move openbsc/* to repos root

This is the first step in creating this repository from the legacy openbsc.git.

Like all other Osmocom repositories, keep the autoconf and automake files in
the repository root. openbsc.git has been the sole exception, which ends now.

Change-Id: I9c6f2a448d9cb1cc088cf1cf6918b69d7e69b4e7

1 files changed, 119 insertions, 0 deletions

diff --git a/src/osmo-bsc_nat/bsc_nat_filter.c b/src/osmo-bsc_nat/bsc_nat_filter.c
new file mode 100644
index 000000000..e73529097
--- /dev/null
+++ b/src/osmo-bsc_nat/bsc_nat_filter.c
@@ -0,0 +1,119 @@
+/*
+ * (C) 2010-2015 by Holger Hans Peter Freyther <zecke@selfish.org>
+ * (C) 2010-2012 by On-Waves
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <openbsc/bsc_nat.h>
+#include <openbsc/bsc_nat_sccp.h>
+#include <openbsc/bsc_msg_filter.h>
+#include <openbsc/debug.h>
+
+#include <osmocom/gsm/gsm0808.h>
+
+#include <osmocom/gsm/protocol/gsm_08_08.h>
+#include <osmocom/gsm/protocol/gsm_04_11.h>
+
+#include <osmocom/sccp/sccp.h>
+
+/* Filter out CR data... */
+int bsc_nat_filter_sccp_cr(struct bsc_connection *bsc, struct msgb *msg,
+			struct bsc_nat_parsed *parsed, int *con_type,
+			char **imsi, struct bsc_filter_reject_cause *cause)
+{
+	struct bsc_filter_request req;
+	struct tlv_parsed tp;
+	struct gsm48_hdr *hdr48;
+	int hdr48_len;
+	int len;
+
+	*con_type = FLT_CON_TYPE_NONE;
+	cause->cm_reject_cause = GSM48_REJECT_PLMN_NOT_ALLOWED;
+	cause->lu_reject_cause = GSM48_REJECT_PLMN_NOT_ALLOWED;
+	*imsi = NULL;
+
+	if (parsed->gsm_type != BSS_MAP_MSG_COMPLETE_LAYER_3) {
+		LOGP(DNAT, LOGL_ERROR,
+		     "Rejecting CR message due wrong GSM Type %d\n", parsed->gsm_type);
+		return -1;
+	}
+
+	/* the parsed has had some basic l3 length check */
+	len = msg->l3h[1];
+	if (msgb_l3len(msg) - 3 < len) {
+		LOGP(DNAT, LOGL_ERROR,
+		     "The CR Data has not enough space...\n");
+		return -1;
+	}
+
+	msg->l4h = &msg->l3h[3];
+	len -= 1;
+
+	tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l4h, len, 0, 0);
+
+	if (!TLVP_PRESENT(&tp, GSM0808_IE_LAYER_3_INFORMATION)) {
+		LOGP(DNAT, LOGL_ERROR, "CR Data does not contain layer3 information.\n");
+		return -1;
+	}
+
+	hdr48_len = TLVP_LEN(&tp, GSM0808_IE_LAYER_3_INFORMATION);
+
+	if (hdr48_len < sizeof(*hdr48)) {
+		LOGP(DNAT, LOGL_ERROR, "GSM48 header does not fit.\n");
+		return -1;
+	}
+
+	hdr48 = (struct gsm48_hdr *) TLVP_VAL(&tp, GSM0808_IE_LAYER_3_INFORMATION);
+	req.ctx = bsc;
+	req.black_list = &bsc->nat->imsi_black_list;
+	req.access_lists = &bsc->nat->access_lists;
+	req.local_lst_name = bsc->cfg->acc_lst_name;
+	req.global_lst_name = bsc->nat->acc_lst_name;
+	req.bsc_nr = bsc->cfg->nr;
+	return bsc_msg_filter_initial(hdr48, hdr48_len, &req, con_type, imsi, cause);
+}
+
+int bsc_nat_filter_dt(struct bsc_connection *bsc, struct msgb *msg,
+		struct nat_sccp_connection *con, struct bsc_nat_parsed *parsed,
+		struct bsc_filter_reject_cause *cause)
+{
+	uint32_t len;
+	struct gsm48_hdr *hdr48;
+	struct bsc_filter_request req;
+
+	cause->cm_reject_cause = GSM48_REJECT_PLMN_NOT_ALLOWED;
+	cause->lu_reject_cause = GSM48_REJECT_PLMN_NOT_ALLOWED;
+
+	if (con->filter_state.imsi_checked)
+		return 0;
+
+	/* only care about DTAP messages */
+	if (parsed->bssap != BSSAP_MSG_DTAP)
+		return 0;
+
+	hdr48 = bsc_unpack_dtap(parsed, msg, &len);
+	if (!hdr48)
+		return -1;
+
+	req.ctx = con;
+	req.black_list = &bsc->nat->imsi_black_list;
+	req.access_lists = &bsc->nat->access_lists;
+	req.local_lst_name = bsc->cfg->acc_lst_name;
+	req.global_lst_name = bsc->nat->acc_lst_name;
+	req.bsc_nr = bsc->cfg->nr;
+	return bsc_msg_filter_data(hdr48, len, &req, &con->filter_state, cause);
+}