gbproxy: Keep tlli_info after detach
Currently a tlli_info entry is deleted when the TLLI gets invalidated
by a Detach message.
This patch introduces the possibility to keep tlli_info entries in
the list. Those entries then have cleared TLLI fields, are marked as
de-registered, and can only be retrieved by a message containing an
IMSI or a P-TMSI.
The following VTY configuration commands are added to the gbproxy
node:
- tlli-list keep-mode never : Don't keep the entries (default)
- tlli-list keep-mode re-attach : Only keep them, when a Detach
message with re-attach required has been received
- tlli-list keep-mode identified : Only keep entries which are
associated with an IMSI
- tlli-list keep-mode always : Keep all entries
Note that at least one of max-length or max-age should be set when
this feature is used to limit the number of entries.
Sponsored-by: On-Waves ehf
diff --git a/openbsc/src/gprs/gprs_gb_parse.c b/openbsc/src/gprs/gprs_gb_parse.c
index f361951..7ae792a 100644
--- a/openbsc/src/gprs/gprs_gb_parse.c
+++ b/openbsc/src/gprs/gprs_gb_parse.c
@@ -224,6 +224,7 @@
{
uint8_t *value;
size_t value_len;
+ int detach_type;
int power_off;
parse_ctx->llc_msg_name = "DETACH_REQ";
@@ -234,9 +235,14 @@
/* invalid */
return 0;
+ detach_type = *value & 0x07;
power_off = *value & 0x08 ? 1 : 0;
- if (!parse_ctx->to_bss) {
+ if (parse_ctx->to_bss) {
+ /* Network originated */
+ if (detach_type == GPRS_DET_T_MT_REATT_REQ)
+ parse_ctx->await_reattach = 1;
+ } else {
/* Mobile originated */
if (power_off)
@@ -651,6 +657,10 @@
LOGP(DGPRS, LOGL_DEBUG, "%s invalidate", sep);
sep = ",";
}
+ if (parse_ctx->await_reattach) {
+ LOGP(DGPRS, LOGL_DEBUG, "%s re-attach", sep);
+ sep = ",";
+ }
LOGP(DGPRS, LOGL_DEBUG, "\n");
}