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dyn PDCH: add lchan sanity checks in PDCH DE/ACT ACK

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Change-Id: I0456cfb88860823c37c14688673e9cbc8d0085d8
This commit is contained in:
Neels Hofmeyr
2016-06-13 12:28:21 +02:00
parent 3201988f7b
commit 285df2ec62
1 changed files with 54 additions and 0 deletions
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54
openbsc/src/libbsc/abis_rsl.c
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@@ -1201,8 +1201,59 @@ static int rsl_rx_hando_det(struct msgb *msg)
return 0;
}
static bool lchan_may_change_pdch(struct gsm_lchan *lchan, bool pdch_act)
{
struct gsm_bts_trx_ts *ts;
bool ok;
OSMO_ASSERT(lchan);
ts = lchan->ts;
OSMO_ASSERT(ts);
OSMO_ASSERT(ts->trx);
OSMO_ASSERT(ts->trx->bts);
if (lchan->ts->pchan != GSM_PCHAN_TCH_F_PDCH) {
LOGP(DRSL, LOGL_ERROR, "(bts %u, trx %u, ts %u, pchan %s)"
" Rx PDCH %s ACK for channel that is no TCH/F_PDCH\n",
ts->trx->bts->nr, ts->trx->nr, ts->nr,
gsm_pchan_name(ts->pchan),
pdch_act? "ACT" : "DEACT");
return false;
}
/* During BTS initialization, we expect to PDCH ACT in channel state ==
* NONE. However, during dynamic channel switching, we will PDCH ACT
* while in state DEACTIVATION REQUESTED (we're deactivating TCH/F
* while activating PDCH); and we will PDCH DEACT while in state
* ACTIVATION REQUESTED (we're activating TCH/F while deactivating
* PDCH). */
/* FIXME: rather switch PDCH while in state NONE, i.e. after
* deactivation of TCH/F and before activation of TCH/F? */
if (pdch_act)
ok = (lchan->state == LCHAN_S_NONE
|| lchan->state == LCHAN_S_REL_REQ);
else
ok = (lchan->state == LCHAN_S_NONE
|| lchan->state == LCHAN_S_ACT_REQ);
if (!ok) {
LOGP(DRSL, LOGL_ERROR, "(bts %u, trx %u, ts %u, pchan %s)"
" Rx PDCH %s ACK in unexpected state: %s\n",
ts->trx->bts->nr, ts->trx->nr, ts->nr,
gsm_pchan_name(ts->pchan),
pdch_act? "ACT" : "DEACT",
gsm_lchans_name(lchan->state));
return false;
}
return true;
}
static int rsl_rx_pdch_act_ack(struct msgb *msg)
{
if (!lchan_may_change_pdch(msg->lchan, true))
return -EINVAL;
msg->lchan->ts->flags |= TS_F_PDCH_ACTIVE;
msg->lchan->ts->flags &= ~TS_F_PDCH_ACT_PENDING;
@@ -1214,6 +1265,9 @@ static int rsl_rx_pdch_act_ack(struct msgb *msg)
static int rsl_rx_pdch_deact_ack(struct msgb *msg)
{
if (!lchan_may_change_pdch(msg->lchan, false))
return -EINVAL;
msg->lchan->ts->flags &= ~TS_F_PDCH_ACTIVE;
msg->lchan->ts->flags &= ~TS_F_PDCH_DEACT_PENDING;