gbproxy: Parse Attach Reject messages
That message is currently ignored but should invalidate the TLLI and
de-register the logical link instead.
This patch extends the parser to recognize such messages and to set
the invalidate_tlli flag.
Sponsored-by: On-Waves ehf
diff --git a/openbsc/src/gprs/gprs_gb_parse.c b/openbsc/src/gprs/gprs_gb_parse.c
index 2baaa06..a0a4469 100644
--- a/openbsc/src/gprs/gprs_gb_parse.c
+++ b/openbsc/src/gprs/gprs_gb_parse.c
@@ -219,6 +219,23 @@
return 1;
}
+static int gprs_gb_parse_gmm_attach_rej(uint8_t *data, size_t data_len,
+ struct gprs_gb_parse_context *parse_ctx)
+{
+ uint8_t *value;
+
+ parse_ctx->llc_msg_name = "ATTACH_REJ";
+
+ /* GMM cause */
+ if (v_fixed_shift(&data, &data_len, 1, &value) <= 0)
+ return 0;
+
+ parse_ctx->invalidate_tlli = 1;
+
+ return 1;
+}
+
+
static int gprs_gb_parse_gmm_detach_req(uint8_t *data, size_t data_len,
struct gprs_gb_parse_context *parse_ctx)
{
@@ -442,6 +459,9 @@
case GSM48_MT_GMM_ATTACH_REQ:
return gprs_gb_parse_gmm_attach_req(data, data_len, parse_ctx);
+ case GSM48_MT_GMM_ATTACH_REJ:
+ return gprs_gb_parse_gmm_attach_rej(data, data_len, parse_ctx);
+
case GSM48_MT_GMM_ATTACH_ACK:
return gprs_gb_parse_gmm_attach_ack(data, data_len, parse_ctx);