sgsn: Create an initial and limited CDR module

This is consuming the new signals and allows to install several
different CDR/observing/event/audit modules in the future. For
getting the bytes in/out the code would have had to undo what the
rate counter is doing and at the same time adding a "total" to
the ratecounter didn't look like a good idea, the same went for
making it a plain counter.

Begin writing the values one by one and open/closing a new FILE
for every log messages. This is not efficient but easily deals
with external truncation/rotation of the file (no fstat for and
checking the links and size). As usual we will wait and see if
this is an issue.

Add some new members to our PDP context structure to see what it
is about.

1 files changed, 14 insertions, 0 deletions

diff --git a/openbsc/include/openbsc/sgsn.h b/openbsc/include/openbsc/sgsn.h
index 7d3a68c43..0f9a59f25 100644
--- a/openbsc/include/openbsc/sgsn.h
+++ b/openbsc/include/openbsc/sgsn.h
@@ -16,6 +16,11 @@ enum sgsn_auth_policy {
 	SGSN_AUTH_POLICY_REMOTE
 };
 
+struct sgsn_cdr {
+	char *filename;
+	int interval;
+};
+
 struct sgsn_config {
 	/* parsed from config file */
 
@@ -33,6 +38,9 @@ struct sgsn_config {
 
 	int require_authentication;
 	int require_update_location;
+
+	/* CDR configuration */
+	struct sgsn_cdr cdr;
 };
 
 struct sgsn_instance {
@@ -85,4 +93,10 @@ int sndcp_unitdata_req(struct msgb *msg, struct gprs_llc_lle *lle, uint8_t nsapi
 int sndcp_llunitdata_ind(struct msgb *msg, struct gprs_llc_lle *lle,
 			 uint8_t *hdr, uint16_t len);
 
+
+/*
+ * CDR related functionality
+ */
+int sgsn_cdr_init(struct sgsn_instance *sgsn);
+
 #endif