diff options
| author | Vadim Yanitskiy <axilirator@gmail.com> | 2018-05-11 05:11:44 +0700 |
|---|---|---|
| committer | Vadim Yanitskiy <axilirator@gmail.com> | 2018-10-03 18:43:07 +0700 |
| commit | 33c61fb11bd9fd6341365e1c355db445bd626fb3 (patch) | |
| tree | e7eb2d7b65cb7e7fb3f94d54087d25e9f876b98c /src/host/layer23/src/mobile/gsm48_rr.c | |
| parent | ff38b29d2ef1a7a48be6541b4053e36e7fd2fdf5 (diff) | |
mobile/gsm48_rr.c: properly handle CHANNEL MODE MODIFY
According to 3GPP TS 04.08, section 3.4.6.1.3 "Abnormal cases"
of "channel mode modify procedure", if the MS doesn't support
the indicated channel mode, it shall retain the old mode and
return the associated channel mode information in the
ACKNOWLEDGE message.
Previously, if an indicated mode is not supported, we used to
indicate the 'CHAN_MODE_UNACCT' RR case without sending the
ACKNOWLEDGE message. Also, the result of gsm48_rr_set_mode()
was ignored. Let's fix this!
Change-Id: I952436ec796273e56341f9d3492b4a3b3a5dc410
Diffstat (limited to 'src/host/layer23/src/mobile/gsm48_rr.c')
| -rw-r--r-- | src/host/layer23/src/mobile/gsm48_rr.c | 30 |
1 files changed, 23 insertions, 7 deletions
diff --git a/src/host/layer23/src/mobile/gsm48_rr.c b/src/host/layer23/src/mobile/gsm48_rr.c index c8fb057c..b00674d4 100644 --- a/src/host/layer23/src/mobile/gsm48_rr.c +++ b/src/host/layer23/src/mobile/gsm48_rr.c @@ -3569,7 +3569,7 @@ static int gsm48_rr_rx_chan_modify(struct osmocom_ms *ms, struct msgb *msg) int payload_len = msgb_l3len(msg) - sizeof(*gh) - sizeof(*cm); struct gsm48_rr_cd *cd = &rr->cd_now; uint8_t ch_type, ch_subch, ch_ts; - uint8_t cause; + int rc; LOGP(DRR, LOGL_INFO, "CHANNEL MODE MODIFY\n"); @@ -3601,14 +3601,30 @@ static int gsm48_rr_rx_chan_modify(struct osmocom_ms *ms, struct msgb *msg) gsm_print_arfcn(cd->arfcn), ch_ts, ch_subch, cd->tsc, cm->mode); } - /* mode */ - cause = gsm48_rr_check_mode(ms, cd->chan_nr, cm->mode); - if (cause) - return gsm48_rr_tx_rr_status(ms, cause); + + /** + * According to 3GPP TS 04.08, section 3.4.6.1.3 + * "Abnormal cases" of "channel mode modify procedure", + * if the MS doesn't support the indicated channel mode, + * it shall retain the old mode and return the associated + * channel mode information in the ACKNOWLEDGE message. + */ + + /* Check if we support this channel mode */ + rc = gsm48_rr_check_mode(ms, cd->chan_nr, cm->mode); + if (rc) + goto ack; + + /* Attempt to apply this mode */ + rc = gsm48_rr_set_mode(ms, cd->chan_nr, cm->mode); + if (rc) + goto ack; + + /* Finally set (a new) mode */ cd->mode = cm->mode; - gsm48_rr_set_mode(ms, cd->chan_nr, cd->mode); - return gsm48_rr_tx_chan_modify_ack(ms, &cm->chan_desc, cm->mode); +ack: + return gsm48_rr_tx_chan_modify_ack(ms, &cm->chan_desc, cd->mode); } /* 9.1.3 sending ASSIGNMENT COMPLETE */ |