diff options
Diffstat (limited to 'src/osmo-bsc/osmo_bsc_bssap.c')
| -rw-r--r-- | src/osmo-bsc/osmo_bsc_bssap.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/src/osmo-bsc/osmo_bsc_bssap.c b/src/osmo-bsc/osmo_bsc_bssap.c index c6fbe23c8..95bad7b16 100644 --- a/src/osmo-bsc/osmo_bsc_bssap.c +++ b/src/osmo-bsc/osmo_bsc_bssap.c @@ -386,6 +386,34 @@ static int select_best_cipher(uint8_t msc_mask, uint8_t bsc_mask) return -1; } +/*! We received a GSM 08.08 CIPHER MODE from the MSC */ +static int gsm0808_cipher_mode(struct gsm_subscriber_connection *conn, int cipher, + const uint8_t *key, int len, int include_imeisv) +{ + if (cipher > 0 && key == NULL) { + LOGP(DRSL, LOGL_ERROR, "%s: Need to have an encryption key.\n", + bsc_subscr_name(conn->bsub)); + return -1; + } + + if (len > MAX_A5_KEY_LEN) { + LOGP(DRSL, LOGL_ERROR, "%s: The key is too long: %d\n", + bsc_subscr_name(conn->bsub), len); + return -1; + } + + LOGP(DRSL, LOGL_DEBUG, "(subscr %s) Cipher Mode: cipher=%d key=%s include_imeisv=%d\n", + bsc_subscr_name(conn->bsub), cipher, osmo_hexdump_nospc(key, len), include_imeisv); + + conn->lchan->encr.alg_id = RSL_ENC_ALG_A5(cipher); + if (key) { + conn->lchan->encr.key_len = len; + memcpy(conn->lchan->encr.key, key, len); + } + + return gsm48_send_rr_ciph_mode(conn->lchan, include_imeisv); +} + /* * GSM 08.08 ยง 3.4.7 cipher mode handling. We will have to pick * the cipher to be used for this. In case we are already using |