Support forwarding messages with multiple BSCs

Implement a proper subscriber connection mapping. Create a new
subscr_conn when one of the stored BSCs sends a conn.ind and use that
subscr_conn for all related connection-oriented messages with the same
RAN-side conn_id to send messages back and forth between BSC and MSC.

Add subscr_conn_get_next_id based on OsmoBSC's
bsc_sccp_inst_next_conn_id.

With this patch, it's possible to do a successful Location Updating
procedure between MS2 and MSC in the following network:

  MS1 --- BTS1 --- BSC1 --.
                          BSCNAT --- MSC
  MS2 --- BTS2 --- BSC2 --'

Related: SYS#5560
Change-Id: I1556aa665fbb0a97507f98794e74820731fa6935
master
Oliver Smith 9 months ago
parent 1968ca922b
commit 499e1117a6
  1. 4
      doc/examples/osmo-bsc-nat/osmo-bsc-nat.cfg
  2. 1
      include/osmocom/bsc_nat/Makefile.am
  3. 1
      include/osmocom/bsc_nat/bsc.h
  4. 3
      include/osmocom/bsc_nat/bsc_nat.h
  5. 1
      include/osmocom/bsc_nat/msc.h
  6. 43
      include/osmocom/bsc_nat/subscr_conn.h
  7. 1
      src/osmo-bsc-nat/Makefile.am
  8. 12
      src/osmo-bsc-nat/bsc.c
  9. 8
      src/osmo-bsc-nat/bsc_nat.c
  10. 156
      src/osmo-bsc-nat/bsc_nat_fsm.c
  11. 12
      src/osmo-bsc-nat/msc.c
  12. 99
      src/osmo-bsc-nat/subscr_conn.c

@ -13,10 +13,6 @@ cs7 instance 1
asp asp-clnt-OsmoBSCNAT-RAN 2905 0 m3ua
remote-ip 127.0.0.2
local-ip 127.0.0.4
sccp-address bsc
routing-indicator PC
point-code 0.23.3
subsystem-number 254
bsc-nat
cs7-instance-cn 0

@ -5,5 +5,6 @@ noinst_HEADERS = \
bssap.h \
logging.h \
msc.h \
subscr_conn.h \
vty.h \
$(NULL)

@ -29,3 +29,4 @@ struct bsc {
struct bsc *bsc_alloc(struct osmo_sccp_addr *addr);
struct bsc *bsc_get_by_pc(uint32_t pointcode);
void bsc_free(struct bsc *bsc);
void bsc_free_subscr_conn_all(struct bsc *bsc);

@ -37,14 +37,17 @@ struct bsc_nat_sccp_inst {
struct bsc_nat {
struct osmo_fsm_inst *fi;
struct llist_head subscr_conns; /* list of struct subscr_conn */
struct {
struct bsc_nat_sccp_inst *sccp_inst;
uint32_t subscr_conn_id_next;
struct llist_head mscs; /* list of struct msc */
} cn;
struct {
struct bsc_nat_sccp_inst *sccp_inst;
uint32_t subscr_conn_id_next;
struct llist_head bscs; /* list of struct bsc */
} ran;
};

@ -39,3 +39,4 @@ void msc_rx_reset_ack(struct msc *msc);
bool msc_is_connected(struct msc *msc);
void msc_free(struct msc *msc);
void msc_free_subscr_conn_all(struct msc *msc);

@ -0,0 +1,43 @@
/* (C) 2021 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
* Author: Oliver Smith <osmith@sysmocom.de>
* 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/lienses/>.
*
*/
#pragma once
/* connection for one subscriber */
struct subscr_conn {
struct llist_head list;
struct {
uint32_t id;
struct msc *msc;
} cn;
struct {
uint32_t id;
struct bsc *bsc;
} ran;
};
int subscr_conn_get_next_id(enum bsc_nat_net net);
struct subscr_conn *subscr_conn_alloc(struct msc *msc, struct bsc *bsc, uint32_t id_cn, uint32_t id_ran);
struct subscr_conn *subscr_conn_get_by_id(uint32_t id, enum bsc_nat_net net);
void subscr_conn_free(struct subscr_conn *subscr_conn);

@ -33,6 +33,7 @@ osmo_bsc_nat_SOURCES = \
main.c \
msc.c \
msc_fsm.c \
subscr_conn.c \
vty.c \
$(NULL)

@ -21,6 +21,7 @@
#include <osmocom/bsc_nat/bsc.h>
#include <osmocom/bsc_nat/bsc_nat.h>
#include <osmocom/bsc_nat/logging.h>
#include <osmocom/bsc_nat/subscr_conn.h>
struct bsc *bsc_alloc(struct osmo_sccp_addr *addr)
{
@ -51,9 +52,20 @@ struct bsc *bsc_get_by_pc(uint32_t pointcode)
return NULL;
}
void bsc_free_subscr_conn_all(struct bsc *bsc)
{
struct subscr_conn *subscr_conn;
llist_for_each_entry(subscr_conn, &g_bsc_nat->subscr_conns, list) {
if (subscr_conn->ran.bsc == bsc)
subscr_conn_free(subscr_conn);
}
}
void bsc_free(struct bsc *bsc)
{
LOGP(DMAIN, LOGL_DEBUG, "Del %s\n", talloc_get_name(bsc));
bsc_free_subscr_conn_all(bsc);
llist_del(&bsc->list);
talloc_free(bsc);
}

@ -18,6 +18,7 @@
*/
#include "config.h"
#include <inttypes.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/utils.h>
#include <osmocom/bsc_nat/bsc.h>
@ -25,6 +26,7 @@
#include <osmocom/bsc_nat/bsc_nat_fsm.h>
#include <osmocom/bsc_nat/logging.h>
#include <osmocom/bsc_nat/msc.h>
#include <osmocom/bsc_nat/subscr_conn.h>
struct bsc_nat *bsc_nat_alloc(void *tall_ctx)
{
@ -41,6 +43,7 @@ struct bsc_nat *bsc_nat_alloc(void *tall_ctx)
OSMO_ASSERT(bsc_nat->ran.sccp_inst);
talloc_set_name_const(bsc_nat->ran.sccp_inst, "struct bsc_nat_sccp_inst (RAN)");
INIT_LLIST_HEAD(&bsc_nat->subscr_conns);
INIT_LLIST_HEAD(&bsc_nat->cn.mscs);
INIT_LLIST_HEAD(&bsc_nat->ran.bscs);
@ -51,6 +54,7 @@ struct bsc_nat *bsc_nat_alloc(void *tall_ctx)
void bsc_nat_free(struct bsc_nat *bsc_nat)
{
struct subscr_conn *subscr_conn, *s;
struct msc *msc, *m;
struct bsc *bsc, *b;
@ -59,6 +63,10 @@ void bsc_nat_free(struct bsc_nat *bsc_nat)
bsc_nat->fi = NULL;
}
llist_for_each_entry_safe(subscr_conn, s, &bsc_nat->subscr_conns, list) {
subscr_conn_free(subscr_conn);
}
llist_for_each_entry_safe(msc, m, &bsc_nat->cn.mscs, list) {
msc_free(msc);
}

@ -19,17 +19,20 @@
#include "config.h"
#include <errno.h>
#include <inttypes.h>
#include <stdint.h>
#include <osmocom/core/fsm.h>
#include <osmocom/core/select.h>
#include <osmocom/gsm/gsm0808.h>
#include <osmocom/sigtran/osmo_ss7.h>
#include <osmocom/sigtran/sccp_helpers.h>
#include <osmocom/bsc_nat/bsc.h>
#include <osmocom/bsc_nat/bsc_nat.h>
#include <osmocom/bsc_nat/bsc_nat_fsm.h>
#include <osmocom/bsc_nat/bssap.h>
#include <osmocom/bsc_nat/logging.h>
#include <osmocom/bsc_nat/msc.h>
#include <osmocom/bsc_nat/subscr_conn.h>
#define DEFAULT_PC_RAN "0.23.1" /* same as default for OsmoMSC */
#define DEFAULT_PC_CN "0.23.3" /* same as default for OsmoBSC */
@ -47,13 +50,6 @@ enum bsc_nat_fsm_events {
BSC_NAT_FSM_EV_STOP,
};
static struct bsc_nat_sccp_inst *sccp_inst_dest(struct bsc_nat_sccp_inst *src)
{
if (src == g_bsc_nat->cn.sccp_inst)
return g_bsc_nat->ran.sccp_inst;
return g_bsc_nat->cn.sccp_inst;
}
/* For connection-oriented messages, figure out which side is not the BSCNAT,
* either the called_addr or calling_addr. */
static int sccp_sap_get_peer_addr_in(struct bsc_nat_sccp_inst *src, struct osmo_sccp_addr **peer_addr_in,
@ -79,37 +75,13 @@ static int sccp_sap_get_peer_addr_in(struct bsc_nat_sccp_inst *src, struct osmo_
return -1;
}
/* Figure out who will receive the message.
* For now this is simplified by assuming there is only one MSC, one BSC. */
static int sccp_sap_get_peer_addr_out(struct bsc_nat_sccp_inst *src, struct osmo_sccp_addr *peer_addr_in,
struct osmo_sccp_addr *peer_addr_out)
{
struct bsc_nat_sccp_inst *dest = sccp_inst_dest(src);
if (src == g_bsc_nat->ran.sccp_inst) {
if (osmo_sccp_addr_by_name_local(peer_addr_out, "msc", dest->ss7_inst) < 0) {
LOGP(DMAIN, LOGL_ERROR, "Could not find MSC in address book\n");
return -1;
}
} else {
if (osmo_sccp_addr_by_name_local(peer_addr_out, "bsc", dest->ss7_inst) < 0) {
LOGP(DMAIN, LOGL_ERROR, "Could not find BSC in address book\n");
return -2;
}
}
return 0;
}
/* Handle incoming messages from CN (MSC). For now this is simplified by
* assuming there is only one MSC, one BSC (not yet translating connection ids
* etc.). */
/* Handle incoming messages from CN (MSC) */
static int sccp_sap_up_cn(struct osmo_prim_hdr *oph, void *scu)
{
struct bsc_nat_sccp_inst *sccp_inst = osmo_sccp_user_get_priv(scu);
struct osmo_scu_prim *prim = (struct osmo_scu_prim *) oph;
struct osmo_sccp_addr *addr; /* MSC's address */
struct osmo_sccp_addr peer_addr_out;
struct subscr_conn *subscr_conn;
int rc = -1;
LOGP(DMAIN, LOGL_DEBUG, "Rx %s from CN\n", osmo_scu_prim_name(oph));
@ -117,23 +89,9 @@ static int sccp_sap_up_cn(struct osmo_prim_hdr *oph, void *scu)
switch (OSMO_PRIM_HDR(oph)) {
case OSMO_PRIM(OSMO_SCU_PRIM_N_CONNECT, PRIM_OP_INDICATION):
/* indication of new inbound connection request */
if (sccp_sap_get_peer_addr_in(sccp_inst, &addr, &prim->u.connect.called_addr,
&prim->u.connect.calling_addr) < 0)
goto error;
if (sccp_sap_get_peer_addr_out(sccp_inst, addr, &peer_addr_out) < 0)
goto error;
LOGP(DMAIN, LOGL_DEBUG, "Fwd to %s\n", bsc_nat_print_addr_ran(&peer_addr_out));
msgb_pull_to_l2(oph->msg);
osmo_sccp_tx_conn_req(g_bsc_nat->ran.sccp_inst->scu,
prim->u.connect.conn_id,
&g_bsc_nat->ran.sccp_inst->addr,
&peer_addr_out,
oph->msg->data,
msgb_length(oph->msg));
rc = 0;
/* FIXME: MSC has sent a message without conn_id, figure out to
* which BSC to forward this. */
LOGP(DMAIN, LOGL_ERROR, "%s(%s) is not implemented!\n", __func__, osmo_scu_prim_name(oph));
break;
case OSMO_PRIM(OSMO_SCU_PRIM_N_CONNECT, PRIM_OP_CONFIRM):
@ -142,15 +100,19 @@ static int sccp_sap_up_cn(struct osmo_prim_hdr *oph, void *scu)
&prim->u.connect.calling_addr) < 0)
goto error;
if (sccp_sap_get_peer_addr_out(sccp_inst, addr, &peer_addr_out) < 0)
subscr_conn = subscr_conn_get_by_id(prim->u.connect.conn_id, BSC_NAT_NET_CN);
if (!subscr_conn) {
LOGP(DMAIN, LOGL_ERROR, "Unknown conn_id=%" PRIu32 " from %s\n", prim->u.connect.conn_id,
bsc_nat_print_addr_cn(addr));
goto error;
}
LOGP(DMAIN, LOGL_DEBUG, "Fwd to %s\n", bsc_nat_print_addr_ran(&peer_addr_out));
LOGP(DMAIN, LOGL_DEBUG, "Fwd via %s\n", talloc_get_name(subscr_conn));
msgb_pull_to_l2(oph->msg);
osmo_sccp_tx_conn_resp(g_bsc_nat->ran.sccp_inst->scu,
prim->u.connect.conn_id,
&peer_addr_out,
subscr_conn->ran.id,
&subscr_conn->ran.bsc->addr,
oph->msg->data,
msgb_length(oph->msg));
rc = 0;
@ -158,14 +120,18 @@ static int sccp_sap_up_cn(struct osmo_prim_hdr *oph, void *scu)
case OSMO_PRIM(OSMO_SCU_PRIM_N_DATA, PRIM_OP_INDICATION):
/* connection-oriented data received */
if (sccp_sap_get_peer_addr_out(sccp_inst, NULL, &peer_addr_out) < 0)
subscr_conn = subscr_conn_get_by_id(prim->u.data.conn_id, BSC_NAT_NET_CN);
if (!subscr_conn) {
LOGP(DMAIN, LOGL_ERROR, "Unknown conn_id=%" PRIu32 " from %s\n", prim->u.data.conn_id,
bsc_nat_print_addr_cn(addr));
goto error;
}
LOGP(DMAIN, LOGL_DEBUG, "Fwd to %s\n", bsc_nat_print_addr_ran(&peer_addr_out));
LOGP(DMAIN, LOGL_DEBUG, "Fwd via %s\n", talloc_get_name(subscr_conn));
msgb_pull_to_l2(oph->msg);
osmo_sccp_tx_data(g_bsc_nat->ran.sccp_inst->scu,
prim->u.data.conn_id,
subscr_conn->ran.id,
oph->msg->data,
msgb_length(oph->msg));
rc = 0;
@ -173,15 +139,22 @@ static int sccp_sap_up_cn(struct osmo_prim_hdr *oph, void *scu)
case OSMO_PRIM(OSMO_SCU_PRIM_N_DISCONNECT, PRIM_OP_INDICATION):
/* indication of disconnect */
if (sccp_sap_get_peer_addr_out(sccp_inst, NULL, &peer_addr_out) < 0)
subscr_conn = subscr_conn_get_by_id(prim->u.disconnect.conn_id, BSC_NAT_NET_CN);
if (!subscr_conn) {
LOGP(DMAIN, LOGL_ERROR, "Unknown conn_id=%" PRIu32 " from %s\n", prim->u.disconnect.conn_id,
bsc_nat_print_addr_cn(addr));
goto error;
}
LOGP(DMAIN, LOGL_DEBUG, "Fwd to %s\n", bsc_nat_print_addr_ran(&peer_addr_out));
LOGP(DMAIN, LOGL_DEBUG, "Fwd via %s\n", talloc_get_name(subscr_conn));
osmo_sccp_tx_disconn(g_bsc_nat->ran.sccp_inst->scu,
prim->u.disconnect.conn_id,
&prim->u.disconnect.responding_addr,
subscr_conn->ran.id,
&g_bsc_nat->ran.sccp_inst->addr,
prim->u.disconnect.cause);
subscr_conn_free(subscr_conn);
rc = 0;
break;
@ -200,16 +173,15 @@ error:
return rc;
}
/* Handle incoming messages from RAN (BSC). For now this is simplified by
* assuming there is only one MSC, one BSC (not yet translating connection ids
* etc.). */
/* Handle incoming messages from RAN (BSC) */
static int sccp_sap_up_ran(struct osmo_prim_hdr *oph, void *scu)
{
struct bsc_nat_sccp_inst *sccp_inst = osmo_sccp_user_get_priv(scu);
struct osmo_scu_prim *prim = (struct osmo_scu_prim *) oph;
struct osmo_sccp_addr *addr; /* BSC's address */
struct osmo_sccp_addr peer_addr_out;
struct subscr_conn *subscr_conn;
struct msc *msc;
struct bsc *bsc;
int rc = -1;
LOGP(DMAIN, LOGL_DEBUG, "Rx %s from RAN\n", osmo_scu_prim_name(oph));
@ -227,16 +199,25 @@ static int sccp_sap_up_ran(struct osmo_prim_hdr *oph, void *scu)
&prim->u.connect.calling_addr) < 0)
goto error;
if (sccp_sap_get_peer_addr_out(sccp_inst, addr, &peer_addr_out) < 0)
bsc = bsc_get_by_pc(addr->pc);
if (!bsc)
bsc = bsc_alloc(addr);
if (subscr_conn_get_by_id(prim->u.connect.conn_id, BSC_NAT_NET_RAN)) {
LOGP(DMAIN, LOGL_ERROR, "%s attempted to create new connection with already used"
" conn_id=%" PRIu32 ", ignoring\n", talloc_get_name(bsc), prim->u.connect.conn_id);
goto error;
}
LOGP(DMAIN, LOGL_DEBUG, "Fwd to %s\n", bsc_nat_print_addr_cn(&peer_addr_out));
subscr_conn = subscr_conn_alloc(msc, bsc, subscr_conn_get_next_id(BSC_NAT_NET_CN), prim->u.connect.conn_id);
LOGP(DMAIN, LOGL_DEBUG, "Fwd via %s\n", talloc_get_name(subscr_conn));
msgb_pull_to_l2(oph->msg);
osmo_sccp_tx_conn_req(g_bsc_nat->cn.sccp_inst->scu,
prim->u.connect.conn_id,
subscr_conn->cn.id,
&g_bsc_nat->cn.sccp_inst->addr,
&peer_addr_out,
&subscr_conn->cn.msc->addr,
oph->msg->data,
msgb_length(oph->msg));
rc = 0;
@ -248,15 +229,19 @@ static int sccp_sap_up_ran(struct osmo_prim_hdr *oph, void *scu)
&prim->u.connect.calling_addr) < 0)
goto error;
if (sccp_sap_get_peer_addr_out(sccp_inst, addr, &peer_addr_out) < 0)
subscr_conn = subscr_conn_get_by_id(prim->u.connect.conn_id, BSC_NAT_NET_RAN);
if (!subscr_conn) {
LOGP(DMAIN, LOGL_ERROR, "Unknown conn_id=%" PRIu32 " from %s\n", prim->u.connect.conn_id,
bsc_nat_print_addr_ran(addr));
goto error;
}
LOGP(DMAIN, LOGL_DEBUG, "Fwd to %s\n", bsc_nat_print_addr_cn(&peer_addr_out));
LOGP(DMAIN, LOGL_DEBUG, "Fwd via %s\n", talloc_get_name(subscr_conn));
msgb_pull_to_l2(oph->msg);
osmo_sccp_tx_conn_resp(g_bsc_nat->cn.sccp_inst->scu,
prim->u.connect.conn_id,
&peer_addr_out,
subscr_conn->cn.id,
&subscr_conn->cn.msc->addr,
oph->msg->data,
msgb_length(oph->msg));
rc = 0;
@ -264,14 +249,18 @@ static int sccp_sap_up_ran(struct osmo_prim_hdr *oph, void *scu)
case OSMO_PRIM(OSMO_SCU_PRIM_N_DATA, PRIM_OP_INDICATION):
/* connection-oriented data received */
if (sccp_sap_get_peer_addr_out(sccp_inst, NULL, &peer_addr_out) < 0)
subscr_conn = subscr_conn_get_by_id(prim->u.data.conn_id, BSC_NAT_NET_RAN);
if (!subscr_conn) {
LOGP(DMAIN, LOGL_ERROR, "Unknown conn_id=%" PRIu32 " from %s\n", prim->u.data.conn_id,
bsc_nat_print_addr_ran(addr));
goto error;
}
LOGP(DMAIN, LOGL_DEBUG, "Fwd to %s\n", bsc_nat_print_addr_cn(&peer_addr_out));
LOGP(DMAIN, LOGL_DEBUG, "Fwd via %s\n", talloc_get_name(subscr_conn));
msgb_pull_to_l2(oph->msg);
osmo_sccp_tx_data(g_bsc_nat->cn.sccp_inst->scu,
prim->u.data.conn_id,
subscr_conn->cn.id,
oph->msg->data,
msgb_length(oph->msg));
rc = 0;
@ -279,15 +268,22 @@ static int sccp_sap_up_ran(struct osmo_prim_hdr *oph, void *scu)
case OSMO_PRIM(OSMO_SCU_PRIM_N_DISCONNECT, PRIM_OP_INDICATION):
/* indication of disconnect */
if (sccp_sap_get_peer_addr_out(sccp_inst, NULL, &peer_addr_out) < 0)
subscr_conn = subscr_conn_get_by_id(prim->u.disconnect.conn_id, BSC_NAT_NET_RAN);
if (!subscr_conn) {
LOGP(DMAIN, LOGL_ERROR, "Unknown conn_id=%" PRIu32 " from %s\n", prim->u.disconnect.conn_id,
bsc_nat_print_addr_ran(addr));
goto error;
}
LOGP(DMAIN, LOGL_DEBUG, "Fwd to %s\n", bsc_nat_print_addr_cn(&peer_addr_out));
LOGP(DMAIN, LOGL_DEBUG, "Fwd via %s\n", talloc_get_name(subscr_conn));
osmo_sccp_tx_disconn(g_bsc_nat->cn.sccp_inst->scu,
prim->u.disconnect.conn_id,
&prim->u.disconnect.responding_addr,
subscr_conn->cn.id,
&g_bsc_nat->cn.sccp_inst->addr,
prim->u.disconnect.cause);
subscr_conn_free(subscr_conn);
rc = 0;
break;

@ -22,6 +22,7 @@
#include <osmocom/bsc_nat/msc.h>
#include <osmocom/bsc_nat/bsc_nat.h>
#include <osmocom/bsc_nat/logging.h>
#include <osmocom/bsc_nat/subscr_conn.h>
extern struct osmo_fsm msc_fsm;
@ -70,9 +71,20 @@ struct msc *msc_get(void)
return llist_first_entry(&g_bsc_nat->cn.mscs, struct msc, list);
}
void msc_free_subscr_conn_all(struct msc *msc)
{
struct subscr_conn *subscr_conn;
llist_for_each_entry(subscr_conn, &g_bsc_nat->subscr_conns, list) {
if (subscr_conn->cn.msc == msc)
subscr_conn_free(subscr_conn);
}
}
void msc_free(struct msc *msc)
{
LOGP(DMAIN, LOGL_DEBUG, "Del %s\n", talloc_get_name(msc));
msc_free_subscr_conn_all(msc);
llist_del(&msc->list);
osmo_fsm_inst_free(msc->fi);
talloc_free(msc);

@ -0,0 +1,99 @@
/* (C) 2022 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
* Author: Oliver Smith <osmith@sysmocom.de>
* 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/lienses/>.
*
*/
#include "config.h"
#include <inttypes.h>
#include <osmocom/core/talloc.h>
#include <osmocom/bsc_nat/bsc.h>
#include <osmocom/bsc_nat/bsc_nat.h>
#include <osmocom/bsc_nat/msc.h>
#include <osmocom/bsc_nat/subscr_conn.h>
#include <osmocom/bsc_nat/logging.h>
/* Get the next available id in either CN or RAN. */
int subscr_conn_get_next_id(enum bsc_nat_net net)
{
uint32_t *id;
if (net == BSC_NAT_NET_RAN)
id = &g_bsc_nat->ran.subscr_conn_id_next;
else
id = &g_bsc_nat->cn.subscr_conn_id_next;
for (int i = 0; i < 0xFFFFFF; i++) {
struct subscr_conn *subscr_conn;
bool already_used = false;
*id = (*id + 1) & 0xffffff;
llist_for_each_entry(subscr_conn, &g_bsc_nat->subscr_conns, list) {
if ((net == BSC_NAT_NET_RAN && subscr_conn->ran.id == *id)
|| (net == BSC_NAT_NET_CN && subscr_conn->cn.id == *id)) {
already_used = true;
break;
}
}
if (!already_used)
return *id;
}
return -1;
}
struct subscr_conn *subscr_conn_alloc(struct msc *msc, struct bsc *bsc, uint32_t id_cn, uint32_t id_ran)
{
struct subscr_conn *subscr_conn = talloc_zero(g_bsc_nat, struct subscr_conn);
OSMO_ASSERT(subscr_conn);
talloc_set_name(subscr_conn, "SUBSCR-CONN %s:%" PRIu32 " <=> %s:%" PRIu32,
talloc_get_name(msc), id_cn,
talloc_get_name(bsc), id_ran);
LOGP(DMAIN, LOGL_DEBUG, "Add %s\n", talloc_get_name(subscr_conn));
subscr_conn->cn.id = id_cn;
subscr_conn->cn.msc = msc;
subscr_conn->ran.id = id_ran;
subscr_conn->ran.bsc = bsc;
INIT_LLIST_HEAD(&subscr_conn->list);
llist_add(&subscr_conn->list, &g_bsc_nat->subscr_conns);
return subscr_conn;
}
struct subscr_conn *subscr_conn_get_by_id(uint32_t id, enum bsc_nat_net net)
{
struct subscr_conn *subscr_conn;
llist_for_each_entry(subscr_conn, &g_bsc_nat->subscr_conns, list) {
if ((net == BSC_NAT_NET_RAN && subscr_conn->ran.id == id)
|| (net == BSC_NAT_NET_CN && subscr_conn->cn.id == id))
return subscr_conn;
}
return NULL;
}
void subscr_conn_free(struct subscr_conn *subscr_conn)
{
LOGP(DMAIN, LOGL_DEBUG, "Del %s\n", talloc_get_name(subscr_conn));
llist_del(&subscr_conn->list);
talloc_free(subscr_conn);
}
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