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open5gs/src/pgw/pgw-s5c-handler.c

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/*
* Copyright (C) 2019 by Sukchan Lee <acetcom@gmail.com>
*
* 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 "pgw-event.h"
#include "pgw-context.h"
#include "pgw-gtp-path.h"
#include "pgw-fd-path.h"
#include "pgw-s5c-build.h"
#include "pgw-s5c-handler.h"
#include "ipfw/ipfw2.h"
void pgw_s5c_handle_create_session_request(
pgw_sess_t *sess, ogs_gtp_xact_t *xact,
ogs_pkbuf_t *gtpbuf, ogs_gtp_create_session_request_t *req)
{
int rv;
uint8_t cause_value = 0;
ogs_gtp_f_teid_t *sgw_s5c_teid, *sgw_s5u_teid;
ogs_gtp_node_t *sgw = NULL;
pgw_bearer_t *bearer = NULL;
ogs_gtp_bearer_qos_t bearer_qos;
ogs_gtp_ambr_t *ambr = NULL;
ogs_gtp_uli_t uli;
uint16_t decoded = 0;
ogs_assert(xact);
ogs_assert(req);
ogs_debug("[PGW] Create Session Reqeust");
cause_value = OGS_GTP_CAUSE_REQUEST_ACCEPTED;
if (sess) {
bearer = pgw_default_bearer_in_sess(sess);
ogs_assert(bearer);
}
if (!bearer) {
ogs_warn("No Context");
cause_value = OGS_GTP_CAUSE_CONTEXT_NOT_FOUND;
}
if (req->imsi.presence == 0) {
ogs_error("No IMSI");
cause_value = OGS_GTP_CAUSE_MANDATORY_IE_MISSING;
}
if (req->sender_f_teid_for_control_plane.presence == 0) {
ogs_error("No TEID");
cause_value = OGS_GTP_CAUSE_MANDATORY_IE_MISSING;
}
if (req->bearer_contexts_to_be_created.presence == 0) {
ogs_error("No Bearer");
cause_value = OGS_GTP_CAUSE_MANDATORY_IE_MISSING;
}
if (req->bearer_contexts_to_be_created.bearer_level_qos.presence == 0) {
ogs_error("No EPS Bearer QoS");
cause_value = OGS_GTP_CAUSE_MANDATORY_IE_MISSING;
}
if (req->bearer_contexts_to_be_created.s5_s8_u_sgw_f_teid.presence == 0) {
ogs_error("No TEID");
cause_value = OGS_GTP_CAUSE_MANDATORY_IE_MISSING;
}
if (req->user_location_information.presence == 0) {
ogs_error("No User Location Inforamtion");
cause_value = OGS_GTP_CAUSE_MANDATORY_IE_MISSING;
}
if (cause_value != OGS_GTP_CAUSE_REQUEST_ACCEPTED) {
ogs_gtp_send_error_message(xact, sess ? sess->sgw_s5c_teid : 0,
OGS_GTP_CREATE_SESSION_RESPONSE_TYPE, cause_value);
ogs_pkbuf_free(gtpbuf);
return;
}
/* Set IMSI */
sess->imsi_len = req->imsi.len;
memcpy(sess->imsi, req->imsi.data, sess->imsi_len);
ogs_buffer_to_bcd(sess->imsi, sess->imsi_len, sess->imsi_bcd);
/* Control Plane(DL) : SGW-S5C */
sgw_s5c_teid = req->sender_f_teid_for_control_plane.data;
ogs_assert(sgw_s5c_teid);
sess->sgw_s5c_teid = ntohl(sgw_s5c_teid->teid);
/* Control Plane(DL) : SGW-S5U */
sgw_s5u_teid = req->bearer_contexts_to_be_created.s5_s8_u_sgw_f_teid.data;
ogs_assert(sgw_s5u_teid);
bearer->sgw_s5u_teid = ntohl(sgw_s5u_teid->teid);
ogs_debug(" SGW_S5C_TEID[0x%x] PGW_S5C_TEID[0x%x]",
sess->sgw_s5c_teid, sess->pgw_s5c_teid);
ogs_debug(" SGW_S5U_TEID[%d] PGW_S5U_TEID[%d]",
bearer->sgw_s5u_teid, bearer->pgw_s5u_teid);
sgw = ogs_gtp_node_find_by_f_teid(&pgw_self()->sgw_s5u_list, sgw_s5u_teid);
if (!sgw) {
sgw = ogs_gtp_node_add(&pgw_self()->sgw_s5u_list, sgw_s5u_teid,
pgw_self()->gtpu_port,
ogs_config()->parameter.no_ipv4,
ogs_config()->parameter.no_ipv6,
ogs_config()->parameter.prefer_ipv4);
ogs_assert(sgw);
rv = ogs_gtp_connect(
pgw_self()->gtpu_sock, pgw_self()->gtpu_sock6, sgw);
ogs_assert(rv == OGS_OK);
}
/* Setup GTP Node */
OGS_SETUP_GTP_NODE(bearer, sgw);
decoded = ogs_gtp_parse_bearer_qos(&bearer_qos,
&req->bearer_contexts_to_be_created.bearer_level_qos);
ogs_assert(req->bearer_contexts_to_be_created.bearer_level_qos.len ==
decoded);
sess->pdn.qos.qci = bearer_qos.qci;
sess->pdn.qos.arp.priority_level = bearer_qos.priority_level;
sess->pdn.qos.arp.pre_emption_capability =
bearer_qos.pre_emption_capability;
sess->pdn.qos.arp.pre_emption_vulnerability =
bearer_qos.pre_emption_vulnerability;
/* Set AMBR if available */
if (req->aggregate_maximum_bit_rate.presence) {
/*
* Ch 8.7. Aggregate Maximum Bit Rate(AMBR) in TS 29.274 V15.9.0
*
* AMBR is defined in clause 9.9.4.2 of 3GPP TS 24.301 [23],
* but it shall be encoded as shown in Figure 8.7-1 as
* Unsigned32 binary integer values in kbps (1000 bits per second).
*/
ambr = req->aggregate_maximum_bit_rate.data;
sess->pdn.ambr.downlink = be32toh(ambr->downlink) * 1000;
sess->pdn.ambr.uplink = be32toh(ambr->uplink) * 1000;
}
/* Set User Location Information */
decoded = ogs_gtp_parse_uli(&uli, &req->user_location_information);
ogs_assert(req->user_location_information.len == decoded);
memcpy(&sess->tai.plmn_id, &uli.tai.plmn_id, sizeof(uli.tai.plmn_id));
sess->tai.tac = uli.tai.tac;
memcpy(&sess->e_cgi.plmn_id, &uli.e_cgi.plmn_id, sizeof(uli.e_cgi.plmn_id));
sess->e_cgi.cell_id = uli.e_cgi.cell_id;
pgw_gx_send_ccr(sess, xact, gtpbuf,
OGS_DIAM_GX_CC_REQUEST_TYPE_INITIAL_REQUEST);
}
void pgw_s5c_handle_delete_session_request(
pgw_sess_t *sess, ogs_gtp_xact_t *xact,
ogs_pkbuf_t *gtpbuf, ogs_gtp_delete_session_request_t *req)
{
ogs_debug("[PGW] Delete Session Request");
ogs_assert(xact);
ogs_assert(req);
if (!sess) {
ogs_warn("No Context");
ogs_gtp_send_error_message(xact, sess ? sess->sgw_s5c_teid : 0,
OGS_GTP_DELETE_SESSION_RESPONSE_TYPE,
OGS_GTP_CAUSE_CONTEXT_NOT_FOUND);
ogs_pkbuf_free(gtpbuf);
return;
}
ogs_debug(" SGW_S5C_TEID[0x%x] PGW_S5C_TEID[0x%x]",
sess->sgw_s5c_teid, sess->pgw_s5c_teid);
pgw_gx_send_ccr(sess, xact, gtpbuf,
OGS_DIAM_GX_CC_REQUEST_TYPE_TERMINATION_REQUEST);
}
void pgw_s5c_handle_create_bearer_response(
pgw_sess_t *sess, ogs_gtp_xact_t *xact,
ogs_gtp_create_bearer_response_t *req)
{
int rv;
ogs_gtp_f_teid_t *sgw_s5u_teid, *pgw_s5u_teid;
ogs_gtp_node_t *sgw = NULL;
pgw_bearer_t *bearer = NULL;
ogs_assert(xact);
ogs_assert(sess);
ogs_assert(req);
ogs_debug("[PGW] Create Bearer Response");
ogs_debug(" SGW_S5C_TEID[0x%x] PGW_S5C_TEID[0x%x]",
sess->sgw_s5c_teid, sess->pgw_s5c_teid);
if (req->bearer_contexts.presence == 0) {
ogs_error("No Bearer");
return;
}
if (req->bearer_contexts.eps_bearer_id.presence == 0) {
ogs_error("No EPS Bearer ID");
return;
}
if (req->bearer_contexts.s5_s8_u_pgw_f_teid.presence == 0) {
ogs_error("No PGW TEID");
return;
}
if (req->bearer_contexts.s5_s8_u_sgw_f_teid.presence == 0) {
ogs_error("No SGW TEID");
return;
}
/* Correlate with PGW-S5U-TEID */
pgw_s5u_teid = req->bearer_contexts.s5_s8_u_pgw_f_teid.data;
ogs_assert(pgw_s5u_teid);
/* Find the Bearer by PGW-S5U-TEID */
bearer = pgw_bearer_find_by_pgw_s5u_teid(ntohl(pgw_s5u_teid->teid));
ogs_assert(bearer);
/* Set EBI */
bearer->ebi = req->bearer_contexts.eps_bearer_id.u8;
/* Data Plane(DL) : SGW-S5U */
sgw_s5u_teid = req->bearer_contexts.s5_s8_u_sgw_f_teid.data;
bearer->sgw_s5u_teid = ntohl(sgw_s5u_teid->teid);
sgw = ogs_gtp_node_find_by_f_teid(&pgw_self()->sgw_s5u_list, sgw_s5u_teid);
if (!sgw) {
sgw = ogs_gtp_node_add(&pgw_self()->sgw_s5u_list, sgw_s5u_teid,
pgw_self()->gtpu_port,
ogs_config()->parameter.no_ipv4,
ogs_config()->parameter.no_ipv6,
ogs_config()->parameter.prefer_ipv4);
ogs_assert(sgw);
rv = ogs_gtp_connect(pgw_self()->gtpu_sock, pgw_self()->gtpu_sock6, sgw);
ogs_assert(rv == OGS_OK);
}
/* Setup GTP Node */
OGS_SETUP_GTP_NODE(bearer, sgw);
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
ogs_debug("[PGW] Create Bearer Response : SGW[0x%x] --> PGW[0x%x]",
sess->sgw_s5c_teid, sess->pgw_s5c_teid);
}
void pgw_s5c_handle_update_bearer_response(
pgw_sess_t *sess, ogs_gtp_xact_t *xact,
ogs_gtp_update_bearer_response_t *req)
{
int rv;
ogs_assert(xact);
ogs_assert(sess);
ogs_assert(req);
ogs_debug("[PGW] Update Bearer Request");
ogs_debug(" SGW_S5C_TEID[0x%x] PGW_S5C_TEID[0x%x]",
sess->sgw_s5c_teid, sess->pgw_s5c_teid);
if (req->bearer_contexts.presence == 0) {
ogs_error("No Bearer");
return;
}
if (req->bearer_contexts.eps_bearer_id.presence == 0) {
ogs_error("No EPS Bearer ID");
return;
}
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
ogs_debug("[PGW] Update Bearer Response : SGW[0x%x] --> PGW[0x%x]",
sess->sgw_s5c_teid, sess->pgw_s5c_teid);
}
void pgw_s5c_handle_delete_bearer_response(
pgw_sess_t *sess, ogs_gtp_xact_t *xact,
ogs_gtp_delete_bearer_response_t *req)
{
int rv;
pgw_bearer_t *bearer = NULL;
ogs_assert(xact);
ogs_assert(sess);
ogs_assert(req);
ogs_debug("[PGW] Delete Bearer Request");
ogs_debug(" SGW_S5C_TEID[0x%x] PGW_S5C_TEID[0x%x]",
sess->sgw_s5c_teid, sess->pgw_s5c_teid);
if (req->bearer_contexts.presence == 0) {
ogs_error("No Bearer");
return;
}
if (req->bearer_contexts.eps_bearer_id.presence == 0) {
ogs_error("No EPS Bearer ID");
return;
}
bearer = pgw_bearer_find_by_ebi(
sess, req->bearer_contexts.eps_bearer_id.u8);
ogs_assert(bearer);
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
ogs_debug("[PGW] Delete Bearer Response : SGW[0x%x] --> PGW[0x%x]",
sess->sgw_s5c_teid, sess->pgw_s5c_teid);
pgw_bearer_remove(bearer);
}
static int reconfigure_packet_filter(pgw_pf_t *pf, ogs_gtp_tft_t *tft, int i)
{
int j;
for (j = 0; j < tft->pf[i].num_of_component; j++) {
switch(tft->pf[i].component[j].type) {
case GTP_PACKET_FILTER_PROTOCOL_IDENTIFIER_NEXT_HEADER_TYPE:
pf->rule.proto = tft->pf[i].component[j].proto;
break;
case GTP_PACKET_FILTER_IPV4_REMOTE_ADDRESS_TYPE:
pf->rule.ipv4_remote = 1;
pf->rule.ip.remote.addr[0] = tft->pf[i].component[j].ipv4.addr;
pf->rule.ip.remote.mask[0] = tft->pf[i].component[j].ipv4.mask;
break;
case GTP_PACKET_FILTER_IPV4_LOCAL_ADDRESS_TYPE:
pf->rule.ipv4_local = 1;
pf->rule.ip.local.addr[0] = tft->pf[i].component[j].ipv4.addr;
pf->rule.ip.local.mask[0] = tft->pf[i].component[j].ipv4.mask;
break;
case GTP_PACKET_FILTER_IPV6_REMOTE_ADDRESS_TYPE:
pf->rule.ipv6_remote = 1;
memcpy(pf->rule.ip.remote.addr,
tft->pf[i].component[j].ipv6_mask.addr,
sizeof(pf->rule.ip.remote.addr));
memcpy(pf->rule.ip.remote.mask,
tft->pf[i].component[j].ipv6_mask.mask,
sizeof(pf->rule.ip.remote.mask));
break;
case GTP_PACKET_FILTER_IPV6_REMOTE_ADDRESS_PREFIX_LENGTH_TYPE:
pf->rule.ipv6_remote = 1;
memcpy(pf->rule.ip.remote.addr,
tft->pf[i].component[j].ipv6_mask.addr,
sizeof(pf->rule.ip.remote.addr));
n2mask((struct in6_addr *)pf->rule.ip.remote.mask,
tft->pf[i].component[j].ipv6.prefixlen);
break;
case GTP_PACKET_FILTER_IPV6_LOCAL_ADDRESS_TYPE:
pf->rule.ipv6_local = 1;
memcpy(pf->rule.ip.local.addr,
tft->pf[i].component[j].ipv6_mask.addr,
sizeof(pf->rule.ip.local.addr));
memcpy(pf->rule.ip.local.mask,
tft->pf[i].component[j].ipv6_mask.mask,
sizeof(pf->rule.ip.local.mask));
break;
case GTP_PACKET_FILTER_IPV6_LOCAL_ADDRESS_PREFIX_LENGTH_TYPE:
pf->rule.ipv6_local = 1;
memcpy(pf->rule.ip.local.addr,
tft->pf[i].component[j].ipv6_mask.addr,
sizeof(pf->rule.ip.local.addr));
n2mask((struct in6_addr *)pf->rule.ip.local.mask,
tft->pf[i].component[j].ipv6.prefixlen);
break;
case GTP_PACKET_FILTER_SINGLE_LOCAL_PORT_TYPE:
pf->rule.port.local.low = pf->rule.port.local.high =
tft->pf[i].component[j].port.low;
break;
case GTP_PACKET_FILTER_SINGLE_REMOTE_PORT_TYPE:
pf->rule.port.remote.low = pf->rule.port.remote.high =
tft->pf[i].component[j].port.low;
break;
case GTP_PACKET_FILTER_LOCAL_PORT_RANGE_TYPE:
pf->rule.port.local.low = tft->pf[i].component[j].port.low;
pf->rule.port.local.high = tft->pf[i].component[j].port.high;
break;
case GTP_PACKET_FILTER_REMOTE_PORT_RANGE_TYPE:
pf->rule.port.remote.low = tft->pf[i].component[j].port.low;
pf->rule.port.remote.high = tft->pf[i].component[j].port.high;
break;
default:
ogs_error("Unknown Packet Filter Type(%d)",
tft->pf[i].component[j].type);
return OGS_ERROR;
}
}
return j;
}
void pgw_s5c_handle_bearer_resource_command(
pgw_sess_t *sess, ogs_gtp_xact_t *xact,
ogs_gtp_bearer_resource_command_t *cmd)
{
int rv;
uint8_t cause_value = 0;
ogs_gtp_header_t h;
ogs_pkbuf_t *pkbuf = NULL;
pgw_bearer_t *bearer = NULL;
int16_t decoded;
ogs_gtp_tft_t tft;
int tft_presence = 0;
int qos_presence = 0;
ogs_assert(xact);
ogs_assert(sess);
ogs_assert(cmd);
ogs_debug("[PGW] Bearer Resource Command");
ogs_debug(" SGW_S5C_TEID[0x%x] PGW_S5C_TEID[0x%x]",
sess->sgw_s5c_teid, sess->pgw_s5c_teid);
cause_value = OGS_GTP_CAUSE_REQUEST_ACCEPTED;
if (cmd->linked_eps_bearer_id.presence == 0) {
ogs_error("No Linked EPS Bearer ID");
cause_value = OGS_GTP_CAUSE_MANDATORY_IE_MISSING;
} else {
bearer = pgw_bearer_find_by_ebi(
sess, cmd->linked_eps_bearer_id.u8);
if (!bearer) {
ogs_error("No Context for Linked EPS Bearer ID[%d]",
cmd->linked_eps_bearer_id.u8);
cause_value = OGS_GTP_CAUSE_CONTEXT_NOT_FOUND;
}
}
if (cmd->procedure_transaction_id.presence == 0) {
ogs_error("No PTI");
cause_value = OGS_GTP_CAUSE_MANDATORY_IE_MISSING;
}
if (cmd->traffic_aggregate_description.presence == 0) {
ogs_error("No Traffic aggregate description(TAD)");
cause_value = OGS_GTP_CAUSE_MANDATORY_IE_MISSING;
}
if (cause_value != OGS_GTP_CAUSE_REQUEST_ACCEPTED) {
ogs_gtp_send_error_message(xact, sess ? sess->sgw_s5c_teid : 0,
OGS_GTP_BEARER_RESOURCE_FAILURE_INDICATION_TYPE, cause_value);
return;
}
ogs_assert(bearer);
decoded = ogs_gtp_parse_tft(&tft, &cmd->traffic_aggregate_description);
ogs_assert(cmd->traffic_aggregate_description.len == decoded);
if (tft.code == OGS_GTP_TFT_CODE_NO_TFT_OPERATION) {
/* No operation */
} else if (tft.code ==
OGS_GTP_TFT_CODE_REPLACE_PACKET_FILTERS_IN_EXISTING) {
int i;
for (i = 0; i < tft.num_of_packet_filter; i++) {
int num_of_comp = 0;
pgw_pf_t *pf = NULL;
pf = pgw_pf_find_by_id(bearer, tft.pf[i].identifier+1);
if (pf) {
num_of_comp = reconfigure_packet_filter(pf, &tft, i);
if (num_of_comp < 0) {
ogs_gtp_send_error_message(
xact, sess ? sess->sgw_s5c_teid : 0,
OGS_GTP_BEARER_RESOURCE_FAILURE_INDICATION_TYPE,
OGS_GTP_CAUSE_SEMANTIC_ERROR_IN_THE_TAD_OPERATION);
return;
}
}
if (num_of_comp > 0) tft_presence = 1;
}
} else if (tft.code ==
OGS_GTP_TFT_CODE_ADD_PACKET_FILTERS_TO_EXISTING_TFT) {
int i;
for (i = 0; i < tft.num_of_packet_filter; i++) {
int num_of_comp = 0;
pgw_pf_t *pf = NULL;
pf = pgw_pf_find_by_id(bearer, tft.pf[i].identifier+1);
if (!pf)
pf = pgw_pf_add(bearer, tft.pf[i].precedence);
ogs_assert(pf);
num_of_comp = reconfigure_packet_filter(pf, &tft, i);
if (num_of_comp < 0) {
ogs_gtp_send_error_message(
xact, sess ? sess->sgw_s5c_teid : 0,
OGS_GTP_BEARER_RESOURCE_FAILURE_INDICATION_TYPE,
OGS_GTP_CAUSE_SEMANTIC_ERROR_IN_THE_TAD_OPERATION);
return;
}
if (num_of_comp > 0) tft_presence = 1;
}
} else if (tft.code ==
OGS_GTP_TFT_CODE_DELETE_PACKET_FILTERS_FROM_EXISTING) {
/* TODO */
ogs_gtp_send_error_message(xact, sess ? sess->sgw_s5c_teid : 0,
OGS_GTP_BEARER_RESOURCE_FAILURE_INDICATION_TYPE,
OGS_GTP_CAUSE_SERVICE_NOT_SUPPORTED);
return;
}
if (cmd->flow_quality_of_service.presence) {
ogs_gtp_flow_qos_t flow_qos;
decoded = ogs_gtp_parse_flow_qos(
&flow_qos, &cmd->flow_quality_of_service);
ogs_assert(cmd->flow_quality_of_service.len == decoded);
bearer->qos.mbr.uplink = flow_qos.ul_mbr;
bearer->qos.mbr.downlink = flow_qos.dl_mbr;
bearer->qos.gbr.uplink = flow_qos.ul_gbr;
bearer->qos.gbr.downlink = flow_qos.dl_gbr;
qos_presence = 1;
}
if (tft_presence == 0 && qos_presence == 0) {
/* No modification */
ogs_gtp_send_error_message(xact, sess ? sess->sgw_s5c_teid : 0,
OGS_GTP_BEARER_RESOURCE_FAILURE_INDICATION_TYPE,
OGS_GTP_CAUSE_SERVICE_NOT_SUPPORTED);
return;
}
memset(&h, 0, sizeof(ogs_gtp_header_t));
h.type = OGS_GTP_UPDATE_BEARER_REQUEST_TYPE;
h.teid = sess->sgw_s5c_teid;
pkbuf = pgw_s5c_build_update_bearer_request(
h.type, bearer, cmd->procedure_transaction_id.u8,
tft_presence, &tft, qos_presence);
ogs_expect_or_return(pkbuf);
rv = ogs_gtp_xact_update_tx(xact, &h, pkbuf);
ogs_expect_or_return(rv == OGS_OK);
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
}
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