1 files changed, 107 insertions, 0 deletions
diff --git a/openbsc/include/openbsc/bsc_msg_filter.h b/openbsc/include/openbsc/bsc_msg_filter.h
new file mode 100644
index 000000000..a9dedf43c
--- /dev/null
+++ b/openbsc/include/openbsc/bsc_msg_filter.h
@@ -0,0 +1,107 @@
+#pragma once
+
+#include <osmocom/core/msgb.h>
+#include <osmocom/core/msgfile.h>
+#include <osmocom/core/linuxrbtree.h>
+#include <osmocom/core/linuxlist.h>
+
+#include <regex.h>
+
+struct vty;
+struct gsm48_hdr;
+
+struct bsc_filter_reject_cause {
+	int lu_reject_cause;
+	int cm_reject_cause;
+};
+
+struct bsc_filter_barr_entry {
+	struct rb_node node;
+
+	char *imsi;
+	int cm_reject_cause;
+	int lu_reject_cause;
+};
+
+enum bsc_filter_acc_ctr {
+	ACC_LIST_LOCAL_FILTER,
+	ACC_LIST_GLOBAL_FILTER,
+};
+
+struct bsc_msg_acc_lst {
+	struct llist_head list;
+
+	/* counter */
+	struct rate_ctr_group *stats;
+
+	/* the name of the list */
+	const char *name;
+	struct llist_head fltr_list;
+};
+
+struct bsc_msg_acc_lst_entry {
+	struct llist_head list;
+
+	/* the filter */
+	char *imsi_allow;
+	regex_t imsi_allow_re;
+	char *imsi_deny;
+	regex_t imsi_deny_re;
+
+	/* reject reasons for the access lists */
+	int cm_reject_cause;
+	int lu_reject_cause;
+};
+
+enum {
+	FLT_CON_TYPE_NONE,
+	FLT_CON_TYPE_LU,
+	FLT_CON_TYPE_CM_SERV_REQ,
+	FLT_CON_TYPE_PAG_RESP,
+	FLT_CON_TYPE_SSA,
+	FLT_CON_TYPE_LOCAL_REJECT,
+	FLT_CON_TYPE_OTHER,
+};
+
+
+struct bsc_filter_state {
+	char *imsi;
+	int imsi_checked;
+	int con_type;
+};
+
+struct bsc_filter_request {
+	void *ctx;
+	struct rb_root *black_list;
+	struct llist_head *access_lists;
+	const char *local_lst_name;
+	const char *global_lst_name;
+	int bsc_nr;
+};
+
+
+int bsc_filter_barr_adapt(void *ctx, struct rb_root *rbtree, const struct osmo_config_list *);
+int bsc_filter_barr_find(struct rb_root *root, const char *imsi, int *cm, int *lu);
+
+/**
+ * Content filtering.
+ */
+int bsc_msg_filter_initial(struct gsm48_hdr *hdr, size_t size,
+			struct bsc_filter_request *req,
+			int *con_type, char **imsi,
+			struct bsc_filter_reject_cause *cause);
+int bsc_msg_filter_data(struct gsm48_hdr *hdr, size_t size,
+			struct bsc_filter_request *req,
+			struct bsc_filter_state *state,
+			struct bsc_filter_reject_cause *cause);
+
+/* IMSI allow/deny handling */
+struct bsc_msg_acc_lst *bsc_msg_acc_lst_find(struct llist_head *lst, const char *name);
+struct bsc_msg_acc_lst *bsc_msg_acc_lst_get(void *ctx, struct llist_head *lst, const char *name);
+void bsc_msg_acc_lst_delete(struct bsc_msg_acc_lst *lst);
+
+struct bsc_msg_acc_lst_entry *bsc_msg_acc_lst_entry_create(struct bsc_msg_acc_lst *);
+int bsc_msg_acc_lst_check_allow(struct bsc_msg_acc_lst *lst, const char *imsi);
+
+void bsc_msg_lst_vty_init(void *ctx, struct llist_head *lst, int node);
+void bsc_msg_acc_lst_write(struct vty *vty, struct bsc_msg_acc_lst *lst);