diff options
| author | Harald Welte <laforge@gnumonks.org> | 2011-07-07 18:16:35 +0200 |
|---|---|---|
| committer | Harald Welte <laforge@gnumonks.org> | 2011-07-07 18:16:35 +0200 |
| commit | be598e3afd04e2f0b773ca89e3a5b5d229a97797 (patch) | |
| tree | f762cce691b75d472c48a5f263a20cf3fa8909fa | |
| parent | 540410c123d439a03f672726d64f6a6aec45a98d (diff) | |
RSL: Send fake CIPHERING MODE COMPLETE
we do this as a hack as long as the MSC assumes the BTS supports
A5, but the L1 really doesn't support it yet.
| -rw-r--r-- | src/common/rsl.c | 34 |
1 files changed, 33 insertions, 1 deletions
diff --git a/src/common/rsl.c b/src/common/rsl.c index a32c48a..fa73295 100644 --- a/src/common/rsl.c +++ b/src/common/rsl.c @@ -41,6 +41,8 @@ #include <osmo-bts/bts_model.h> #include <osmo-bts/measurement.h> +#define FAKE_CIPH_MODE_COMPL + static int rsl_tx_error_report(struct gsm_bts_trx *trx, uint8_t cause); /* list of RSL SI types that can occur on the SACCH */ @@ -645,6 +647,30 @@ static int rsl_rx_rf_chan_rel(struct msgb *msg) return rc; } +#ifdef FAKE_CIPH_MODE_COMPL +/* ugly hack to send a fake CIPH MODE COMPLETE back to the BSC */ +#include <osmocom/gsm/protocol/gsm_04_08.h> +static int tx_ciph_mod_compl_hack(struct gsm_lchan *lchan, uint8_t link_id) +{ + struct msgb *fake_msg = rsl_msgb_alloc(128); + struct gsm48_hdr *g48h; + + /* generate 04.08 RR message */ + g48h = (struct gsm48_hdr *) msgb_put(fake_msg, sizeof(*g48h)); + g48h->proto_discr = GSM48_PDISC_RR; + g48h->msg_type = GSM48_MT_RR_CIPH_M_COMPL; + + rsl_rll_push_l3(fake_msg, RSL_MT_DATA_IND, gsm_lchan2chan_nr(lchan), + link_id, 1); + + fake_msg->lchan = lchan; + fake_msg->trx = lchan->ts->trx; + + /* send it back to the BTS */ + return abis_rsl_sendmsg(fake_msg); +} +#endif + /* 8.4.6 ENCRYPTION COMMAND */ static int rsl_rx_encr_cmd(struct msgb *msg) { @@ -683,11 +709,17 @@ static int rsl_rx_encr_cmd(struct msgb *msg) /* push a fake RLL DATA REQ header */ rsl_rll_push_l3(msg, RSL_MT_DATA_REQ, dch->chan_nr, link_id, 1); - LOGP(DRSL, LOGL_INFO, "%s Fwd RSL ENCR CMD (Alg %u) to LAPDm\n", +#ifdef FAKE_CIPH_MODE_COMPL + LOGP(DRSL, LOGL_NOTICE, "%s Sending FAKE CIPHERING MODE COMPLETE to BSC\n", gsm_lchan_name(lchan), lchan->encr.alg_id); + return tx_ciph_mod_compl_hack(lchan, link_id); +#else + LOGP(DRSL, LOGL_INFO, "%s Fwd RSL ENCR CMD (Alg %u) to LAPDm\n", + gsm_lchan_name(lchan), lchan->encr.alg_id); /* hand it into RSLms for transmission of L3_INFO to the MS */ return lapdm_rslms_recvmsg(msg, &lchan->lapdm_ch); +#endif } /* 8.4.20 SACCH INFO MODify */ |