ss7: Split asp and xua_server into their own files
This allows having a clearer picture of the several entities involved, as well as simplifying the files. In the future, we can do the same for AS, route, etc. and leave osmo_ss7 for the "instance" object. Change-Id: I3d43268459d61b0b9f9bec34bf31dc0851fa5e48
This commit is contained in:
parent
08cb70e158
commit
0937875983
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@ -31,7 +31,8 @@ libosmo_sigtran_la_SOURCES = sccp_sap.c sua.c m3ua.c xua_msg.c sccp_helpers.c \
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sccp2sua.c sccp_scrc.c sccp_sclc.c sccp_scoc.c \
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sccp_user.c sccp_types.c sccp_lbcs.c sccp_scmg.c \
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xua_rkm.c xua_shared.c xua_default_lm_fsm.c \
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osmo_ss7.c osmo_ss7_hmrt.c xua_asp_fsm.c xua_as_fsm.c \
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osmo_ss7.c osmo_ss7_asp.c osmo_ss7_hmrt.c osmo_ss7_xua_srv.c \
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xua_asp_fsm.c xua_as_fsm.c \
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xua_snm.c osmo_ss7_vty.c sccp_vty.c ipa.c
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libosmo_sigtran_la_LDFLAGS = -version-info $(LIBVERSION) -no-undefined -export-symbols-regex '^osmo_'
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libosmo_sigtran_la_LIBADD = $(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) $(LIBOSMOVTY_LIBS) \
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1452
src/osmo_ss7.c
1452
src/osmo_ss7.c
File diff suppressed because it is too large
Load Diff
File diff suppressed because it is too large
Load Diff
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@ -0,0 +1,300 @@
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/* Core SS7 xUA Server */
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/* (C) 2015-2017 by Harald Welte <laforge@gnumonks.org>
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* (C) 2023 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
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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 <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <inttypes.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <netinet/sctp.h>
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#include <osmocom/sigtran/osmo_ss7.h>
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#include <osmocom/sigtran/mtp_sap.h>
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#include <osmocom/sigtran/protocol/mtp.h>
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#include <osmocom/sigtran/protocol/sua.h>
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#include <osmocom/sigtran/protocol/m3ua.h>
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#include <osmocom/core/linuxlist.h>
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#include <osmocom/core/select.h>
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#include <osmocom/core/utils.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/core/logging.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/socket.h>
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#include <osmocom/core/sockaddr_str.h>
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#include <osmocom/netif/stream.h>
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#include <osmocom/netif/ipa.h>
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#include <osmocom/netif/sctp.h>
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#include "sccp_internal.h"
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#include "xua_internal.h"
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#include "ss7_internal.h"
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#include "xua_asp_fsm.h"
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#include "xua_as_fsm.h"
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/***********************************************************************
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* SS7 xUA Server
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***********************************************************************/
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/* server has accept()ed a new SCTP association, let's find the ASP for
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* it (if any) */
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static int xua_accept_cb(struct osmo_stream_srv_link *link, int fd)
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{
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struct osmo_xua_server *oxs = osmo_stream_srv_link_get_data(link);
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struct osmo_stream_srv *srv;
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struct osmo_ss7_asp *asp;
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char *sock_name = osmo_sock_get_name(link, fd);
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const char *proto_name = get_value_string(osmo_ss7_asp_protocol_vals, oxs->cfg.proto);
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int rc = 0;
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LOGP(DLSS7, LOGL_INFO, "%s: New %s connection accepted\n", sock_name, proto_name);
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if (oxs->cfg.proto == OSMO_SS7_ASP_PROT_IPA) {
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srv = osmo_stream_srv_create(oxs, link, fd,
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ss7_asp_ipa_srv_conn_cb,
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ss7_asp_xua_srv_conn_closed_cb, NULL);
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} else {
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srv = osmo_stream_srv_create(oxs, link, fd,
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ss7_asp_xua_srv_conn_cb,
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ss7_asp_xua_srv_conn_closed_cb, NULL);
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}
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if (!srv) {
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LOGP(DLSS7, LOGL_ERROR, "%s: Unable to create stream server "
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"for connection\n", sock_name);
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close(fd);
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talloc_free(sock_name);
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return -1;
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}
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asp = ss7_asp_find_by_socket_addr(fd);
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if (asp) {
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LOGP(DLSS7, LOGL_INFO, "%s: matched connection to ASP %s\n",
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sock_name, asp->cfg.name);
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/* we need to check if we already have a socket associated, and close it. Otherwise it might
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* happen that both the listen-fd for this accept() and the old socket are marked 'readable'
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* during the same scheduling interval, and we're processing them in the "wrong" order, i.e.
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* we first see the accept of the new fd before we see the close on the old fd */
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if (asp->server) {
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LOGPASP(asp, DLSS7, LOGL_FATAL, "accept of new connection from %s before old was closed "
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"-> close old one\n", sock_name);
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osmo_stream_srv_set_data(asp->server, NULL);
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osmo_stream_srv_destroy(asp->server);
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asp->server = NULL;
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}
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} else {
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if (!oxs->cfg.accept_dyn_reg) {
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LOGP(DLSS7, LOGL_NOTICE, "%s: %s connection without matching "
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"ASP definition and no dynamic registration enabled, terminating\n",
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sock_name, proto_name);
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} else {
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char namebuf[32];
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static uint32_t dyn_asp_num = 0;
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snprintf(namebuf, sizeof(namebuf), "asp-dyn-%u", dyn_asp_num++);
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asp = osmo_ss7_asp_find_or_create(oxs->inst, namebuf, 0, 0,
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oxs->cfg.proto);
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if (asp) {
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char hostbuf[INET6_ADDRSTRLEN];
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const char *hostbuf_ptr = &hostbuf[0];
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char portbuf[16];
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osmo_sock_get_ip_and_port(fd, hostbuf, sizeof(hostbuf), portbuf, sizeof(portbuf), false);
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LOGP(DLSS7, LOGL_INFO, "%s: created dynamic ASP %s\n",
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sock_name, asp->cfg.name);
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asp->cfg.is_server = true;
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asp->cfg.role = OSMO_SS7_ASP_ROLE_SG;
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asp->cfg.local.port = oxs->cfg.local.port;
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asp->cfg.remote.port = atoi(portbuf);
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asp->dyn_allocated = true;
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asp->server = srv;
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osmo_ss7_asp_peer_set_hosts(&asp->cfg.local, asp,
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(const char * const*)oxs->cfg.local.host,
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oxs->cfg.local.host_cnt);
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osmo_ss7_asp_peer_set_hosts(&asp->cfg.remote, asp,
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&hostbuf_ptr, 1);
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osmo_ss7_asp_restart(asp);
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}
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}
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if (!asp) {
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osmo_stream_srv_destroy(srv);
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talloc_free(sock_name);
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return -1;
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}
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llist_add_tail(&asp->siblings, &oxs->asp_list);
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}
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/* update the ASP reference back to the server over which the
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* connection came in */
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asp->server = srv;
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asp->xua_server = oxs;
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/* update the ASP socket name */
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talloc_free(asp->sock_name);
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asp->sock_name = talloc_reparent(link, asp, sock_name);
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osmo_stream_srv_set_name(asp->server, asp->cfg.name);
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/* make sure the conn_cb() is called with the asp as private
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* data */
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osmo_stream_srv_set_data(srv, asp);
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if (oxs->cfg.proto != OSMO_SS7_ASP_PROT_IPA) {
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rc = ss7_asp_apply_peer_primary_address(asp);
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rc = ss7_asp_apply_primary_address(asp);
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}
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/* send M-SCTP_ESTABLISH.ind to Layer Manager */
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osmo_fsm_inst_dispatch(asp->fi, XUA_ASP_E_SCTP_EST_IND, 0);
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xua_asp_send_xlm_prim_simple(asp, OSMO_XLM_PRIM_M_SCTP_ESTABLISH, PRIM_OP_INDICATION);
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return rc;
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}
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/*! \brief create a new xUA server configured with given ip/port
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* \param[in] ctx talloc allocation context
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* \param[in] proto protocol (xUA variant) to use
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* \param[in] local_port local SCTP port to bind/listen to
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* \param[in] local_host local IP address to bind/listen to (optional)
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* \returns callee-allocated \ref osmo_xua_server in case of success
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*/
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struct osmo_xua_server *
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osmo_ss7_xua_server_create(struct osmo_ss7_instance *inst, enum osmo_ss7_asp_protocol proto,
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uint16_t local_port, const char *local_host)
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{
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struct osmo_xua_server *oxs = talloc_zero(inst, struct osmo_xua_server);
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OSMO_ASSERT(ss7_initialized);
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if (!oxs)
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return NULL;
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LOGP(DLSS7, LOGL_INFO, "Creating %s Server %s:%u\n",
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get_value_string(osmo_ss7_asp_protocol_vals, proto), local_host, local_port);
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INIT_LLIST_HEAD(&oxs->asp_list);
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oxs->cfg.proto = proto;
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oxs->cfg.local.port = local_port;
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oxs->server = osmo_stream_srv_link_create(oxs);
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osmo_stream_srv_link_set_name(oxs->server, osmo_ss7_asp_protocol_name(proto));
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osmo_stream_srv_link_set_data(oxs->server, oxs);
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osmo_stream_srv_link_set_accept_cb(oxs->server, xua_accept_cb);
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osmo_stream_srv_link_set_nodelay(oxs->server, true);
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osmo_stream_srv_link_set_port(oxs->server, oxs->cfg.local.port);
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osmo_stream_srv_link_set_proto(oxs->server, ss7_asp_proto_to_ip_proto(proto));
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osmo_ss7_xua_server_set_local_host(oxs, local_host);
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LOGP(DLSS7, LOGL_INFO, "Created %s server on %s:%" PRIu16 "\n",
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get_value_string(osmo_ss7_asp_protocol_vals, proto), local_host, local_port);
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oxs->inst = inst;
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llist_add_tail(&oxs->list, &inst->xua_servers);
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/* The SUA code internally needs SCCP to work */
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if (proto == OSMO_SS7_ASP_PROT_SUA)
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osmo_ss7_ensure_sccp(inst);
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return oxs;
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}
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/*! \brief Set the xUA server to bind/listen to the currently configured ip/port
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* \param[in] xs xUA server to operate
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* \returns 0 on success, negative value on error.
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*/
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int
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osmo_ss7_xua_server_bind(struct osmo_xua_server *xs)
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{
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char buf[512];
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int rc;
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const char *proto = get_value_string(osmo_ss7_asp_protocol_vals, xs->cfg.proto);
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rc = osmo_ss7_asp_peer_snprintf(buf, sizeof(buf), &xs->cfg.local);
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if (rc < 0) {
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LOGP(DLSS7, LOGL_INFO, "Failed parsing %s Server osmo_ss7_asp_peer\n", proto);
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} else {
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LOGP(DLSS7, LOGL_INFO, "(Re)binding %s Server to %s\n",
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proto, buf);
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}
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return osmo_stream_srv_link_open(xs->server);
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}
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int
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osmo_ss7_xua_server_set_local_host(struct osmo_xua_server *xs, const char *local_host)
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{
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return osmo_ss7_xua_server_set_local_hosts(xs, &local_host, 1);
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}
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int
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osmo_ss7_xua_server_set_local_hosts(struct osmo_xua_server *xs, const char **local_hosts, size_t local_host_cnt)
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{
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int rc;
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OSMO_ASSERT(ss7_initialized);
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rc = osmo_ss7_asp_peer_set_hosts(&xs->cfg.local, xs, local_hosts, local_host_cnt);
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if (rc < 0)
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return rc;
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return osmo_stream_srv_link_set_addrs(xs->server, (const char **)xs->cfg.local.host, xs->cfg.local.host_cnt);
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}
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int
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osmo_ss7_xua_server_add_local_host(struct osmo_xua_server *xs, const char *local_host)
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{
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int rc;
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rc = osmo_ss7_asp_peer_add_host(&xs->cfg.local, xs, local_host);
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if (rc < 0)
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return rc;
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return osmo_stream_srv_link_set_addrs(xs->server, (const char **)xs->cfg.local.host, xs->cfg.local.host_cnt);
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}
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bool ss7_xua_server_set_default_local_hosts(struct osmo_xua_server *oxs)
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{
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/* If no local addr was set, or erased after _create(): */
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if (!oxs->cfg.local.host_cnt) {
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/* "::" Covers both IPv4 and IPv6 */
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if (ss7_ipv6_sctp_supported("::", true))
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osmo_ss7_xua_server_set_local_host(oxs, "::");
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else
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osmo_ss7_xua_server_set_local_host(oxs, "0.0.0.0");
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return true;
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}
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return false;
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}
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void osmo_ss7_xua_server_destroy(struct osmo_xua_server *xs)
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{
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struct osmo_ss7_asp *asp, *asp2;
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if (xs->server) {
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osmo_stream_srv_link_close(xs->server);
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osmo_stream_srv_link_destroy(xs->server);
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}
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/* iterate and close all connections established in relation
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* with this server */
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llist_for_each_entry_safe(asp, asp2, &xs->asp_list, siblings)
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osmo_ss7_asp_destroy(asp);
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llist_del(&xs->list);
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talloc_free(xs);
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}
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@ -5,10 +5,31 @@
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#include <stdbool.h>
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#include <osmocom/sigtran/osmo_ss7.h>
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extern bool ss7_initialized;
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bool ss7_ipv6_sctp_supported(const char *host, bool bind);
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struct osmo_ss7_asp *ss7_asp_alloc(struct osmo_ss7_instance *inst, const char *name,
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uint16_t remote_port, uint16_t local_port,
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enum osmo_ss7_asp_protocol proto);
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bool ss7_asp_set_default_peer_hosts(struct osmo_ss7_asp *asp);
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struct osmo_ss7_asp *ss7_asp_find_by_socket_addr(int fd);
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int ss7_asp_proto_to_ip_proto(enum osmo_ss7_asp_protocol proto);
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int ss7_asp_ipa_srv_conn_cb(struct osmo_stream_srv *conn);
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int ss7_asp_xua_srv_conn_cb(struct osmo_stream_srv *conn);
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int ss7_asp_xua_srv_conn_closed_cb(struct osmo_stream_srv *srv);
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int ss7_asp_apply_peer_primary_address(const struct osmo_ss7_asp *asp);
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int ss7_asp_apply_primary_address(const struct osmo_ss7_asp *asp);
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bool ss7_xua_server_set_default_local_hosts(struct osmo_xua_server *oxs);
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enum ss7_as_ctr {
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SS7_AS_CTR_RX_MSU_TOTAL,
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SS7_AS_CTR_TX_MSU_TOTAL,
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};
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enum ss7_asp_ctr {
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SS7_ASP_CTR_PKT_RX_TOTAL,
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SS7_ASP_CTR_PKT_RX_UNKNOWN,
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SS7_ASP_CTR_PKT_TX_TOTAL,
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};
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