diff options
author | Andreas Eversberg <jolly@eversberg.eu> | 2013-06-16 13:26:14 +0200 |
---|---|---|
committer | Harald Welte <laforge@gnumonks.org> | 2015-09-22 16:39:04 +0200 |
commit | 75caaf294980e258b63d300284f9b7bf26fd35c9 (patch) | |
tree | f9604f00187fdca2648fa9a51d8f9c16933d5700 /src/osmo-bts-sysmo/oml.c | |
parent | 5027e122a885eab21772706d39915464c887150d (diff) |
sysmobts: Clean up transitions for lchan cipher state
There are three transitions:
1. LCHAN_CIPH_NONE -> LCHAN_CIPH_RX_REQ -> LCHAN_CIPH_RX_CONF
It is used to enable ciphering in RX (uplink) direction only.
2. LCHAN_CIPH_RX_CONF -> LCHAN_CIPH_RX_CONF_TX_REQ -> LCHAN_CIPH_RXTX_CONF
It is used to additionally enable ciphering in TX (downlink) direction.
3. LCHAN_CIPH_NONE -> LCHAN_CIPH_RXTX_REQ -> LCHAN_CIPH_RX_CONF_TX_REQ
-> LCHAN_CIPH_RXTX_CONF
It is used to enable ciphering in both TX and RX directions. This is used
when the channel is activated with encryption already enabled. (assignment
or handover)
In order to follow the order of these transitions, the RX direction must
always be set before the TX direction.
If no cipher key is set (A5/0), ciphering is set to ALG 0, but lchan cipher
state remains at LCHAN_CIPH_NONE.
Diffstat (limited to 'src/osmo-bts-sysmo/oml.c')
-rw-r--r-- | src/osmo-bts-sysmo/oml.c | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/src/osmo-bts-sysmo/oml.c b/src/osmo-bts-sysmo/oml.c index 8c701642..c5810898 100644 --- a/src/osmo-bts-sysmo/oml.c +++ b/src/osmo-bts-sysmo/oml.c @@ -1004,8 +1004,12 @@ static int sapi_activate_cb(struct gsm_lchan *lchan, int status) mph_info_chan_confirm(lchan, PRIM_INFO_ACTIVATE, 0); /* set the initial ciphering parameters for both directions */ - l1if_set_ciphering(fl1h, lchan, 0); l1if_set_ciphering(fl1h, lchan, 1); + l1if_set_ciphering(fl1h, lchan, 0); + if (lchan->encr.alg_id) + lchan->ciph_state = LCHAN_CIPH_RXTX_REQ; + else + lchan->ciph_state = LCHAN_CIPH_NONE; return 0; } @@ -1154,9 +1158,16 @@ static int chmod_modif_compl_cb(struct gsm_bts_trx *trx, struct msgb *l1_msg, LOGPC(DL1C, LOGL_INFO, "RX_REQ -> RX_CONF\n"); lchan->ciph_state = LCHAN_CIPH_RX_CONF; break; - case LCHAN_CIPH_TXRX_REQ: - LOGPC(DL1C, LOGL_INFO, "TX_REQ -> TX_CONF\n"); - lchan->ciph_state = LCHAN_CIPH_TXRX_CONF; + case LCHAN_CIPH_RX_CONF_TX_REQ: + LOGPC(DL1C, LOGL_INFO, "RX_CONF_TX_REQ -> RXTX_CONF\n"); + lchan->ciph_state = LCHAN_CIPH_RXTX_CONF; + break; + case LCHAN_CIPH_RXTX_REQ: + LOGPC(DL1C, LOGL_INFO, "RXTX_REQ -> RX_CONF_TX_REQ\n"); + lchan->ciph_state = LCHAN_CIPH_RX_CONF_TX_REQ; + break; + case LCHAN_CIPH_NONE: + LOGPC(DL1C, LOGL_INFO, "\n"); break; default: LOGPC(DL1C, LOGL_INFO, "unhandled state %u\n", lchan->ciph_state); |