add struct bsc_subscr, separating libbsc from gsm_subscriber

In a future commit, gsm_subscriber will be replaced by vlr_subscr, and it will
not make sense to use vlr_subscr in libbsc. Thus we need a dedicated BSC
subscriber: struct bsc_subscr.

Add rf_policy arg to bsc_grace_paging_request() because the bsc_subscr will no
longer have a backpointer to gsm_network (used to be via subscr->group).

Create a separate logging filter for the new BSC subscriber. The implementation
of adjusting the filter context is added in libbsc to not introduce
bsc_subscr_get/_put() dependencies to libcommon.

During Paging Response, fetch a bsc_subscr from the mobile identity, like we do
for the gsm_subscriber. It looks like a duplication now, but will make sense
for the VLR as well as for future MSC split patches.

Naming: it was requested to not name the new struct bsc_sub, because 'sub' is
too ambiguous. At the same time it would be fine to have 'bsc_sub_' as function
prefix. Instead of struct bsc_subscriber and bsc_sub_ prefix, I decided to
match both up as struct bsc_subscr and bsc_subscr_ function prefix. It's fast
to type, relatively short, unambiguous, and the naming is consistent.

Add bsc_subscr unit test.

Related: OS#1592, OS#1594
Change-Id: Ia61cc00e8bb186b976939a4fc8f7cf9ce6aa3d8e

1 files changed, 9 insertions, 3 deletions

diff --git a/openbsc/src/libcommon/debug.c b/openbsc/src/libcommon/debug.c
index 4d7bfed68..0f8221198 100644
--- a/openbsc/src/libcommon/debug.c
+++ b/openbsc/src/libcommon/debug.c
@@ -180,6 +180,7 @@ static const struct log_info_cat default_categories[] = {
 static int filter_fn(const struct log_context *ctx, struct log_target *tar)
 {
 	const struct gsm_subscriber *subscr = ctx->ctx[LOG_CTX_VLR_SUBSCR];
+	const struct bsc_subscr *bsub = ctx->ctx[LOG_CTX_BSC_SUBSCR];
 	const struct gprs_nsvc *nsvc = ctx->ctx[LOG_CTX_GB_NSVC];
 	const struct gprs_nsvc *bvc = ctx->ctx[LOG_CTX_GB_BVC];
 
@@ -187,6 +188,10 @@ static int filter_fn(const struct log_context *ctx, struct log_target *tar)
 	    && subscr && subscr == tar->filter_data[LOG_FLT_VLR_SUBSCR])
 		return 1;
 
+	if ((tar->filter_map & (1 << LOG_FLT_BSC_SUBSCR)) != 0
+	    && bsub && bsub == tar->filter_data[LOG_FLT_BSC_SUBSCR])
+		return 1;
+
 	/* Filter on the NS Virtual Connection */
 	if ((tar->filter_map & (1 << LOG_FLT_GB_NSVC)) != 0
 	    && nsvc && (nsvc == tar->filter_data[LOG_FLT_GB_NSVC]))
@@ -206,7 +211,8 @@ const struct log_info log_info = {
 	.num_cat = ARRAY_SIZE(default_categories),
 };
 
-void log_set_imsi_filter(struct log_target *target, struct gsm_subscriber *subscr)
+void log_set_filter_vlr_subscr(struct log_target *target,
+			       struct gsm_subscriber *vlr_subscr)
 {
 	struct gsm_subscriber **fsub = (void*)&target->filter_data[LOG_FLT_VLR_SUBSCR];
 
@@ -216,9 +222,9 @@ void log_set_imsi_filter(struct log_target *target, struct gsm_subscriber *subsc
 		*fsub = NULL;
 	}
 
-	if (subscr) {
+	if (vlr_subscr) {
 		target->filter_map |= (1 << LOG_FLT_VLR_SUBSCR);
-		*fsub = subscr_get(subscr);
+		*fsub = subscr_get(vlr_subscr);
 	} else
 		target->filter_map &= ~(1 << LOG_FLT_VLR_SUBSCR);
 }