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make sure early lchan act failure resets the lchan 

Fix crash after AMR configuration fails.

The crash is due to an assertion that finds a non-NULL conn in the lchan, when
re-using an lchan that has failed in AMR configuration earlier on. That is
because the AMR config still happens in state UNUSED.

  DCHAN ERROR lchan(0-0-2-TCH_F_TCH_H_PDCH-0)[0x6120000066a0]{UNUSED}: (type=TCH_F) lchan allocation failed in state UNUSED: Can not generate multirate configuration IE
  ...
  DCHAN DEBUG lchan(0-0-2-TCH_F_TCH_H_PDCH-0)[0x6120000066a0]{UNUSED}: (type=TCH_F) After failure handling, already in state UNUSED
  ...
  ...
  DCHAN DEBUG lchan(0-0-2-TCH_F_TCH_H_PDCH-0)[0x6120000066a0]{UNUSED}: Received Event LCHAN_EV_ACTIVATE (lchan_fsm.c:324)
  Assert failed !lchan->conn ../../../../src/osmo-bsc/src/osmo-bsc/lchan_fsm.c:491

The FSM design idea is that when returning to the UNUSED state, all lchan state
is cleared. However, when calling lchan_activate(), a failure may happen still
in state UNUSED, so that we don't transition *back* to UNUSED properly.

So, first transition out of UNUSED before failures can happen. (Other ways to
solve this would be to invoke lchan clearing even if already in UNUSED, but
semantically, transitioning first makes more sense.)

Upon LCHAN_EV_ACTIVATE, just remember the lchan_activate_info and transition to
WAIT_TS_READY, so that on lchan_fail(), we can normally transition back to
UNUSED and clear the lchan.

Move the initial lchan activation code to lchan_fsm_wait_ts_ready_onenter().

Also, there is a bit of duplication of members of the lchan->activate (lchan
state) and the lchan_activate_info (passed to lchan_activate()) structs. The
fix for this also removes the dup:

Add struct lchan_activate_info as child struct at lchan->activate.info, drop
the other lchan->activate members that would dup .info.*. Move struct
lchan_activate_info declaration to gsm_data.h.

Apply the new '.info' member struct throughout the code.

Related: OS#3737
Change-Id: Ide665b10fa3f4583059c55346db8da833959e3cc
This commit is contained in:
Neels Hofmeyr 2018-12-19 17:19:02 +01:00
parent 64a3bbe093
commit 0277ab2139
8 changed files with 105 additions and 107 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
include/osmocom/bsc/gsm_data.h
View File

@ -503,6 +503,19 @@ extern const struct value_string lchan_activate_mode_names[];
static inline const char *lchan_activate_mode_name(enum lchan_activate_mode activ_for)
{ return get_value_string(lchan_activate_mode_names, activ_for); }
struct lchan_activate_info {
enum lchan_activate_mode activ_for;
struct gsm_subscriber_connection *for_conn;
/* This always is for a specific lchan, so its lchan->type indicates full or half rate.
* When a dyn TS was selected, the lchan->type has been set to the desired rate. */
enum gsm48_chan_mode chan_mode;
uint16_t s15_s0;
bool requires_voice_stream;
bool wait_before_switching_rtp; /*< true = requires LCHAN_EV_READY_TO_SWITCH_RTP */
uint16_t msc_assigned_cic;
struct gsm_lchan *re_use_mgw_endpoint_from_lchan;
};
struct gsm_lchan {
/* The TS that we're part of */
struct gsm_bts_trx_ts *ts;
@ -517,18 +530,14 @@ struct gsm_lchan {
struct mgwep_ci *mgw_endpoint_ci_bts;
struct {
enum lchan_activate_mode activ_for;
struct lchan_activate_info info;
bool activ_ack; /*< true as soon as RSL Chan Activ Ack is received */
bool immediate_assignment_sent;
/*! This flag ensures that when an lchan activation has succeeded, and we have already
* sent ACKs like Immediate Assignment or BSSMAP Assignment Complete, and if other errors
* occur later, e.g. during release, that we don't send a NACK out of context. */
bool concluded;
bool requires_voice_stream;
bool wait_before_switching_rtp; /*< true = requires LCHAN_EV_READY_TO_SWITCH_RTP */
uint16_t msc_assigned_cic;
enum gsm0808_cause gsm0808_error_cause;
struct gsm_lchan *re_use_mgw_endpoint_from_lchan;
} activate;
struct {

13
include/osmocom/bsc/lchan_fsm.h
View File

@ -52,19 +52,6 @@ void lchan_fsm_alloc(struct gsm_lchan *lchan);
void lchan_release(struct gsm_lchan *lchan, bool do_rr_release,
bool err, enum gsm48_rr_cause cause_rr);
struct lchan_activate_info {
enum lchan_activate_mode activ_for;
struct gsm_subscriber_connection *for_conn;
/* This always is for a specific lchan, so its lchan->type indicates full or half rate.
* When a dyn TS was selected, the lchan->type has been set to the desired rate. */
enum gsm48_chan_mode chan_mode;
uint16_t s15_s0;
bool requires_voice_stream;
bool wait_before_switching_rtp;
uint16_t msc_assigned_cic;
struct gsm_lchan *old_lchan;
};
void lchan_activate(struct gsm_lchan *lchan, struct lchan_activate_info *info);
void lchan_ready_to_switch_rtp(struct gsm_lchan *lchan);

2
src/osmo-bsc/assignment_fsm.c
View File

@ -422,7 +422,7 @@ void assignment_fsm_start(struct gsm_subscriber_connection *conn, struct gsm_bts
.s15_s0 = req->s15_s0,
.requires_voice_stream = conn->assignment.requires_voice_stream,
.msc_assigned_cic = req->msc_assigned_cic,
.old_lchan = conn->lchan,
.re_use_mgw_endpoint_from_lchan = conn->lchan,
};
lchan_activate(conn->assignment.new_lchan, &info);
}

2
src/osmo-bsc/bsc_subscr_conn_fsm.c
View File

@ -550,7 +550,7 @@ bool gscon_connect_mgw_to_msc(struct gsm_subscriber_connection *conn,
} else
verb = MGCP_VERB_CRCX;
gscon_ensure_mgw_endpoint(conn, for_lchan->activate.msc_assigned_cic);
gscon_ensure_mgw_endpoint(conn, for_lchan->activate.info.msc_assigned_cic);
if (!conn->user_plane.mgw_endpoint) {
LOGPFSML(conn->fi, LOGL_ERROR, "Unable to allocate endpoint info\n");

6
src/osmo-bsc/handover_fsm.c
View File

@ -360,7 +360,7 @@ static void handover_start_intra_bsc(struct gsm_subscriber_connection *conn)
.chan_mode = conn->lchan->tch_mode,
.requires_voice_stream = conn->lchan->mgw_endpoint_ci_bts ? true : false,
.msc_assigned_cic = conn->ho.inter_bsc_in.msc_assigned_cic,
.old_lchan = conn->lchan,
.re_use_mgw_endpoint_from_lchan = conn->lchan,
.wait_before_switching_rtp = true,
};
@ -706,7 +706,7 @@ static void send_handover_performed(struct gsm_subscriber_connection *conn)
ho_perf_params.chosen_encr_alg = lchan->encr.alg_id;
ho_perf_params.chosen_encr_alg_present = true;
if (ho->new_lchan->activate.requires_voice_stream) {
if (ho->new_lchan->activate.info.requires_voice_stream) {
/* Speech Version (chosen) 3.2.2.51 */
ho_perf_params.speech_version_chosen = gsm0808_permitted_speech(lchan->type, lchan->tch_mode);
ho_perf_params.speech_version_chosen_present = true;
@ -1010,7 +1010,7 @@ static void ho_fsm_post_lchan_established(struct osmo_fsm_inst *fi)
struct gsm_subscriber_connection *conn = ho_fi_conn(fi);
struct handover *ho = &conn->ho;
if (ho->new_lchan->activate.requires_voice_stream
if (ho->new_lchan->activate.info.requires_voice_stream
&& (ho->scope & HO_INTER_BSC_IN))
ho_fsm_state_chg(HO_ST_WAIT_MGW_ENDPOINT_TO_MSC);
else

142
src/osmo-bsc/lchan_fsm.c
View File

@ -151,7 +151,7 @@ static void lchan_on_fully_established(struct gsm_lchan *lchan)
return;
lchan->activate.concluded = true;
switch (lchan->activate.activ_for) {
switch (lchan->activate.info.activ_for) {
case FOR_MS_CHANNEL_REQUEST:
/* No signalling to do here, MS is free to use the channel, and should go on to connect
* to the MSC and establish a subscriber connection. */
@ -201,7 +201,7 @@ static void lchan_on_fully_established(struct gsm_lchan *lchan)
default:
LOG_LCHAN(lchan, LOGL_NOTICE, "lchan %s fully established\n",
lchan_activate_mode_name(lchan->activate.activ_for));
lchan_activate_mode_name(lchan->activate.info.activ_for));
break;
}
}
@ -238,7 +238,7 @@ struct state_timeout lchan_fsm_timeouts[32] = {
lchan_set_last_error(_lchan, "lchan %s in state %s: " fmt, \
_lchan->activate.concluded ? "failure" : "allocation failed", \
osmo_fsm_state_name(fsm, state_was), ## args); \
lchan_on_activation_failure(_lchan, _lchan->activate.activ_for, _lchan->conn); \
lchan_on_activation_failure(_lchan, _lchan->activate.info.activ_for, _lchan->conn); \
if (fi->state != state_chg) \
lchan_fsm_state_chg(state_chg); \
else \
@ -495,8 +495,6 @@ static void lchan_fsm_unused(struct osmo_fsm_inst *fi, uint32_t event, void *dat
{
struct lchan_activate_info *info = data;
struct gsm_lchan *lchan = lchan_fi_lchan(fi);
struct gsm_bts *bts = lchan->ts->trx->bts;
struct gsm48_multi_rate_conf mr_conf;
switch (event) {
@ -507,63 +505,8 @@ static void lchan_fsm_unused(struct osmo_fsm_inst *fi, uint32_t event, void *dat
lchan_set_last_error(lchan, NULL);
lchan->release.requested = false;
lchan->conn = info->for_conn;
lchan->activate.activ_for = info->activ_for;
lchan->activate.requires_voice_stream = info->requires_voice_stream;
lchan->activate.wait_before_switching_rtp = info->wait_before_switching_rtp;
lchan->activate.msc_assigned_cic = info->msc_assigned_cic;
lchan->activate.info = *info;
lchan->activate.concluded = false;
lchan->activate.re_use_mgw_endpoint_from_lchan = info->old_lchan;
if (info->old_lchan)
lchan->encr = info->old_lchan->encr;
else {
lchan->encr = (struct gsm_encr){
.alg_id = RSL_ENC_ALG_A5(0), /* no encryption */
};
}
/* If there is a previous lchan, and the new lchan is on the same cell as previous one,
* take over power and TA values. Otherwise, use max power and zero TA. */
if (info->old_lchan && info->old_lchan->ts->trx->bts == bts) {
lchan->ms_power = info->old_lchan->ms_power;
lchan->bs_power = info->old_lchan->bs_power;
lchan->rqd_ta = info->old_lchan->rqd_ta;
} else {
lchan->ms_power = ms_pwr_ctl_lvl(bts->band, bts->ms_max_power);
/* From lchan_reset():
* - bs_power is still zero, 0dB reduction, output power = Pn.
* - TA is still zero, to be determined by RACH. */
}
if (info->chan_mode == GSM48_CMODE_SPEECH_AMR) {
gsm48_mr_cfg_from_gsm0808_sc_cfg(&mr_conf, info->s15_s0);
if (lchan_mr_config(lchan, &mr_conf) < 0) {
lchan_fail("Can not generate multirate configuration IE\n");
return;
}
}
switch (info->chan_mode) {
case GSM48_CMODE_SIGN:
lchan->rsl_cmode = RSL_CMOD_SPD_SIGN;
lchan->tch_mode = GSM48_CMODE_SIGN;
break;
case GSM48_CMODE_SPEECH_V1:
case GSM48_CMODE_SPEECH_EFR:
case GSM48_CMODE_SPEECH_AMR:
lchan->rsl_cmode = RSL_CMOD_SPD_SPEECH;
lchan->tch_mode = info->chan_mode;
break;
default:
lchan_fail("Not implemented: cannot activate for chan mode %s",
gsm48_chan_mode_name(info->chan_mode));
return;
}
lchan_fsm_state_chg(LCHAN_ST_WAIT_TS_READY);
break;
@ -575,18 +518,75 @@ static void lchan_fsm_unused(struct osmo_fsm_inst *fi, uint32_t event, void *dat
static void lchan_fsm_wait_ts_ready_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state)
{
struct gsm_lchan *lchan = lchan_fi_lchan(fi);
struct mgwep_ci *use_mgwep_ci = lchan_use_mgw_endpoint_ci_bts(lchan);
struct gsm48_multi_rate_conf mr_conf;
struct gsm_bts *bts = lchan->ts->trx->bts;
struct mgwep_ci *use_mgwep_ci;
struct gsm_lchan *old_lchan = lchan->activate.info.re_use_mgw_endpoint_from_lchan;
struct lchan_activate_info *info = &lchan->activate.info;
if (lchan->release.requested) {
lchan_fail("Release requested while activating");
return;
}
lchan->conn = info->for_conn;
if (old_lchan)
lchan->encr = old_lchan->encr;
else {
lchan->encr = (struct gsm_encr){
.alg_id = RSL_ENC_ALG_A5(0), /* no encryption */
};
}
/* If there is a previous lchan, and the new lchan is on the same cell as previous one,
* take over power and TA values. Otherwise, use max power and zero TA. */
if (old_lchan && old_lchan->ts->trx->bts == bts) {
lchan->ms_power = old_lchan->ms_power;
lchan->bs_power = old_lchan->bs_power;
lchan->rqd_ta = old_lchan->rqd_ta;
} else {
lchan->ms_power = ms_pwr_ctl_lvl(bts->band, bts->ms_max_power);
/* From lchan_reset():
* - bs_power is still zero, 0dB reduction, output power = Pn.
* - TA is still zero, to be determined by RACH. */
}
if (info->chan_mode == GSM48_CMODE_SPEECH_AMR) {
gsm48_mr_cfg_from_gsm0808_sc_cfg(&mr_conf, info->s15_s0);
if (lchan_mr_config(lchan, &mr_conf) < 0) {
lchan_fail("Can not generate multirate configuration IE\n");
return;
}
}
switch (info->chan_mode) {
case GSM48_CMODE_SIGN:
lchan->rsl_cmode = RSL_CMOD_SPD_SIGN;
lchan->tch_mode = GSM48_CMODE_SIGN;
break;
case GSM48_CMODE_SPEECH_V1:
case GSM48_CMODE_SPEECH_EFR:
case GSM48_CMODE_SPEECH_AMR:
lchan->rsl_cmode = RSL_CMOD_SPD_SPEECH;
lchan->tch_mode = info->chan_mode;
break;
default:
lchan_fail("Not implemented: cannot activate for chan mode %s",
gsm48_chan_mode_name(info->chan_mode));
return;
}
use_mgwep_ci = lchan_use_mgw_endpoint_ci_bts(lchan);
LOG_LCHAN(lchan, LOGL_INFO,
"Activation requested: %s voice=%s MGW-ci=%s type=%s tch-mode=%s\n",
lchan_activate_mode_name(lchan->activate.activ_for),
lchan->activate.requires_voice_stream ? "yes" : "no",
lchan->activate.requires_voice_stream ?
lchan_activate_mode_name(lchan->activate.info.activ_for),
lchan->activate.info.requires_voice_stream ? "yes" : "no",
lchan->activate.info.requires_voice_stream ?
(use_mgwep_ci ? mgwep_ci_name(use_mgwep_ci) : "new")
: "none",
gsm_lchant_name(lchan->type),
@ -597,7 +597,7 @@ static void lchan_fsm_wait_ts_ready_onenter(struct osmo_fsm_inst *fi, uint32_t p
osmo_fsm_inst_dispatch(lchan->ts->fi, TS_EV_LCHAN_REQUESTED, lchan);
/* Prepare an MGW endpoint CI if appropriate. */
if (lchan->activate.requires_voice_stream)
if (lchan->activate.info.requires_voice_stream)
lchan_rtp_fsm_start(lchan);
}
@ -641,7 +641,7 @@ static void lchan_fsm_wait_activ_ack_onenter(struct osmo_fsm_inst *fi, uint32_t
return;
}
switch (lchan->activate.activ_for) {
switch (lchan->activate.info.activ_for) {
case FOR_MS_CHANNEL_REQUEST:
act_type = RSL_ACT_INTRA_IMM_ASS;
break;
@ -723,7 +723,7 @@ static void lchan_fsm_post_activ_ack(struct osmo_fsm_inst *fi)
return;
}
switch (lchan->activate.activ_for) {
switch (lchan->activate.info.activ_for) {
case FOR_MS_CHANNEL_REQUEST:
rc = rsl_tx_imm_assignment(lchan);
@ -778,7 +778,7 @@ static void lchan_fsm_post_activ_ack(struct osmo_fsm_inst *fi)
default:
LOG_LCHAN(lchan, LOGL_NOTICE, "lchan %s is now active\n",
lchan_activate_mode_name(lchan->activate.activ_for));
lchan_activate_mode_name(lchan->activate.info.activ_for));
break;
}
@ -798,7 +798,7 @@ static void lchan_fsm_wait_rll_rtp_establish(struct osmo_fsm_inst *fi, uint32_t
switch (event) {
case LCHAN_EV_RLL_ESTABLISH_IND:
if (!lchan->activate.requires_voice_stream
if (!lchan->activate.info.requires_voice_stream
|| lchan_rtp_established(lchan))
lchan_fsm_state_chg(LCHAN_ST_ESTABLISHED);
return;
@ -1395,6 +1395,8 @@ void lchan_forget_conn(struct gsm_lchan *lchan)
if (!lchan)
return;
lchan->activate.info.for_conn = NULL;
conn = lchan->conn;
if (conn) {
/* Log for both lchan FSM and conn FSM to ease reading the log in case of problems */

26
src/osmo-bsc/lchan_rtp_fsm.c
View File

@ -111,9 +111,9 @@ void lchan_rtp_fsm_start(struct gsm_lchan *lchan)
/* Use old lchan only if there is an MGW endpoint present. Otherwise, on ROLLBACK, we might put
* an endpoint "back" to an lchan that never had one to begin with. */
if (lchan->activate.re_use_mgw_endpoint_from_lchan
&& !lchan->activate.re_use_mgw_endpoint_from_lchan->mgw_endpoint_ci_bts)
lchan->activate.re_use_mgw_endpoint_from_lchan = NULL;
if (lchan->activate.info.re_use_mgw_endpoint_from_lchan
&& !lchan->activate.info.re_use_mgw_endpoint_from_lchan->mgw_endpoint_ci_bts)
lchan->activate.info.re_use_mgw_endpoint_from_lchan = NULL;
lchan_rtp_fsm_state_chg(LCHAN_RTP_ST_WAIT_MGW_ENDPOINT_AVAILABLE);
}
@ -127,8 +127,8 @@ struct mgwep_ci *lchan_use_mgw_endpoint_ci_bts(struct gsm_lchan *lchan)
return lchan->mgw_endpoint_ci_bts;
if (lchan_state_is(lchan, LCHAN_ST_ESTABLISHED))
return NULL;
if (lchan->activate.re_use_mgw_endpoint_from_lchan)
return lchan->activate.re_use_mgw_endpoint_from_lchan->mgw_endpoint_ci_bts;
if (lchan->activate.info.re_use_mgw_endpoint_from_lchan)
return lchan->activate.info.re_use_mgw_endpoint_from_lchan->mgw_endpoint_ci_bts;
return NULL;
}
@ -147,7 +147,7 @@ static void lchan_rtp_fsm_wait_mgw_endpoint_available_onenter(struct osmo_fsm_in
return;
}
mgwep = gscon_ensure_mgw_endpoint(lchan->conn, lchan->activate.msc_assigned_cic);
mgwep = gscon_ensure_mgw_endpoint(lchan->conn, lchan->activate.info.msc_assigned_cic);
if (!mgwep) {
lchan_rtp_fail("Internal error: cannot obtain MGW endpoint handle for conn");
return;
@ -232,7 +232,7 @@ static void lchan_rtp_fsm_switch_rtp(struct osmo_fsm_inst *fi)
{
struct gsm_lchan *lchan = lchan_rtp_fi_lchan(fi);
if (lchan->activate.wait_before_switching_rtp) {
if (lchan->activate.info.wait_before_switching_rtp) {
LOG_LCHAN_RTP(lchan, LOGL_DEBUG,
"Waiting for an event by caller before switching RTP\n");
lchan_rtp_fsm_state_chg(LCHAN_RTP_ST_WAIT_READY_TO_SWITCH_RTP);
@ -305,7 +305,7 @@ static void lchan_rtp_fsm_wait_ipacc_crcx_ack(struct osmo_fsm_inst *fi, uint32_t
return;
case LCHAN_RTP_EV_READY_TO_SWITCH_RTP:
lchan->activate.wait_before_switching_rtp = false;
lchan->activate.info.wait_before_switching_rtp = false;
return;
case LCHAN_RTP_EV_RELEASE:
@ -365,7 +365,7 @@ static void lchan_rtp_fsm_wait_ipacc_mdcx_ack(struct osmo_fsm_inst *fi, uint32_t
return;
case LCHAN_RTP_EV_READY_TO_SWITCH_RTP:
lchan->activate.wait_before_switching_rtp = false;
lchan->activate.info.wait_before_switching_rtp = false;
return;
case LCHAN_RTP_EV_RELEASE:
@ -437,7 +437,7 @@ static void lchan_rtp_fsm_wait_mgw_endpoint_configured_onenter(struct osmo_fsm_i
uint32_t prev_state)
{
struct gsm_lchan *lchan = lchan_rtp_fi_lchan(fi);
struct gsm_lchan *old_lchan = lchan->activate.re_use_mgw_endpoint_from_lchan;
struct gsm_lchan *old_lchan = lchan->activate.info.re_use_mgw_endpoint_from_lchan;
if (lchan->release.requested) {
lchan_rtp_fail("Release requested while activating");
@ -514,7 +514,7 @@ static void lchan_rtp_fsm_ready(struct osmo_fsm_inst *fi, uint32_t event, void *
static void lchan_rtp_fsm_rollback_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state)
{
struct gsm_lchan *lchan = lchan_rtp_fi_lchan(fi);
struct gsm_lchan *old_lchan = lchan->activate.re_use_mgw_endpoint_from_lchan;
struct gsm_lchan *old_lchan = lchan->activate.info.re_use_mgw_endpoint_from_lchan;
if (!lchan->mgw_endpoint_ci_bts || !old_lchan) {
osmo_fsm_inst_term(fi, OSMO_FSM_TERM_REQUEST, 0);
@ -526,7 +526,7 @@ static void lchan_rtp_fsm_rollback_onenter(struct osmo_fsm_inst *fi, uint32_t pr
static void lchan_rtp_fsm_rollback(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
struct gsm_lchan *lchan = lchan_rtp_fi_lchan(fi);
struct gsm_lchan *old_lchan = lchan->activate.re_use_mgw_endpoint_from_lchan;
struct gsm_lchan *old_lchan = lchan->activate.info.re_use_mgw_endpoint_from_lchan;
switch (event) {
@ -560,7 +560,7 @@ static void lchan_rtp_fsm_established_onenter(struct osmo_fsm_inst *fi, uint32_t
struct gsm_lchan *lchan = lchan_rtp_fi_lchan(fi);
/* Make sure that we will not hand back the MGW endpoint to any old lchan from here on. */
lchan->activate.re_use_mgw_endpoint_from_lchan = NULL;
lchan->activate.info.re_use_mgw_endpoint_from_lchan = NULL;
}
static void lchan_rtp_fsm_established(struct osmo_fsm_inst *fi, uint32_t event, void *data)

2
src/osmo-bsc/osmo_bsc_bssap.c
View File

@ -1108,7 +1108,7 @@ enum handover_result bsc_tx_bssmap_ho_complete(struct gsm_subscriber_connection
};
/* speech_codec_chosen */
if (ho->new_lchan->activate.requires_voice_stream && gscon_is_aoip(conn)) {
if (ho->new_lchan->activate.info.requires_voice_stream && gscon_is_aoip(conn)) {
int perm_spch = gsm0808_permitted_speech(lchan->type, lchan->tch_mode);
params.speech_codec_chosen_present = true;
rc = gsm0808_speech_codec_from_chan_type(&params.speech_codec_chosen, perm_spch);