105 lines
3.6 KiB
C
105 lines
3.6 KiB
C
/* Shared code between M3UA and SUA implementation */
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/* (C) 2015-2021 by Harald Welte <laforge@gnumonks.org>
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* All Rights Reserved
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*
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* SPDX-License-Identifier: GPL-2.0+
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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 General Public License as published by
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* the Free Software Foundation; either version 2 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 General Public License for more details.
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*
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* You should have received a copy of the GNU 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 <stdint.h>
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#include <unistd.h>
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#include <string.h>
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#include <osmocom/core/utils.h>
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#include <osmocom/core/linuxlist.h>
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#include <osmocom/core/logging.h>
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#include <osmocom/sigtran/xua_msg.h>
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#include <osmocom/sigtran/osmo_ss7.h>
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#include <osmocom/sigtran/protocol/m3ua.h>
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#include <osmocom/sigtran/protocol/sua.h>
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#include "xua_internal.h"
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/* if given ASP only has one AS, return that AS */
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static struct osmo_ss7_as *find_single_as_for_asp(const struct osmo_ss7_asp *asp)
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{
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struct osmo_ss7_as *as, *as_found = NULL;
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llist_for_each_entry(as, &asp->inst->as_list, list) {
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if (!osmo_ss7_as_has_asp(as, asp))
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continue;
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/* check if we already had found another AS within this ASP -> not unique */
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if (as_found)
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return NULL;
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as_found = as;
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}
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return as_found;
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}
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/* this is why we can use the M3UA constants below in a function shared between M3UA + SUA */
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osmo_static_assert(M3UA_ERR_INVAL_ROUT_CTX == SUA_ERR_INVAL_ROUT_CTX, _err_rctx);
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osmo_static_assert(M3UA_ERR_NO_CONFGD_AS_FOR_ASP == SUA_ERR_NO_CONFGD_AS_FOR_ASP, _err_as_for_asp);
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/*! Find the AS for given ASP + optional routing context IE.
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* if rctx_ie == NULL, we assume that this ASP is only part of a single AS;
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* if rctx_ie is given, then we look-up the ASP based on the routing context,
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* and verify that this ASP is part of it.
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* \param[out] as caller-provided address-of-pointer to store the found AS
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* \param[in] asp ASP for which we want to look-up the AS
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* \param[in] rctx_ie routing context IE (may be NULL) to use for look-up
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* \returns 0 in case of success; {M3UA,SUA}_ERR_* code in case of error. */
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int xua_find_as_for_asp(struct osmo_ss7_as **as, const struct osmo_ss7_asp *asp,
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const struct xua_msg_part *rctx_ie)
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{
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int log_ss = osmo_ss7_asp_get_log_subsys(asp);
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*as = NULL;
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if (rctx_ie) {
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uint32_t rctx = xua_msg_part_get_u32(rctx_ie);
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/* Use routing context IE to look up the AS for which the
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* message was received. */
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*as = osmo_ss7_as_find_by_rctx(asp->inst, rctx);
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if (!*as) {
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LOGPASP(asp, log_ss, LOGL_ERROR, "%s(): invalid routing context: %u\n",
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__func__, rctx);
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return M3UA_ERR_INVAL_ROUT_CTX;
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}
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/* Verify that this ASP is part of the AS. */
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if (!osmo_ss7_as_has_asp(*as, asp)) {
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LOGPASP(asp, log_ss, LOGL_ERROR,
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"%s(): This Application Server Process is not part of the AS %s "
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"resolved by routing context %u\n", __func__, (*as)->cfg.name, rctx);
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return M3UA_ERR_NO_CONFGD_AS_FOR_ASP;
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}
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} else {
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/* no explicit routing context; this only works if there is only one AS in the ASP */
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*as = find_single_as_for_asp(asp);
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if (!*as) {
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LOGPASP(asp, log_ss, LOGL_ERROR,
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"%s(): ASP sent M3UA without Routing Context IE but unable to uniquely "
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"identify the AS for this message\n", __func__);
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return M3UA_ERR_INVAL_ROUT_CTX;
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}
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}
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return 0;
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}
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