diff options
Diffstat (limited to 'src/common/l1sap.c')
| -rw-r--r-- | src/common/l1sap.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/common/l1sap.c b/src/common/l1sap.c index c899914f..80560348 100644 --- a/src/common/l1sap.c +++ b/src/common/l1sap.c @@ -113,6 +113,7 @@ static int l1sap_tx_ciph_req(struct gsm_bts_trx *trx, uint8_t chan_nr, static int check_for_ciph_cmd(struct msgb *msg, struct gsm_lchan *lchan, uint8_t chan_nr) { + uint8_t n_s; /* only do this if we are in the right state */ switch (lchan->ciph_state) { @@ -133,11 +134,22 @@ static int check_for_ciph_cmd(struct msgb *msg, struct gsm_lchan *lchan, if ((msg->data[4] & 0x3F) != GSM48_MT_RR_CIPH_M_CMD) return 0; + /* Remember N(S) + 1 to find the first ciphered frame */ + n_s = (msg->data[1] >> 1) & 0x7; + lchan->ciph_ns = (n_s + 1) % 8; + l1sap_tx_ciph_req(lchan->ts->trx, chan_nr, 0, 1); return 1; } +/* public helpers for the test */ +int bts_check_for_ciph_cmd(struct msgb *msg, struct gsm_lchan *lchan, + uint8_t chan_nr) +{ + return check_for_ciph_cmd(msg, lchan, chan_nr); +} + struct gsmtap_inst *gsmtap = NULL; uint32_t gsmtap_sapi_mask = 0; uint8_t gsmtap_sapi_acch = 0; |