neels has submitted this change. (
https://gerrit.osmocom.org/c/osmo-bsc/+/24677 )
Change subject: dissolve gsm0808_cipher_mode() into bssmap_handle_cipher_mode()
......................................................................
dissolve gsm0808_cipher_mode() into bssmap_handle_cipher_mode()
An upcoming patch for A5/4 would need to add a kc128 arg and reject
cause rc to gsm0808_cipher_mode(). Instead prepare for less cruft by
just having a single function.
Related: SYS#5324
Change-Id: I7f7c635943990a251ae28ae7a0d69cc3a239a154
---
M src/osmo-bsc/osmo_bsc_bssap.c
1 file changed, 25 insertions(+), 32 deletions(-)
Approvals:
Jenkins Builder: Verified
fixeria: Looks good to me, approved
pespin: Looks good to me, but someone else must approve
laforge: Looks good to me, but someone else must approve
diff --git a/src/osmo-bsc/osmo_bsc_bssap.c b/src/osmo-bsc/osmo_bsc_bssap.c
index 563a957..9177e6b 100644
--- a/src/osmo-bsc/osmo_bsc_bssap.c
+++ b/src/osmo-bsc/osmo_bsc_bssap.c
@@ -416,34 +416,6 @@
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);
-}
-
static int bssmap_handle_clear_cmd(struct gsm_subscriber_connection *conn,
struct msgb *msg, unsigned int length)
{
@@ -553,13 +525,34 @@
goto reject;
}
- /* To complete the confusion, gsm0808_cipher_mode again expects the
encryption as a number
- * from 0 to 7. */
- if (gsm0808_cipher_mode(conn, chosen_cipher, enc_key, enc_key_len,
- include_imeisv)) {
+ if (chosen_cipher > 0 && !enc_key_len) {
+ LOGP(DRSL, LOGL_ERROR, "%s: Need to have an encryption key.\n",
+ bsc_subscr_name(conn->bsub));
reject_cause = GSM0808_CAUSE_PROTOCOL_ERROR_BETWEEN_BSS_AND_MSC;
goto reject;
}
+
+ if (enc_key_len > MAX_A5_KEY_LEN) {
+ LOGP(DRSL, LOGL_ERROR, "%s: The key is too long: %d\n",
+ bsc_subscr_name(conn->bsub), len);
+ reject_cause = GSM0808_CAUSE_PROTOCOL_ERROR_BETWEEN_BSS_AND_MSC;
+ goto reject;
+ }
+
+ conn->lchan->encr.alg_id = RSL_ENC_ALG_A5(chosen_cipher);
+ if (enc_key_len) {
+ conn->lchan->encr.key_len = enc_key_len;
+ memcpy(conn->lchan->encr.key, enc_key, enc_key_len);
+ }
+
+ LOGP(DRSL, LOGL_DEBUG, "(subscr %s) Cipher Mode: cipher=%d key=%s
include_imeisv=%d\n",
+ bsc_subscr_name(conn->bsub), chosen_cipher,
osmo_hexdump_nospc(enc_key, enc_key_len),
+ include_imeisv);
+
+ if (gsm48_send_rr_ciph_mode(conn->lchan, include_imeisv) < 0) {
+ reject_cause = GSM0808_CAUSE_RADIO_INTERFACE_FAILURE;
+ goto reject;
+ }
return 0;
reject:
--
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Gerrit-Project: osmo-bsc
Gerrit-Branch: master
Gerrit-Change-Id: I7f7c635943990a251ae28ae7a0d69cc3a239a154
Gerrit-Change-Number: 24677
Gerrit-PatchSet: 2
Gerrit-Owner: neels <nhofm...@sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: fixeria <vyanits...@sysmocom.de>
Gerrit-Reviewer: laforge <lafo...@osmocom.org>
Gerrit-Reviewer: neels <nhofm...@sysmocom.de>
Gerrit-Reviewer: pespin <pes...@sysmocom.de>
Gerrit-MessageType: merged
