FSM_STATE_1);
+ * // -> No timeout configured, will enter state without timeout.
+ *
+ * my_fsm_state_chg(fi, MY_FSM_STATE_3);
+ * // T423 configured for this state, will look up T423 in T_defs, or use 5 
seconds if unset.
+ *
+ * my_fsm_state_chg(fi, MY_FSM_STATE_8);
+ * // keep_timer configured for this state, will invoke 
osmo_fsm_inst_state_chg_keep_timer().
+ *
+ */
+int _fsm_inst_state_chg_T(struct osmo_fsm_inst *fi, uint32_t state,
+                         struct state_timeout *timeouts_array,
+                         struct T_def *T_defs, int default_timeout,
+                         const char *file, int line)
+{
+       struct state_timeout *t = get_state_timeout(state, timeouts_array);
+       int val;
+
+       /* No timeout defined for this state? */
+       if (!t)
+               return _osmo_fsm_inst_state_chg(fi, state, 0, 0, file, line);
+
+       if (t->keep_timer) {
+               int rc = _osmo_fsm_inst_state_chg_keep_timer(fi, state, file, 
line);
+               if (t->T && !rc)
+                       fi->T = t->T;
+               return rc;
+       }
+
+       val = T_def_get(T_defs, t->T, T_S, default_timeout);
+       return _osmo_fsm_inst_state_chg(fi, state, val, t->T, file, line);
+}
+
+const struct value_string T_unit_names[] = {
+       { T_S, "s" },
+       { T_MS, "ms" },
+       { T_CUSTOM, "(custom)" },
+       { 0, NULL }
+};
diff --git a/src/osmo-bsc/gsm_timers_vty.c b/src/osmo-bsc/gsm_timers_vty.c
new file mode 100644
index 0000000..8a13259
--- /dev/null
+++ b/src/osmo-bsc/gsm_timers_vty.c
@@ -0,0 +1,117 @@
+/* Implementation to configure Tnnn timers in VTY */
+/* (C) 2018 by sysmocom - s.f.m.c. GmbH <i...@sysmocom.de>
+ *
+ * Author: Neels Hofmeyr <ne...@hofmeyr.de>
+ *
+ * All Rights Reserved
+ *
+ * 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 <string.h>
+
+#include <osmocom/vty/vty.h>
+#include <osmocom/vty/command.h>
+
+#include <osmocom/bsc/gsm_timers.h>
+
+/* Global singleton list used for the VTY configuration. See 
T_defs_vty_init(). */
+static struct T_def *g_vty_T_defs = NULL;
+
+/* Parse an argument like "T1234", "t1234" or "1234" and return the 
corresponding T_def entry from
+ * g_vty_T_defs, if any. */
+static struct T_def *parse_T_arg(struct vty *vty, const char *T_str)
+{
+       int T;
+       struct T_def *d;
+
+       if (T_str[0] == 't' || T_str[0] == 'T')
+               T_str++;
+       T = atoi(T_str);
+
+       d = T_def_get_entry(g_vty_T_defs, T);
+       if (!d)
+               vty_out(vty, "No such timer: T%d%s", T, VTY_NEWLINE);
+       return d;
+}
+
+/* Installed in the VTY on T_defs_vty_init(). */
+DEFUN(cfg_timer, cfg_timer_cmd,
+      "timer TNNNN (default|<1-65535>)",
+      "Configure GSM Timers\n"
+      "T-number, optionally preceded by 't' or 'T'."
+      "See also 'show timer' for a list of available timers.\n"
+      "Set to default timer value\n" "Timer value\n")
+{
+       const char *val_str = argv[1];
+       struct T_def *d;
+
+       d = parse_T_arg(vty, argv[0]);
+       if (!d)
+               return CMD_WARNING;
+
+       if (!strcmp(val_str, "default"))
+               d->val = d->default_val;
+       else
+               d->val = atoi(val_str);
+       vty_out(vty, "T%d = %u %s (%s)%s", d->T, d->val, T_unit_name(d->unit), 
d->desc, VTY_NEWLINE);
+       return CMD_SUCCESS;
+}
+
+/* Print a T_def to the VTY. */
+static void show_one_timer(struct vty *vty, struct T_def *d)
+{
+       vty_out(vty, "T%d = %u %s (default = %u %s) \t%s%s",
+               d->T, d->val, T_unit_name(d->unit),
+               d->default_val, T_unit_name(d->unit), d->desc, VTY_NEWLINE);
+}
+
+/* Installed in the VTY on T_defs_vty_init(). */
+DEFUN(show_timer, show_timer_cmd,
+      "show timer [TNNNN]",
+      SHOW_STR "GSM Timers\n"
+      "Specific timer to show, or all timers if omitted.\n")
+{
+       struct T_def *d;
+
+       if (argc) {
+               d = parse_T_arg(vty, argv[0]);
+               if (!d)
+                       return CMD_WARNING;
+               show_one_timer(vty, d);
+               return CMD_SUCCESS;
+       }
+
+       for_each_T_def(d, g_vty_T_defs)
+               show_one_timer(vty, d);
+       return CMD_SUCCESS;
+}
+
+/* Install GSM timer configuration commands in the VTY. */
+void T_defs_vty_init(struct T_def *T_defs, int cfg_parent_node)
+{
+       install_element_ve(&show_timer_cmd);
+       install_element(cfg_parent_node, &cfg_timer_cmd);
+}
+
+/* Write GSM timer configuration to the vty. */
+void T_defs_vty_write(struct vty *vty, const char *indent)
+{
+       struct T_def *d;
+       for_each_T_def(d, g_vty_T_defs) {
+               if (d->val != d->default_val)
+                       vty_out(vty, "%stimer t%d %u%s", indent, d->T, d->val, 
VTY_NEWLINE);
+       }
+}
diff --git a/src/osmo-bsc/net_init.c b/src/osmo-bsc/net_init.c
index db3d01c..a802a7c 100644
--- a/src/osmo-bsc/net_init.c
+++ b/src/osmo-bsc/net_init.c
@@ -23,6 +23,34 @@
 #include <osmocom/bsc/handover_cfg.h>
 #include <osmocom/bsc/chan_alloc.h>
 #include <osmocom/bsc/neighbor_ident.h>
+#include <osmocom/bsc/gsm_timers.h>
+
+static struct T_def gsm_network_T_defs[] = {
+       { .T=7, .default_val=10, .desc="inter-BSC Handover MO, HO Required to 
HO Command" },
+       { .T=8, .default_val=10, .desc="inter-BSC Handover MO, HO Command to 
final Clear" },
+       { .T=10, .default_val=6, .desc="RR Assignment" },
+       { .T=101, .default_val=10, .desc="inter-BSC Handover MT, HO Request to 
HO Accept" },
+       { .T=3101, .default_val=3, .desc="RR Immediate Assignment" },
+       { .T=3103, .default_val=5, .desc="Handover" },
+       { .T=3105, .default_val=100, .unit=T_MS, .desc="Physical Information" },
+       { .T=3107, .default_val=5, .desc="(unused)" },
+       { .T=3109, .default_val=5, .desc="RSL SACCH deactivation" },
+       { .T=3111, .default_val=2, .desc="Wait time before RSL RF Channel 
Release" },
+       { .T=993111, .default_val=4, .desc="Wait time after lchan was released 
in error"
+               "(should be T3111 + 2s)" },
+       { .T=3113, .default_val=10, .desc="Paging"},
+       { .T=3115, .default_val=10, .desc="(unused)" },
+       { .T=3117, .default_val=10, .desc="(unused)" },
+       { .T=3119, .default_val=10, .desc="(unused)" },
+       { .T=3122, .default_val=GSM_T3122_DEFAULT, .desc="Wait time after RR 
Immediate Assignment Reject" },
+       { .T=3141, .default_val=10, .desc="(unused)" },
+       { .T=3212, .default_val=5, .unit=T_CUSTOM,
+               .desc="Periodic Location Update timer, sent to MS (1 = 6 
minutes)" },
+       { .T=993210, .default_val=20, .desc="After L3 Complete, wait for MSC to 
confirm" },
+       { .T=999, .default_val=60, .desc="After Clear Request, wait for MSC to 
Clear Command (sanity)" },
+       { .T=992427, .default_val=4, .desc="MGCP timeout (2427 is the default 
MGCP port number)" },
+       {}
+};

 /* Initialize the bare minimum of struct gsm_network, minimizing required 
dependencies.
  * This part is shared among the thin programs in osmo-bsc/src/utils/.
@@ -43,9 +71,6 @@
        /* Permit a compile-time default of A5/3 and A5/1 */
        net->a5_encryption_mask = (1 << 3) | (1 << 1);

-       /* Use 30 min periodic update interval as sane default */
-       net->t3212 = 5;
-
        INIT_LLIST_HEAD(&net->subscr_conns);

        net->bsc_subscribers = talloc_zero(net, struct llist_head);
@@ -53,22 +78,9 @@

        INIT_LLIST_HEAD(&net->bts_list);
        net->num_bts = 0;
-       net->T3101 = GSM_T3101_DEFAULT;
-       net->T3103 = GSM_T3103_DEFAULT;
-       net->T3105 = GSM_T3105_DEFAULT;
-       net->T3107 = GSM_T3107_DEFAULT;
-       net->T3109 = GSM_T3109_DEFAULT;
-       net->T3111 = GSM_T3111_DEFAULT;
-       net->T3113 = GSM_T3113_DEFAULT;
-       net->T3115 = GSM_T3115_DEFAULT;
-       net->T3117 = GSM_T3117_DEFAULT;
-       net->T3119 = GSM_T3119_DEFAULT;
-       net->T3122 = GSM_T3122_DEFAULT;
-       net->T3141 = GSM_T3141_DEFAULT;
-       net->T10 = GSM_T10_DEFAULT;
-       net->T7 = GSM_T7_DEFAULT;
-       net->T8 = GSM_T8_DEFAULT;
-       net->T101 = GSM_T101_DEFAULT;
+
+       net->T_defs = gsm_network_T_defs;
+       T_defs_reset(net->T_defs);

        return net;
 }
diff --git a/src/osmo-bsc/paging.c b/src/osmo-bsc/paging.c
index feb9fea..b75d731 100644
--- a/src/osmo-bsc/paging.c
+++ b/src/osmo-bsc/paging.c
@@ -51,6 +51,7 @@
 #include <osmocom/bsc/chan_alloc.h>
 #include <osmocom/bsc/bsc_api.h>
 #include <osmocom/bsc/gsm_04_08_utils.h>
+#include <osmocom/bsc/gsm_timers.h>

 void *tall_paging_ctx = NULL;

@@ -315,7 +316,7 @@
        req->chan_type = type;
        req->msc = msc;
        osmo_timer_setup(&req->T3113, paging_T3113_expired, req);
-       osmo_timer_schedule(&req->T3113, bts->network->T3113, 0);
+       osmo_timer_schedule(&req->T3113, T_def_get(bts->network->T_defs, 3113, 
T_S, -1), 0);
        llist_add_tail(&req->entry, &bts_entry->pending_requests);
        paging_schedule_if_needed(bts_entry);

diff --git a/src/utils/Makefile.am b/src/utils/Makefile.am
index 543344b..f8b536b 100644
--- a/src/utils/Makefile.am
+++ b/src/utils/Makefile.am
@@ -122,6 +122,7 @@

 meas_json_LDADD = \
        $(top_builddir)/src/osmo-bsc/gsm_data.o \
+       $(top_builddir)/src/osmo-bsc/gsm_timers.o \
        $(LIBOSMOCORE_LIBS) \
        $(LIBOSMOGSM_LIBS) \
        $(LIBOSMOABIS_LIBS) \
diff --git a/tests/abis/Makefile.am b/tests/abis/Makefile.am
index 60054d9..4fc3605 100644
--- a/tests/abis/Makefile.am
+++ b/tests/abis/Makefile.am
@@ -27,6 +27,7 @@
 abis_test_LDADD = \
        $(top_builddir)/src/osmo-bsc/abis_nm.o \
        $(top_builddir)/src/osmo-bsc/gsm_data.o \
+       $(top_builddir)/src/osmo-bsc/gsm_timers.o \
        $(top_builddir)/src/osmo-bsc/net_init.o \
        $(LIBOSMOCORE_LIBS) \
        $(LIBOSMOABIS_LIBS) \
diff --git a/tests/bsc/Makefile.am b/tests/bsc/Makefile.am
index 2e34d79..57e8837 100644
--- a/tests/bsc/Makefile.am
+++ b/tests/bsc/Makefile.am
@@ -43,6 +43,7 @@
        $(top_builddir)/src/osmo-bsc/gsm_04_08_utils.o \
        $(top_builddir)/src/osmo-bsc/gsm_04_80_utils.o \
        $(top_builddir)/src/osmo-bsc/gsm_data.o \
+       $(top_builddir)/src/osmo-bsc/gsm_timers.o \
        $(top_builddir)/src/osmo-bsc/handover_cfg.o \
        $(top_builddir)/src/osmo-bsc/handover_logic.o \
        $(top_builddir)/src/osmo-bsc/neighbor_ident.o \
diff --git a/tests/gsm0408/Makefile.am b/tests/gsm0408/Makefile.am
index 3eb47f6..d790fc8 100644
--- a/tests/gsm0408/Makefile.am
+++ b/tests/gsm0408/Makefile.am
@@ -25,6 +25,7 @@
 gsm0408_test_LDADD = \
        $(top_builddir)/src/osmo-bsc/arfcn_range_encode.o \
        $(top_builddir)/src/osmo-bsc/gsm_data.o \
+       $(top_builddir)/src/osmo-bsc/gsm_timers.o \
        $(top_builddir)/src/osmo-bsc/net_init.o \
        $(top_builddir)/src/osmo-bsc/rest_octets.o \
        $(top_builddir)/src/osmo-bsc/system_information.o \
diff --git a/tests/handover/Makefile.am b/tests/handover/Makefile.am
index 2f84d7a..180bffe 100644
--- a/tests/handover/Makefile.am
+++ b/tests/handover/Makefile.am
@@ -52,6 +52,7 @@
        $(top_builddir)/src/osmo-bsc/gsm_04_08_utils.o \
        $(top_builddir)/src/osmo-bsc/gsm_04_80_utils.o \
        $(top_builddir)/src/osmo-bsc/gsm_data.o \
+       $(top_builddir)/src/osmo-bsc/gsm_timers.o \
        $(top_builddir)/src/osmo-bsc/handover_cfg.o \
        $(top_builddir)/src/osmo-bsc/handover_decision.o \
        $(top_builddir)/src/osmo-bsc/handover_decision_2.o \
diff --git a/tests/nanobts_omlattr/Makefile.am 
b/tests/nanobts_omlattr/Makefile.am
index aa7045e..312cf7d 100644
--- a/tests/nanobts_omlattr/Makefile.am
+++ b/tests/nanobts_omlattr/Makefile.am
@@ -26,6 +26,7 @@
        $(top_builddir)/src/osmo-bsc/abis_nm.o \
        $(top_builddir)/src/osmo-bsc/bts_ipaccess_nanobts_omlattr.o \
        $(top_builddir)/src/osmo-bsc/gsm_data.o \
+       $(top_builddir)/src/osmo-bsc/gsm_timers.o \
        $(LIBOSMOCORE_LIBS) \
        $(LIBOSMOGSM_LIBS) \
        $(LIBOSMOABIS_LIBS) \
diff --git a/tests/nanobts_omlattr/nanobts_omlattr_test.c 
b/tests/nanobts_omlattr/nanobts_omlattr_test.c
index 72dabe5..7a3a80e 100644
--- a/tests/nanobts_omlattr/nanobts_omlattr_test.c
+++ b/tests/nanobts_omlattr/nanobts_omlattr_test.c
@@ -21,6 +21,7 @@

 #include <osmocom/bsc/debug.h>
 #include <osmocom/bsc/gsm_data.h>
+#include <osmocom/bsc/gsm_timers.h>
 #include <osmocom/bsc/bts_ipaccess_nanobts_omlattr.h>

 #include <osmocom/core/talloc.h>
@@ -191,6 +192,13 @@
        .num_cat = ARRAY_SIZE(log_categories),
 };

+static struct T_def gsm_network_T_defs[] = {
+       { .T=3105, .default_val=100, .val=13, .unit=T_MS, .desc="Physical 
Information" },
+       { .T=3212, .default_val=5, .unit=T_CUSTOM,
+               .desc="Periodic Location Update timer, sent to MS (1 = 6 
minutes)" },
+       {}
+};
+
 int main(int argc, char **argv)
 {
        void *ctx;
@@ -207,6 +215,7 @@
        /* Allocate environmental structs (bts, net, trx) */
        net = talloc_zero(ctx, struct gsm_network);
        INIT_LLIST_HEAD(&net->bts_list);
+       net->T_defs = gsm_network_T_defs;
        gsm_bts_model_register(&bts_model_nanobts);
        bts = gsm_bts_alloc_register(net, GSM_BTS_TYPE_NANOBTS, 63);
        OSMO_ASSERT(bts);

--
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Gerrit-Project: osmo-bsc
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: If212fcd042051b6fa53484254223614c5b93a9c6
Gerrit-Change-Number: 9670
Gerrit-PatchSet: 1
Gerrit-Owner: Neels Hofmeyr <nhofm...@sysmocom.de>

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