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/*
* Copyright (C) 2019 by Sukchan Lee <acetcom@gmail.com>
* Copyright (C) 2022 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
*
* This file is part of Open5GS.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "ogs-gtp.h"
#include "ogs-app.h"
typedef enum {
GTP_XACT_UNKNOWN_STAGE,
GTP_XACT_INITIAL_STAGE,
GTP_XACT_INTERMEDIATE_STAGE,
GTP_XACT_FINAL_STAGE,
} ogs_gtp_xact_stage_t;
static int ogs_gtp_xact_initialized = 0;
static uint32_t g_xact_id = 0;
static OGS_POOL(pool, ogs_gtp_xact_t);
static ogs_gtp_xact_t *ogs_gtp_xact_remote_create(ogs_gtp_node_t *gnode, uint8_t gtp_version, uint32_t sqn);
static ogs_gtp_xact_stage_t ogs_gtp2_xact_get_stage(uint8_t type, uint32_t xid);
static ogs_gtp_xact_stage_t ogs_gtp1_xact_get_stage(uint8_t type, uint32_t xid);
static int ogs_gtp_xact_delete(ogs_gtp_xact_t *xact);
static int ogs_gtp_xact_update_rx(ogs_gtp_xact_t *xact, uint8_t type);
static void response_timeout(void *data);
static void holding_timeout(void *data);
static void peer_timeout(void *data);
int ogs_gtp_xact_init(void)
{
ogs_assert(ogs_gtp_xact_initialized == 0);
ogs_pool_init(&pool, ogs_app()->pool.xact);
g_xact_id = 0;
ogs_gtp_xact_initialized = 1;
return OGS_OK;
}
void ogs_gtp_xact_final(void)
{
ogs_assert(ogs_gtp_xact_initialized == 1);
ogs_pool_final(&pool);
ogs_gtp_xact_initialized = 0;
}
ogs_gtp_xact_t *ogs_gtp1_xact_local_create(ogs_gtp_node_t *gnode,
ogs_gtp1_header_t *hdesc, ogs_pkbuf_t *pkbuf,
void (*cb)(ogs_gtp_xact_t *xact, void *data), void *data)
{
int rv;
char buf[OGS_ADDRSTRLEN];
ogs_gtp_xact_t *xact = NULL;
ogs_assert(gnode);
ogs_assert(hdesc);
ogs_pool_id_calloc(&pool, &xact);
ogs_assert(xact);
xact->index = ogs_pool_index(&pool, xact);
xact->gtp_version = 1;
xact->org = OGS_GTP_LOCAL_ORIGINATOR;
xact->xid = OGS_NEXT_ID(g_xact_id,
OGS_GTP1_MIN_XACT_ID, OGS_GTP1_MAX_XACT_ID);
xact->gnode = gnode;
xact->cb = cb;
xact->data = data;
/* 7.6 "The T3-RESPONSE timer shall be started when a signalling request
* message (for which a response has been defined) is sent." */
if (hdesc->type != OGS_GTP1_RAN_INFORMATION_RELAY_TYPE) {
xact->tm_response = ogs_timer_add(
ogs_app()->timer_mgr, response_timeout,
OGS_UINT_TO_POINTER(xact->id));
ogs_assert(xact->tm_response);
xact->response_rcount =
ogs_local_conf()->time.message.gtp.n3_response_rcount;
}
xact->tm_holding = ogs_timer_add(
ogs_app()->timer_mgr, holding_timeout,
OGS_UINT_TO_POINTER(xact->id));
ogs_assert(xact->tm_holding);
xact->holding_rcount = ogs_local_conf()->time.message.gtp.n3_holding_rcount;
ogs_list_add(&xact->gnode->local_list, xact);
rv = ogs_gtp1_xact_update_tx(xact, hdesc, pkbuf);
if (rv != OGS_OK) {
ogs_error("ogs_gtp_xact_update_tx(rv=%d) failed", (int)rv);
ogs_gtp_xact_delete(xact);
return NULL;
}
ogs_debug("[%d] LOCAL Create peer [%s]:%d",
xact->xid,
OGS_ADDR(&gnode->addr, buf),
OGS_PORT(&gnode->addr));
return xact;
}
ogs_gtp_xact_t *ogs_gtp_xact_local_create(ogs_gtp_node_t *gnode,
ogs_gtp2_header_t *hdesc, ogs_pkbuf_t *pkbuf,
void (*cb)(ogs_gtp_xact_t *xact, void *data), void *data)
{
int rv;
char buf[OGS_ADDRSTRLEN];
ogs_gtp_xact_t *xact = NULL;
ogs_assert(gnode);
ogs_assert(hdesc);
ogs_pool_id_calloc(&pool, &xact);
ogs_assert(xact);
xact->index = ogs_pool_index(&pool, xact);
xact->gtp_version = 2;
xact->org = OGS_GTP_LOCAL_ORIGINATOR;
xact->xid = OGS_NEXT_ID(g_xact_id,
OGS_GTP_MIN_XACT_ID, OGS_GTP_CMD_XACT_ID);
if (hdesc->type == OGS_GTP2_MODIFY_BEARER_COMMAND_TYPE ||
hdesc->type == OGS_GTP2_DELETE_BEARER_COMMAND_TYPE ||
hdesc->type == OGS_GTP2_BEARER_RESOURCE_COMMAND_TYPE) {
xact->xid |= OGS_GTP_CMD_XACT_ID;
}
xact->gnode = gnode;
xact->cb = cb;
xact->data = data;
xact->tm_response = ogs_timer_add(
ogs_app()->timer_mgr, response_timeout,
OGS_UINT_TO_POINTER(xact->id));
ogs_assert(xact->tm_response);
xact->response_rcount =
ogs_local_conf()->time.message.gtp.n3_response_rcount,
xact->tm_holding = ogs_timer_add(
ogs_app()->timer_mgr, holding_timeout,
OGS_UINT_TO_POINTER(xact->id));
ogs_assert(xact->tm_holding);
xact->holding_rcount = ogs_local_conf()->time.message.gtp.n3_holding_rcount,
xact->tm_peer = ogs_timer_add(ogs_app()->timer_mgr, peer_timeout,
OGS_UINT_TO_POINTER(xact->id));
ogs_assert(xact->tm_peer);
ogs_list_add(&xact->gnode->local_list, xact);
rv = ogs_gtp_xact_update_tx(xact, hdesc, pkbuf);
if (rv != OGS_OK) {
ogs_error("ogs_gtp_xact_update_tx(rv=%d) failed", (int)rv);
ogs_gtp_xact_delete(xact);
return NULL;
}
ogs_debug("[%d] LOCAL Create peer [%s]:%d",
xact->xid,
OGS_ADDR(&gnode->addr, buf),
OGS_PORT(&gnode->addr));
return xact;
}
static ogs_gtp_xact_t *ogs_gtp_xact_remote_create(ogs_gtp_node_t *gnode, uint8_t gtp_version, uint32_t sqn)
{
char buf[OGS_ADDRSTRLEN];
ogs_gtp_xact_t *xact = NULL;
ogs_assert(gnode);
ogs_pool_id_calloc(&pool, &xact);
ogs_assert(xact);
xact->index = ogs_pool_index(&pool, xact);
xact->gtp_version = gtp_version;
xact->org = OGS_GTP_REMOTE_ORIGINATOR;
xact->xid = (gtp_version == 1) ?
OGS_GTP1_SQN_TO_XID(sqn) : OGS_GTP2_SQN_TO_XID(sqn);
xact->gnode = gnode;
xact->tm_response = ogs_timer_add(
ogs_app()->timer_mgr, response_timeout,
OGS_UINT_TO_POINTER(xact->id));
ogs_assert(xact->tm_response);
xact->response_rcount =
ogs_local_conf()->time.message.gtp.n3_response_rcount,
xact->tm_holding = ogs_timer_add(
ogs_app()->timer_mgr, holding_timeout,
OGS_UINT_TO_POINTER(xact->id));
ogs_assert(xact->tm_holding);
xact->holding_rcount = ogs_local_conf()->time.message.gtp.n3_holding_rcount,
xact->tm_peer = ogs_timer_add(ogs_app()->timer_mgr, peer_timeout,
OGS_UINT_TO_POINTER(xact->id));
ogs_assert(xact->tm_peer);
ogs_list_add(&xact->gnode->remote_list, xact);
ogs_debug("[%d] REMOTE Create peer [%s]:%d",
xact->xid,
OGS_ADDR(&gnode->addr, buf),
OGS_PORT(&gnode->addr));
return xact;
}
ogs_gtp_xact_t *ogs_gtp_xact_find_by_id(ogs_pool_id_t id)
{
return ogs_pool_find_by_id(&pool, id);
}
void ogs_gtp_xact_delete_all(ogs_gtp_node_t *gnode)
{
ogs_gtp_xact_t *xact = NULL, *next_xact = NULL;
ogs_list_for_each_safe(&gnode->local_list, next_xact, xact)
ogs_gtp_xact_delete(xact);
ogs_list_for_each_safe(&gnode->remote_list, next_xact, xact)
ogs_gtp_xact_delete(xact);
}
int ogs_gtp1_xact_update_tx(ogs_gtp_xact_t *xact,
ogs_gtp1_header_t *hdesc, ogs_pkbuf_t *pkbuf)
{
char buf[OGS_ADDRSTRLEN];
ogs_gtp_xact_stage_t stage;
ogs_gtp1_header_t *h = NULL;
int gtp_hlen = 0;
ogs_assert(xact);
ogs_assert(xact->gnode);
ogs_assert(hdesc);
ogs_assert(pkbuf);
ogs_debug("[%d] %s UPD TX-%d peer [%s]:%d",
xact->xid,
xact->org == OGS_GTP_LOCAL_ORIGINATOR ? "LOCAL " : "REMOTE",
hdesc->type,
OGS_ADDR(&xact->gnode->addr, buf),
OGS_PORT(&xact->gnode->addr));
stage = ogs_gtp1_xact_get_stage(hdesc->type, xact->xid);
if (xact->org == OGS_GTP_LOCAL_ORIGINATOR) {
switch (stage) {
case GTP_XACT_INITIAL_STAGE:
if (xact->step != 0) {
ogs_error("invalid step[%d]", xact->step);
ogs_pkbuf_free(pkbuf);
return OGS_ERROR;
}
break;
case GTP_XACT_INTERMEDIATE_STAGE:
ogs_expect(0);
ogs_pkbuf_free(pkbuf);
return OGS_ERROR;
case GTP_XACT_FINAL_STAGE:
if (xact->step != 2 && xact->step != 3) {
ogs_error("invalid step[%d]", xact->step);
ogs_pkbuf_free(pkbuf);
return OGS_ERROR;
}
break;
default:
ogs_assert_if_reached();
break;
}
} else if (xact->org == OGS_GTP_REMOTE_ORIGINATOR) {
switch (stage) {
case GTP_XACT_INITIAL_STAGE:
ogs_expect(0);
ogs_pkbuf_free(pkbuf);
return OGS_ERROR;
case GTP_XACT_INTERMEDIATE_STAGE:
case GTP_XACT_FINAL_STAGE:
if (xact->step != 1) {
ogs_error("invalid step[%d]", xact->step);
ogs_pkbuf_free(pkbuf);
return OGS_ERROR;
}
break;
default:
ogs_error("invalid stage[%d]", stage);
ogs_pkbuf_free(pkbuf);
return OGS_ERROR;
}
} else {
ogs_error("invalid org[%d]", xact->org);
ogs_pkbuf_free(pkbuf);
return OGS_ERROR;
}
gtp_hlen = OGS_GTPV1C_HEADER_LEN;
ogs_pkbuf_push(pkbuf, gtp_hlen);
h = (ogs_gtp1_header_t *)pkbuf->data;
memset(h, 0, gtp_hlen);
h->version = 1;
h->type = hdesc->type;
h->pt = 1; /* GTP */
h->teid = htobe32(hdesc->teid);
h->s = 1;
h->sqn = OGS_GTP1_XID_TO_SQN(xact->xid);
h->length = htobe16(pkbuf->len - 8);
/* Save Message type and packet of this step */
xact->seq[xact->step].type = h->type;
xact->seq[xact->step].pkbuf = pkbuf;
/* Step */
xact->step++;
return OGS_OK;
}
int ogs_gtp_xact_update_tx(ogs_gtp_xact_t *xact,
ogs_gtp2_header_t *hdesc, ogs_pkbuf_t *pkbuf)
{
char buf[OGS_ADDRSTRLEN];
ogs_gtp_xact_stage_t stage;
ogs_gtp2_header_t *h = NULL;
int gtp_hlen = 0;
ogs_assert(xact);
ogs_assert(xact->gnode);
ogs_assert(hdesc);
ogs_assert(pkbuf);
ogs_debug("[%d] %s UPD TX-%d peer [%s]:%d",
xact->xid,
xact->org == OGS_GTP_LOCAL_ORIGINATOR ? "LOCAL " : "REMOTE",
hdesc->type,
OGS_ADDR(&xact->gnode->addr, buf),
OGS_PORT(&xact->gnode->addr));
stage = ogs_gtp2_xact_get_stage(hdesc->type, xact->xid);
if (xact->org == OGS_GTP_LOCAL_ORIGINATOR) {
switch (stage) {
case GTP_XACT_INITIAL_STAGE:
if (xact->step != 0) {
ogs_error("invalid step[%d]", xact->step);
ogs_pkbuf_free(pkbuf);
return OGS_ERROR;
}
break;
case GTP_XACT_INTERMEDIATE_STAGE:
ogs_expect(0);
ogs_pkbuf_free(pkbuf);
return OGS_ERROR;
case GTP_XACT_FINAL_STAGE:
if (xact->step != 2) {
ogs_error("invalid step[%d]", xact->step);
ogs_pkbuf_free(pkbuf);
return OGS_ERROR;
}
break;
default:
ogs_assert_if_reached();
break;
}
} else if (xact->org == OGS_GTP_REMOTE_ORIGINATOR) {
switch (stage) {
case GTP_XACT_INITIAL_STAGE:
ogs_expect(0);
ogs_pkbuf_free(pkbuf);
return OGS_ERROR;
case GTP_XACT_INTERMEDIATE_STAGE:
case GTP_XACT_FINAL_STAGE:
if (xact->step != 1) {
ogs_error("invalid step[%d]", xact->step);
ogs_pkbuf_free(pkbuf);
return OGS_ERROR;
}
break;
default:
ogs_error("invalid stage[%d]", stage);
ogs_pkbuf_free(pkbuf);
return OGS_ERROR;
}
} else {
ogs_error("invalid org[%d]", xact->org);
ogs_pkbuf_free(pkbuf);
return OGS_ERROR;
}
if (hdesc->type > OGS_GTP2_VERSION_NOT_SUPPORTED_INDICATION_TYPE) {
gtp_hlen = OGS_GTPV2C_HEADER_LEN;
} else {
gtp_hlen = OGS_GTPV2C_HEADER_LEN - OGS_GTP2_TEID_LEN;
}
ogs_pkbuf_push(pkbuf, gtp_hlen);
h = (ogs_gtp2_header_t *)pkbuf->data;
memset(h, 0, gtp_hlen);
h->version = 2;
h->type = hdesc->type;
if (hdesc->type > OGS_GTP2_VERSION_NOT_SUPPORTED_INDICATION_TYPE) {
h->teid_presence = 1;
h->teid = htobe32(hdesc->teid);
h->sqn = OGS_GTP2_XID_TO_SQN(xact->xid);
} else {
h->teid_presence = 0;
h->sqn_only = OGS_GTP2_XID_TO_SQN(xact->xid);
}
h->length = htobe16(pkbuf->len - 4);
/* Save Message type and packet of this step */
xact->seq[xact->step].type = h->type;
xact->seq[xact->step].pkbuf = pkbuf;
/* Step */
xact->step++;
return OGS_OK;
}
static int ogs_gtp_xact_update_rx(ogs_gtp_xact_t *xact, uint8_t type)
{
char buf[OGS_ADDRSTRLEN];
ogs_gtp_xact_stage_t stage;
ogs_debug("[%d] %s UPD RX-%d peer [%s]:%d",
xact->xid,
xact->org == OGS_GTP_LOCAL_ORIGINATOR ? "LOCAL " : "REMOTE",
type,
OGS_ADDR(&xact->gnode->addr, buf),
OGS_PORT(&xact->gnode->addr));
if (xact->gtp_version == 1)
stage = ogs_gtp1_xact_get_stage(type, xact->xid);
else
stage = ogs_gtp2_xact_get_stage(type, xact->xid);
if (xact->org == OGS_GTP_LOCAL_ORIGINATOR) {
switch (stage) {
case GTP_XACT_INITIAL_STAGE:
ogs_expect(0);
return OGS_ERROR;
case GTP_XACT_INTERMEDIATE_STAGE:
if (xact->seq[1].type == type) {
ogs_pkbuf_t *pkbuf = NULL;
if (xact->step != 2 && xact->step != 3) {
ogs_error("invalid step[%d]", xact->step);
ogs_pkbuf_free(pkbuf);
return OGS_ERROR;
}
pkbuf = xact->seq[2].pkbuf;
if (pkbuf) {
if (xact->tm_holding)
ogs_timer_start(xact->tm_holding,
ogs_local_conf()->time.message.
gtp.t3_holding_duration);
ogs_warn("[%d] %s Request Duplicated. Retransmit!"
" for step %d type %d peer [%s]:%d",
xact->xid,
xact->org == OGS_GTP_LOCAL_ORIGINATOR ?
"LOCAL " : "REMOTE",
xact->step, type,
OGS_ADDR(&xact->gnode->addr,
buf),
OGS_PORT(&xact->gnode->addr));
ogs_expect(OGS_OK == ogs_gtp_sendto(xact->gnode, pkbuf));
} else {
ogs_warn("[%d] %s Request Duplicated. Discard!"
" for step %d type %d peer [%s]:%d",
xact->xid,
xact->org == OGS_GTP_LOCAL_ORIGINATOR ?
"LOCAL " : "REMOTE",
xact->step, type,
OGS_ADDR(&xact->gnode->addr,
buf),
OGS_PORT(&xact->gnode->addr));
}
return OGS_RETRY;
}
if (xact->step != 1) {
ogs_error("invalid step[%d]", xact->step);
return OGS_ERROR;
}
if (xact->tm_holding)
ogs_timer_start(xact->tm_holding,
ogs_local_conf()->time.message.gtp.t3_holding_duration);
break;
case GTP_XACT_FINAL_STAGE:
if (xact->step != 1) {
ogs_error("invalid step[%d]", xact->step);
return OGS_ERROR;
}
break;
default:
ogs_error("invalid stage[%d]", stage);
return OGS_ERROR;
}
} else if (xact->org == OGS_GTP_REMOTE_ORIGINATOR) {
switch (stage) {
case GTP_XACT_INITIAL_STAGE:
if (xact->seq[0].type == type) {
ogs_pkbuf_t *pkbuf = NULL;
if (xact->step != 1 && xact->step != 2) {
ogs_error("invalid step[%d]", xact->step);
return OGS_ERROR;
}
pkbuf = xact->seq[1].pkbuf;
if (pkbuf) {
if (xact->tm_holding)
ogs_timer_start(xact->tm_holding,
ogs_local_conf()->time.message.
gtp.t3_holding_duration);
ogs_warn("[%d] %s Request Duplicated. Retransmit!"
" for step %d type %d peer [%s]:%d",
xact->xid,
xact->org == OGS_GTP_LOCAL_ORIGINATOR ?
"LOCAL " : "REMOTE",
xact->step, type,
OGS_ADDR(&xact->gnode->addr,
buf),
OGS_PORT(&xact->gnode->addr));
ogs_expect(OGS_OK == ogs_gtp_sendto(xact->gnode, pkbuf));
} else {
ogs_warn("[%d] %s Request Duplicated. Discard!"
" for step %d type %d peer [%s]:%d",
xact->xid,
xact->org == OGS_GTP_LOCAL_ORIGINATOR ?
"LOCAL " : "REMOTE",
xact->step, type,
OGS_ADDR(&xact->gnode->addr,
buf),
OGS_PORT(&xact->gnode->addr));
}
return OGS_RETRY;
}
if (xact->step != 0) {
ogs_error("invalid step[%d]", xact->step);
return OGS_ERROR;
}
if (xact->tm_holding)
ogs_timer_start(xact->tm_holding,
ogs_local_conf()->time.message.gtp.t3_holding_duration);
break;
case GTP_XACT_INTERMEDIATE_STAGE:
ogs_expect(0);
return OGS_ERROR;
case GTP_XACT_FINAL_STAGE:
if (xact->step != 2) {
ogs_error("invalid step[%d]", xact->step);
return OGS_ERROR;
}
/* continue */
break;
default:
ogs_error("invalid stage[%d]", stage);
return OGS_ERROR;
}
} else {
ogs_error("invalid org[%d]", xact->org);
return OGS_ERROR;
}
if (xact->tm_response)
ogs_timer_stop(xact->tm_response);
/* Save Message type of this step */
xact->seq[xact->step].type = type;
/* Step */
xact->step++;
return OGS_OK;
}
int ogs_gtp_xact_commit(ogs_gtp_xact_t *xact)
{
char buf[OGS_ADDRSTRLEN];
uint8_t type;
ogs_pkbuf_t *pkbuf = NULL;
ogs_gtp_xact_stage_t stage;
ogs_assert(xact);
ogs_assert(xact->gnode);
ogs_debug("[%d] %s Commit peer [%s]:%d",
xact->xid,
xact->org == OGS_GTP_LOCAL_ORIGINATOR ? "LOCAL " : "REMOTE",
OGS_ADDR(&xact->gnode->addr, buf),
OGS_PORT(&xact->gnode->addr));
type = xact->seq[xact->step-1].type;
if (xact->gtp_version == 1)
stage = ogs_gtp1_xact_get_stage(type, xact->xid);
else
stage = ogs_gtp2_xact_get_stage(type, xact->xid);
if (xact->org == OGS_GTP_LOCAL_ORIGINATOR) {
switch (stage) {
case GTP_XACT_INITIAL_STAGE:
if (xact->step != 1) {
ogs_error("invalid step[%d]", xact->step);
ogs_gtp_xact_delete(xact);
return OGS_ERROR;
}
if (xact->tm_response)
ogs_timer_start(xact->tm_response,
ogs_local_conf()->time.message.gtp.
t3_response_duration);
break;
case GTP_XACT_INTERMEDIATE_STAGE:
if (xact->step != 2) {
ogs_error("invalid step[%d]", xact->step);
ogs_gtp_xact_delete(xact);
return OGS_ERROR;
}
return OGS_OK;
case GTP_XACT_FINAL_STAGE:
if (xact->step != 2 && xact->step != 3) {
ogs_error("invalid step[%d]", xact->step);
ogs_gtp_xact_delete(xact);
return OGS_ERROR;
}
if (xact->step == 2) {
ogs_gtp_xact_delete(xact);
return OGS_OK;
}
break;
default:
ogs_error("invalid stage[%d]", stage);
ogs_gtp_xact_delete(xact);
return OGS_ERROR;
}
} else if (xact->org == OGS_GTP_REMOTE_ORIGINATOR) {
switch (stage) {
case GTP_XACT_INITIAL_STAGE:
ogs_expect(0);
ogs_gtp_xact_delete(xact);
return OGS_ERROR;
case GTP_XACT_INTERMEDIATE_STAGE:
if (xact->step != 2) {
ogs_error("invalid step[%d]", xact->step);
ogs_gtp_xact_delete(xact);
return OGS_ERROR;
}
if (xact->tm_response)
ogs_timer_start(xact->tm_response,
ogs_local_conf()->time.message.gtp.
t3_response_duration);
break;
case GTP_XACT_FINAL_STAGE:
if (xact->step != 2 && xact->step != 3) {
ogs_error("invalid step[%d]", xact->step);
ogs_gtp_xact_delete(xact);
return OGS_ERROR;
}
if (xact->step == 3) {
ogs_gtp_xact_delete(xact);
return OGS_OK;
}
break;
default:
ogs_error("invalid stage[%d]", stage);
ogs_gtp_xact_delete(xact);
return OGS_ERROR;
}
} else {
ogs_error("invalid org[%d]", xact->org);
ogs_gtp_xact_delete(xact);
return OGS_ERROR;
}
pkbuf = xact->seq[xact->step-1].pkbuf;
ogs_assert(pkbuf);
ogs_expect(OGS_OK == ogs_gtp_sendto(xact->gnode, pkbuf));
return OGS_OK;
}
static void response_timeout(void *data)
{
char buf[OGS_ADDRSTRLEN];
ogs_pool_id_t xact_id = OGS_INVALID_POOL_ID;
ogs_gtp_xact_t *xact = NULL;
ogs_assert(data);
xact_id = OGS_POINTER_TO_UINT(data);
ogs_assert(xact_id >= OGS_MIN_POOL_ID && xact_id <= OGS_MAX_POOL_ID);
xact = ogs_gtp_xact_find_by_id(xact_id);
if (!xact) {
ogs_error("GTP Transaction has already been removed [%d]", xact_id);
return;;
}
ogs_assert(xact->gnode);
ogs_debug("[%d] %s Response Timeout "
"for step %d type %d peer [%s]:%d",
xact->xid,
xact->org == OGS_GTP_LOCAL_ORIGINATOR ? "LOCAL " : "REMOTE",
xact->step, xact->seq[xact->step-1].type,
OGS_ADDR(&xact->gnode->addr, buf),
OGS_PORT(&xact->gnode->addr));
if (--xact->response_rcount > 0) {
ogs_pkbuf_t *pkbuf = NULL;
if (xact->tm_response)
ogs_timer_start(xact->tm_response,
ogs_local_conf()->time.message.gtp.t3_response_duration);
pkbuf = xact->seq[xact->step-1].pkbuf;
ogs_assert(pkbuf);
ogs_expect(OGS_OK == ogs_gtp_sendto(xact->gnode, pkbuf));
} else {
ogs_warn("[%d] %s No Reponse. Give up! "
"for step %d type %d peer [%s]:%d",
xact->xid,
xact->org == OGS_GTP_LOCAL_ORIGINATOR ? "LOCAL " : "REMOTE",
xact->step, xact->seq[xact->step-1].type,
OGS_ADDR(&xact->gnode->addr, buf),
OGS_PORT(&xact->gnode->addr));
if (xact->cb)
xact->cb(xact, xact->data);
ogs_gtp_xact_delete(xact);
}
}
static void holding_timeout(void *data)
{
char buf[OGS_ADDRSTRLEN];
ogs_pool_id_t xact_id = OGS_INVALID_POOL_ID;
ogs_gtp_xact_t *xact = NULL;
ogs_assert(data);
xact_id = OGS_POINTER_TO_UINT(data);
ogs_assert(xact_id >= OGS_MIN_POOL_ID && xact_id <= OGS_MAX_POOL_ID);
xact = ogs_gtp_xact_find_by_id(xact_id);
if (!xact) {
ogs_error("GTP Transaction has already been removed [%d]", xact_id);
return;;
}
ogs_assert(xact->gnode);
ogs_debug("[%d] %s Holding Timeout "
"for step %d type %d peer [%s]:%d",
xact->xid,
xact->org == OGS_GTP_LOCAL_ORIGINATOR ? "LOCAL " : "REMOTE",
xact->step, xact->seq[xact->step-1].type,
OGS_ADDR(&xact->gnode->addr, buf),
OGS_PORT(&xact->gnode->addr));
if (--xact->holding_rcount > 0) {
if (xact->tm_holding)
ogs_timer_start(xact->tm_holding,
ogs_local_conf()->time.message.gtp.t3_holding_duration);
} else {
ogs_debug("[%d] %s Delete Transaction "
"for step %d type %d peer [%s]:%d",
xact->xid,
xact->org == OGS_GTP_LOCAL_ORIGINATOR ? "LOCAL " : "REMOTE",
xact->step, xact->seq[xact->step-1].type,
OGS_ADDR(&xact->gnode->addr, buf),
OGS_PORT(&xact->gnode->addr));
ogs_gtp_xact_delete(xact);
}
}
static void peer_timeout(void *data)
{
char buf[OGS_ADDRSTRLEN];
ogs_pool_id_t xact_id = OGS_INVALID_POOL_ID;
ogs_gtp_xact_t *xact = NULL;
ogs_assert(data);
xact_id = OGS_POINTER_TO_UINT(data);
ogs_assert(xact_id >= OGS_MIN_POOL_ID && xact_id <= OGS_MAX_POOL_ID);
xact = ogs_gtp_xact_find_by_id(xact_id);
if (!xact) {
ogs_error("GTP Transaction has already been removed [%d]", xact_id);
return;;
}
ogs_assert(xact->gnode);
ogs_error("[%d] %s Peer Timeout "
"for step %d type %d peer [%s]:%d",
xact->xid,
xact->org == OGS_GTP_LOCAL_ORIGINATOR ? "LOCAL " : "REMOTE",
xact->step, xact->seq[xact->step-1].type,
OGS_ADDR(&xact->gnode->addr, buf),
OGS_PORT(&xact->gnode->addr));
if (xact->peer_cb)
xact->peer_cb(xact, xact->peer_data);
}
int ogs_gtp1_xact_receive(
ogs_gtp_node_t *gnode, ogs_gtp1_header_t *h, ogs_gtp_xact_t **xact)
{
int rv;
char buf[OGS_ADDRSTRLEN];
uint8_t type;
uint32_t sqn, xid;
ogs_gtp_xact_stage_t stage;
ogs_list_t *list = NULL;
ogs_gtp_xact_t *new = NULL;
ogs_assert(gnode);
ogs_assert(h);
type = h->type;
if (!h->s) {
ogs_error("ogs_gtp_xact_update_rx() failed, pkt has no SQN");
return OGS_ERROR;
}
sqn = h->sqn;
xid = OGS_GTP1_SQN_TO_XID(sqn);
stage = ogs_gtp1_xact_get_stage(type, xid);
switch (stage) {
case GTP_XACT_INITIAL_STAGE:
list = &gnode->remote_list;
break;
case GTP_XACT_INTERMEDIATE_STAGE:
list = &gnode->local_list;
break;
case GTP_XACT_FINAL_STAGE:
/* For types which are replies to replies, the xact is never locally
* created during transmit, but actually during rx of the initial req, hence
* it is never placed in the local_list, but in the remote_list. */
if (type == OGS_GTP1_SGSN_CONTEXT_ACKNOWLEDGE_TYPE)
list = &gnode->remote_list;
else
list = &gnode->local_list;
break;
default:
ogs_error("[%d] Unexpected type %u from GTPv1 peer [%s]:%d",
xid, type, OGS_ADDR(&gnode->addr, buf), OGS_PORT(&gnode->addr));
return OGS_ERROR;
}
ogs_assert(list);
ogs_list_for_each(list, new) {
if (new->gtp_version == 1 && new->xid == xid) {
ogs_debug("[%d] %s Find GTPv%u peer [%s]:%d",
new->xid,
new->org == OGS_GTP_LOCAL_ORIGINATOR ? "LOCAL " : "REMOTE",
new->gtp_version,
OGS_ADDR(&gnode->addr, buf),
OGS_PORT(&gnode->addr));
break;
}
}
if (!new) {
ogs_debug("[%d] Cannot find xact type %u from GTPv1 peer [%s]:%d",
xid, type, OGS_ADDR(&gnode->addr, buf), OGS_PORT(&gnode->addr));
new = ogs_gtp_xact_remote_create(gnode, 1, sqn);
}
ogs_assert(new);
ogs_debug("[%d] %s Receive peer [%s]:%d",
new->xid,
new->org == OGS_GTP_LOCAL_ORIGINATOR ? "LOCAL " : "REMOTE",
OGS_ADDR(&gnode->addr, buf),
OGS_PORT(&gnode->addr));
rv = ogs_gtp_xact_update_rx(new, type);
if (rv == OGS_ERROR) {
ogs_error("ogs_gtp_xact_update_rx() failed");
ogs_gtp_xact_delete(new);
return rv;
} else if (rv == OGS_RETRY) {
return rv;
}
*xact = new;
return rv;
}
int ogs_gtp_xact_receive(
ogs_gtp_node_t *gnode, ogs_gtp2_header_t *h, ogs_gtp_xact_t **xact)
{
int rv;
char buf[OGS_ADDRSTRLEN];
uint8_t type;
uint32_t sqn, xid;
ogs_gtp_xact_stage_t stage;
ogs_list_t *list = NULL;
ogs_gtp_xact_t *new = NULL;
ogs_assert(gnode);
ogs_assert(h);
type = h->type;
if (h->teid_presence) sqn = h->sqn;
else sqn = h->sqn_only;
xid = OGS_GTP2_SQN_TO_XID(sqn);
stage = ogs_gtp2_xact_get_stage(type, xid);
switch (stage) {
case GTP_XACT_INITIAL_STAGE:
list = &gnode->remote_list;
break;
case GTP_XACT_INTERMEDIATE_STAGE:
list = &gnode->local_list;
break;
case GTP_XACT_FINAL_STAGE:
if (xid & OGS_GTP_CMD_XACT_ID) {
if (type == OGS_GTP2_MODIFY_BEARER_FAILURE_INDICATION_TYPE ||
type == OGS_GTP2_DELETE_BEARER_FAILURE_INDICATION_TYPE ||
type == OGS_GTP2_BEARER_RESOURCE_FAILURE_INDICATION_TYPE) {
list = &gnode->local_list;
} else {
list = &gnode->remote_list;
}
} else {
list = &gnode->local_list;
}
break;
default:
ogs_error("[%d] Unexpected type %u from GTPv2 peer [%s]:%d",
xid, type, OGS_ADDR(&gnode->addr, buf), OGS_PORT(&gnode->addr));
return OGS_ERROR;
}
ogs_assert(list);
ogs_list_for_each(list, new) {
if (new->gtp_version == 2 && new->xid == xid) {
ogs_debug("[%d] %s Find GTPv%u peer [%s]:%d",
new->xid,
new->org == OGS_GTP_LOCAL_ORIGINATOR ? "LOCAL " : "REMOTE",
new->gtp_version,
OGS_ADDR(&gnode->addr, buf),
OGS_PORT(&gnode->addr));
break;
}
}
if (!new) {
ogs_debug("[%d] Cannot find xact type %u from GTPv2 peer [%s]:%d",
xid, type, OGS_ADDR(&gnode->addr, buf), OGS_PORT(&gnode->addr));
new = ogs_gtp_xact_remote_create(gnode, 2, sqn);
}
ogs_assert(new);
ogs_debug("[%d] %s Receive peer [%s]:%d",
new->xid,
new->org == OGS_GTP_LOCAL_ORIGINATOR ? "LOCAL " : "REMOTE",
OGS_ADDR(&gnode->addr, buf),
OGS_PORT(&gnode->addr));
rv = ogs_gtp_xact_update_rx(new, type);
if (rv == OGS_ERROR) {
ogs_error("ogs_gtp_xact_update_rx() failed");
ogs_gtp_xact_delete(new);
return rv;
} else if (rv == OGS_RETRY) {
return rv;
}
*xact = new;
return rv;
}
static ogs_gtp_xact_stage_t ogs_gtp1_xact_get_stage(uint8_t type, uint32_t xid)
{
ogs_gtp_xact_stage_t stage = GTP_XACT_UNKNOWN_STAGE;
switch (type) {
case OGS_GTP1_ECHO_REQUEST_TYPE:
case OGS_GTP1_NODE_ALIVE_REQUEST_TYPE:
case OGS_GTP1_REDIRECTION_REQUEST_TYPE:
case OGS_GTP1_CREATE_PDP_CONTEXT_REQUEST_TYPE:
case OGS_GTP1_UPDATE_PDP_CONTEXT_REQUEST_TYPE:
case OGS_GTP1_DELETE_PDP_CONTEXT_REQUEST_TYPE:
case OGS_GTP1_INITIATE_PDP_CONTEXT_ACTIVATION_REQUEST_TYPE:
case OGS_GTP1_PDU_NOTIFICATION_REQUEST_TYPE:
case OGS_GTP1_PDU_NOTIFICATION_REJECT_REQUEST_TYPE:
case OGS_GTP1_SEND_ROUTEING_INFORMATION_FOR_GPRS_REQUEST_TYPE:
case OGS_GTP1_FAILURE_REPORT_REQUEST_TYPE:
case OGS_GTP1_NOTE_MS_GPRS_PRESENT_REQUEST_TYPE:
case OGS_GTP1_IDENTIFICATION_REQUEST_TYPE:
case OGS_GTP1_SGSN_CONTEXT_REQUEST_TYPE:
case OGS_GTP1_FORWARD_RELOCATION_REQUEST_TYPE:
case OGS_GTP1_RELOCATION_CANCEL_REQUEST_TYPE:
case OGS_GTP1_UE_REGISTRATION_QUERY_REQUEST_TYPE:
case OGS_GTP1_RAN_INFORMATION_RELAY_TYPE:
stage = GTP_XACT_INITIAL_STAGE;
break;
case OGS_GTP1_SGSN_CONTEXT_RESPONSE_TYPE:
stage = GTP_XACT_INTERMEDIATE_STAGE;
break;
case OGS_GTP1_ECHO_RESPONSE_TYPE:
case OGS_GTP1_NODE_ALIVE_RESPONSE_TYPE:
case OGS_GTP1_REDIRECTION_RESPONSE_TYPE:
case OGS_GTP1_CREATE_PDP_CONTEXT_RESPONSE_TYPE:
case OGS_GTP1_UPDATE_PDP_CONTEXT_RESPONSE_TYPE:
case OGS_GTP1_DELETE_PDP_CONTEXT_RESPONSE_TYPE:
case OGS_GTP1_INITIATE_PDP_CONTEXT_ACTIVATION_RESPONSE_TYPE:
case OGS_GTP1_PDU_NOTIFICATION_RESPONSE_TYPE:
case OGS_GTP1_PDU_NOTIFICATION_REJECT_RESPONSE_TYPE:
case OGS_GTP1_SEND_ROUTEING_INFORMATION_FOR_GPRS_RESPONSE_TYPE:
case OGS_GTP1_FAILURE_REPORT_RESPONSE_TYPE:
case OGS_GTP1_NOTE_MS_GPRS_PRESENT_RESPONSE_TYPE:
case OGS_GTP1_IDENTIFICATION_RESPONSE_TYPE:
case OGS_GTP1_SGSN_CONTEXT_ACKNOWLEDGE_TYPE:
case OGS_GTP1_FORWARD_RELOCATION_RESPONSE_TYPE:
case OGS_GTP1_RELOCATION_CANCEL_RESPONSE_TYPE:
case OGS_GTP1_UE_REGISTRATION_QUERY_RESPONSE_TYPE:
stage = GTP_XACT_FINAL_STAGE;
break;
default:
ogs_error("Not implemented GTPv1 Message Type(%d)", type);
break;
}
return stage;
}
/* TS 29.274 Table 6.1-1 */
static ogs_gtp_xact_stage_t ogs_gtp2_xact_get_stage(uint8_t type, uint32_t xid)
{
ogs_gtp_xact_stage_t stage = GTP_XACT_UNKNOWN_STAGE;
switch (type) {
case OGS_GTP2_ECHO_REQUEST_TYPE:
case OGS_GTP2_CREATE_SESSION_REQUEST_TYPE:
case OGS_GTP2_MODIFY_BEARER_REQUEST_TYPE:
case OGS_GTP2_DELETE_SESSION_REQUEST_TYPE:
case OGS_GTP2_CHANGE_NOTIFICATION_REQUEST_TYPE:
case OGS_GTP2_REMOTE_UE_REPORT_NOTIFICATION_TYPE:
case OGS_GTP2_MODIFY_BEARER_COMMAND_TYPE:
case OGS_GTP2_DELETE_BEARER_COMMAND_TYPE:
case OGS_GTP2_BEARER_RESOURCE_COMMAND_TYPE:
case OGS_GTP2_TRACE_SESSION_ACTIVATION_TYPE:
case OGS_GTP2_TRACE_SESSION_DEACTIVATION_TYPE:
case OGS_GTP2_STOP_PAGING_INDICATION_TYPE:
case OGS_GTP2_DELETE_PDN_CONNECTION_SET_REQUEST_TYPE:
case OGS_GTP2_PGW_DOWNLINK_TRIGGERING_NOTIFICATION_TYPE:
case OGS_GTP2_CREATE_FORWARDING_TUNNEL_REQUEST_TYPE:
case OGS_GTP2_SUSPEND_NOTIFICATION_TYPE:
case OGS_GTP2_RESUME_NOTIFICATION_TYPE:
case OGS_GTP2_CREATE_INDIRECT_DATA_FORWARDING_TUNNEL_REQUEST_TYPE:
case OGS_GTP2_DELETE_INDIRECT_DATA_FORWARDING_TUNNEL_REQUEST_TYPE:
case OGS_GTP2_RELEASE_ACCESS_BEARERS_REQUEST_TYPE:
case OGS_GTP2_DOWNLINK_DATA_NOTIFICATION_TYPE:
case OGS_GTP2_PGW_RESTART_NOTIFICATION_TYPE:
case OGS_GTP2_UPDATE_PDN_CONNECTION_SET_REQUEST_TYPE:
case OGS_GTP2_MODIFY_ACCESS_BEARERS_REQUEST_TYPE:
stage = GTP_XACT_INITIAL_STAGE;
break;
case OGS_GTP2_CREATE_BEARER_REQUEST_TYPE:
case OGS_GTP2_UPDATE_BEARER_REQUEST_TYPE:
case OGS_GTP2_DELETE_BEARER_REQUEST_TYPE:
if (xid & OGS_GTP_CMD_XACT_ID)
stage = GTP_XACT_INTERMEDIATE_STAGE;
else
stage = GTP_XACT_INITIAL_STAGE;
break;
case OGS_GTP2_ECHO_RESPONSE_TYPE:
case OGS_GTP2_VERSION_NOT_SUPPORTED_INDICATION_TYPE:
case OGS_GTP2_CREATE_SESSION_RESPONSE_TYPE:
case OGS_GTP2_MODIFY_BEARER_RESPONSE_TYPE:
case OGS_GTP2_DELETE_SESSION_RESPONSE_TYPE:
case OGS_GTP2_CHANGE_NOTIFICATION_RESPONSE_TYPE:
case OGS_GTP2_REMOTE_UE_REPORT_ACKNOWLEDGE_TYPE:
case OGS_GTP2_MODIFY_BEARER_FAILURE_INDICATION_TYPE:
case OGS_GTP2_DELETE_BEARER_FAILURE_INDICATION_TYPE:
case OGS_GTP2_BEARER_RESOURCE_FAILURE_INDICATION_TYPE:
case OGS_GTP2_DOWNLINK_DATA_NOTIFICATION_FAILURE_INDICATION_TYPE:
case OGS_GTP2_CREATE_BEARER_RESPONSE_TYPE:
case OGS_GTP2_UPDATE_BEARER_RESPONSE_TYPE:
case OGS_GTP2_DELETE_BEARER_RESPONSE_TYPE:
case OGS_GTP2_DELETE_PDN_CONNECTION_SET_RESPONSE_TYPE:
case OGS_GTP2_PGW_DOWNLINK_TRIGGERING_ACKNOWLEDGE_TYPE:
case OGS_GTP2_CREATE_FORWARDING_TUNNEL_RESPONSE_TYPE:
case OGS_GTP2_SUSPEND_ACKNOWLEDGE_TYPE:
case OGS_GTP2_RESUME_ACKNOWLEDGE_TYPE:
case OGS_GTP2_CREATE_INDIRECT_DATA_FORWARDING_TUNNEL_RESPONSE_TYPE:
case OGS_GTP2_DELETE_INDIRECT_DATA_FORWARDING_TUNNEL_RESPONSE_TYPE:
case OGS_GTP2_RELEASE_ACCESS_BEARERS_RESPONSE_TYPE:
case OGS_GTP2_DOWNLINK_DATA_NOTIFICATION_ACKNOWLEDGE_TYPE:
case OGS_GTP2_PGW_RESTART_NOTIFICATION_ACKNOWLEDGE_TYPE:
case OGS_GTP2_UPDATE_PDN_CONNECTION_SET_RESPONSE_TYPE:
case OGS_GTP2_MODIFY_ACCESS_BEARERS_RESPONSE_TYPE:
stage = GTP_XACT_FINAL_STAGE;
break;
default:
ogs_error("Not implemented GTPv2 Message Type(%d)", type);
break;
}
return stage;
}
void ogs_gtp_xact_associate(ogs_gtp_xact_t *xact1, ogs_gtp_xact_t *xact2)
{
ogs_assert(xact1);
ogs_assert(xact2);
ogs_assert(xact1->assoc_xact_id == OGS_INVALID_POOL_ID);
ogs_assert(xact2->assoc_xact_id == OGS_INVALID_POOL_ID);
xact1->assoc_xact_id = xact2->id;
xact2->assoc_xact_id = xact1->id;
}
void ogs_gtp_xact_deassociate(ogs_gtp_xact_t *xact1, ogs_gtp_xact_t *xact2)
{
ogs_assert(xact1);
ogs_assert(xact2);
ogs_assert(xact1->assoc_xact_id != OGS_INVALID_POOL_ID);
ogs_assert(xact2->assoc_xact_id != OGS_INVALID_POOL_ID);
xact1->assoc_xact_id = OGS_INVALID_POOL_ID;
xact2->assoc_xact_id = OGS_INVALID_POOL_ID;
}
static int ogs_gtp_xact_delete(ogs_gtp_xact_t *xact)
{
char buf[OGS_ADDRSTRLEN];
ogs_gtp_xact_t *assoc_xact = NULL;
ogs_assert(xact);
ogs_assert(xact->gnode);
ogs_debug("[%d] %s Delete peer [%s]:%d",
xact->xid,
xact->org == OGS_GTP_LOCAL_ORIGINATOR ? "LOCAL " : "REMOTE",
OGS_ADDR(&xact->gnode->addr, buf),
OGS_PORT(&xact->gnode->addr));
if (xact->seq[0].pkbuf)
ogs_pkbuf_free(xact->seq[0].pkbuf);
if (xact->seq[1].pkbuf)
ogs_pkbuf_free(xact->seq[1].pkbuf);
if (xact->seq[2].pkbuf)
ogs_pkbuf_free(xact->seq[2].pkbuf);
if (xact->tm_response)
ogs_timer_delete(xact->tm_response);
if (xact->tm_holding)
ogs_timer_delete(xact->tm_holding);
if (xact->tm_peer)
ogs_timer_delete(xact->tm_peer);
assoc_xact = ogs_gtp_xact_find_by_id(xact->assoc_xact_id);
if (assoc_xact)
ogs_gtp_xact_deassociate(xact, assoc_xact);
ogs_list_remove(xact->org == OGS_GTP_LOCAL_ORIGINATOR ?
&xact->gnode->local_list : &xact->gnode->remote_list, xact);
ogs_pool_id_free(&pool, xact);
return OGS_OK;
}
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