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