Robert Schmidt
659a81997b
Handle IPv6 (and IPv4v6) PDU sessions by correctly instructing nas_config() to set up the interface with provided IP addresses. Note that as of now, IPv6 PDU sessions have not been fully tested. Remove a useless assert at the gNB; to my understanding the gNB does not care about the IP session type (at least for IP), as it just transparently tunnels the IP packets from/to GTP. I added a comment in the code where to change to request a PDU session different from IPv4. Currently it is hardcoded to IPv4, and it seems that a default OAI 5GC config would reject a PDU session type different from IPv4.
227 lines
8.6 KiB
C
227 lines
8.6 KiB
C
/*
|
|
* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership.
|
|
* The OpenAirInterface Software Alliance licenses this file to You under
|
|
* the OAI Public License, Version 1.1 (the "License"); you may not use this file
|
|
* except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.openairinterface.org/?page_id=698
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*-------------------------------------------------------------------------------
|
|
* For more information about the OpenAirInterface (OAI) Software Alliance:
|
|
* contact@openairinterface.org
|
|
*/
|
|
|
|
#include "PduSessionEstablishmentAccept.h"
|
|
#include "common/utils/LOG/log.h"
|
|
#include "nr_nas_msg_sim.h"
|
|
#include "openair2/RRC/NAS/nas_config.h"
|
|
#include "openair2/SDAP/nr_sdap/nr_sdap.h"
|
|
|
|
static uint16_t getShort(uint8_t *input)
|
|
{
|
|
uint16_t tmp16;
|
|
memcpy(&tmp16, input, sizeof(tmp16));
|
|
return htons(tmp16);
|
|
}
|
|
|
|
static int capture_ipv4_addr(const uint8_t *addr, char *ip, size_t len)
|
|
{
|
|
return snprintf(ip, len, "%d.%d.%d.%d", addr[0], addr[1], addr[2], addr[3]);
|
|
}
|
|
|
|
static int capture_ipv6_addr(const uint8_t *addr, char *ip, size_t len)
|
|
{
|
|
// 24.501 Sec 9.11.4.10: "an interface identifier for the IPv6 link local
|
|
// address": link local starts with fe80::, and only the last 64bits are
|
|
// given (middle is zero)
|
|
return snprintf(ip,
|
|
len,
|
|
"fe80::%02x%02x:%02x%02x:%02x%02x:%02x%02x",
|
|
addr[0],
|
|
addr[1],
|
|
addr[2],
|
|
addr[3],
|
|
addr[4],
|
|
addr[5],
|
|
addr[6],
|
|
addr[7]);
|
|
}
|
|
|
|
void capture_pdu_session_establishment_accept_msg(uint8_t *buffer, uint32_t msg_length)
|
|
{
|
|
security_protected_nas_5gs_msg_t sec_nas_hdr;
|
|
security_protected_plain_nas_5gs_msg_t sec_nas_msg;
|
|
pdu_session_establishment_accept_msg_t psea_msg;
|
|
uint8_t *curPtr = buffer;
|
|
sec_nas_hdr.epd = *curPtr++;
|
|
sec_nas_hdr.sht = *curPtr++;
|
|
uint32_t tmp;
|
|
memcpy(&tmp, buffer, sizeof(tmp));
|
|
sec_nas_hdr.mac = htonl(tmp);
|
|
curPtr += sizeof(sec_nas_hdr.mac);
|
|
sec_nas_hdr.sqn = *curPtr++;
|
|
sec_nas_msg.epd = *curPtr++;
|
|
sec_nas_msg.sht = *curPtr++;
|
|
sec_nas_msg.msg_type = *curPtr++;
|
|
sec_nas_msg.payload_type = *curPtr++;
|
|
sec_nas_msg.payload_len = getShort(curPtr);
|
|
curPtr += sizeof(sec_nas_msg.payload_len);
|
|
/* Mandatory Presence IEs */
|
|
psea_msg.epd = *curPtr++;
|
|
psea_msg.pdu_id = *curPtr++;
|
|
psea_msg.pti = *curPtr++;
|
|
psea_msg.msg_type = *curPtr++;
|
|
psea_msg.pdu_type = *curPtr & 0x0f;
|
|
psea_msg.ssc_mode = (*curPtr++ & 0xf0) >> 4;
|
|
psea_msg.qos_rules.length = getShort(curPtr);
|
|
curPtr += sizeof(psea_msg.qos_rules.length);
|
|
/* Supports the capture of only one QoS Rule, it should be changed for multiple QoS Rules */
|
|
qos_rule_t qos_rule;
|
|
qos_rule.id = *curPtr++;
|
|
qos_rule.length = getShort(curPtr);
|
|
curPtr += sizeof(qos_rule.length);
|
|
qos_rule.oc = (*(curPtr)&0xE0) >> 5;
|
|
qos_rule.dqr = (*(curPtr)&0x10) >> 4;
|
|
qos_rule.nb_pf = *curPtr++ & 0x0F;
|
|
|
|
if(qos_rule.nb_pf) {
|
|
packet_filter_t pf;
|
|
|
|
if(qos_rule.oc == ROC_CREATE_NEW_QOS_RULE ||
|
|
qos_rule.oc == ROC_MODIFY_QOS_RULE_ADD_PF ||
|
|
qos_rule.oc == ROC_MODIFY_QOS_RULE_REPLACE_PF) {
|
|
pf.pf_type.type_1.pf_dir = (*curPtr & 0x30) >> 4;
|
|
pf.pf_type.type_1.pf_id = *curPtr++ & 0x0F;
|
|
pf.pf_type.type_1.length = *curPtr++;
|
|
curPtr += (qos_rule.nb_pf * pf.pf_type.type_1.length); /* Ommit the Packet filter List */
|
|
} else if (qos_rule.oc == ROC_MODIFY_QOS_RULE_DELETE_PF) {
|
|
curPtr += qos_rule.nb_pf;
|
|
}
|
|
}
|
|
|
|
qos_rule.prcd = *curPtr++;
|
|
qos_rule.qfi = *curPtr++;
|
|
psea_msg.sess_ambr.length = *curPtr++;
|
|
curPtr += psea_msg.sess_ambr.length; /* Ommit the Seassion-AMBR */
|
|
|
|
/* Optional Presence IEs */
|
|
while (curPtr < buffer + msg_length) {
|
|
uint8_t psea_iei = *curPtr++;
|
|
switch (psea_iei) {
|
|
case IEI_5GSM_CAUSE: /* Ommited */
|
|
LOG_T(NAS, "PDU SESSION ESTABLISHMENT ACCEPT - Received 5GSM Cause IEI\n");
|
|
curPtr++;
|
|
break;
|
|
|
|
case IEI_PDU_ADDRESS:
|
|
LOG_T(NAS, "PDU SESSION ESTABLISHMENT ACCEPT - Received PDU Address IE\n");
|
|
psea_msg.pdu_addr_ie.pdu_length = *curPtr++;
|
|
psea_msg.pdu_addr_ie.pdu_type = *curPtr++;
|
|
|
|
uint8_t *addr = psea_msg.pdu_addr_ie.pdu_addr_oct;
|
|
if (psea_msg.pdu_addr_ie.pdu_type == PDU_SESSION_TYPE_IPV4) {
|
|
for (int i = 0; i < 4; ++i)
|
|
addr[i] = *curPtr++;
|
|
char ip[20];
|
|
capture_ipv4_addr(&addr[0], ip, sizeof(ip));
|
|
nas_config(1, ip, NULL, "oaitun_ue");
|
|
setup_ue_ipv4_route(1, ip, "oaitun_ue");
|
|
} else if (psea_msg.pdu_addr_ie.pdu_type == PDU_SESSION_TYPE_IPV6) {
|
|
for (int i = 0; i < 8; ++i)
|
|
addr[i] = *curPtr++;
|
|
char ipv6[40];
|
|
capture_ipv6_addr(addr, ipv6, sizeof(ipv6));
|
|
nas_config(1, NULL, ipv6, "oaitun_ue");
|
|
} else if (psea_msg.pdu_addr_ie.pdu_type == PDU_SESSION_TYPE_IPV4V6) {
|
|
// 24.501 Sec 9.11.4.10: "If the PDU session type value indicates
|
|
// IPv4v6, the PDU address information in octet 4 to octet 11
|
|
// contains an interface identifier for the IPv6 link local address
|
|
// and in octet 12 to octet 15 contains an IPv4 address."
|
|
for (int i = 0; i < 12; ++i)
|
|
addr[i] = *curPtr++;
|
|
char ipv6[40];
|
|
capture_ipv6_addr(addr, ipv6, sizeof(ipv6));
|
|
char ipv4[20];
|
|
capture_ipv4_addr(&addr[8], ipv4, sizeof(ipv4));
|
|
nas_config(1, ipv4, ipv6, "oaitun_ue");
|
|
setup_ue_ipv4_route(1, ipv4, "oaitun_ue");
|
|
} else {
|
|
LOG_E(NAS, "unknown/unhandled PDU session establishment accept PDU type %d\n", psea_msg.pdu_addr_ie.pdu_type);
|
|
curPtr += psea_msg.pdu_addr_ie.pdu_length;
|
|
}
|
|
break;
|
|
|
|
case IEI_RQ_TIMER_VALUE: /* Ommited */
|
|
LOG_T(NAS, "PDU SESSION ESTABLISHMENT ACCEPT - Received RQ timer value IE\n");
|
|
curPtr++; /* TS 24.008 10.5.7.3 */
|
|
break;
|
|
|
|
case IEI_SNSSAI: /* Ommited */
|
|
LOG_T(NAS, "PDU SESSION ESTABLISHMENT ACCEPT - Received S-NSSAI IE\n");
|
|
uint8_t snssai_length = *curPtr;
|
|
curPtr += (snssai_length + sizeof(snssai_length));
|
|
break;
|
|
|
|
case IEI_ALWAYSON_PDU: /* Ommited */
|
|
LOG_T(NAS, "PDU SESSION ESTABLISHMENT ACCEPT - Received Always-on PDU Session indication IE\n");
|
|
curPtr++;
|
|
break;
|
|
|
|
case IEI_MAPPED_EPS: /* Ommited */
|
|
LOG_T(NAS, "PDU SESSION ESTABLISHMENT ACCEPT - Received Mapped EPS bearer context IE\n");
|
|
uint16_t mapped_eps_length = getShort(curPtr);
|
|
curPtr += mapped_eps_length;
|
|
break;
|
|
|
|
case IEI_EAP_MSG: /* Ommited */
|
|
LOG_T(NAS, "PDU SESSION ESTABLISHMENT ACCEPT - Received EAP message IE\n");
|
|
uint16_t eap_length = getShort(curPtr);
|
|
curPtr += (eap_length + sizeof(eap_length));
|
|
break;
|
|
|
|
case IEI_AUTH_QOS_DESC: /* Ommited */
|
|
LOG_T(NAS, "PDU SESSION ESTABLISHMENT ACCEPT - Received Authorized QoS flow descriptions IE\n");
|
|
psea_msg.qos_fd_ie.length = getShort(curPtr);
|
|
curPtr += (psea_msg.qos_fd_ie.length + sizeof(psea_msg.qos_fd_ie.length));
|
|
break;
|
|
|
|
case IEI_EXT_CONF_OPT: /* Ommited */
|
|
LOG_T(NAS, "PDU SESSION ESTABLISHMENT ACCEPT - Received Extended protocol configuration options IE\n");
|
|
psea_msg.ext_pp_ie.length = getShort(curPtr);
|
|
curPtr += (psea_msg.ext_pp_ie.length + sizeof(psea_msg.ext_pp_ie.length));
|
|
break;
|
|
|
|
case IEI_DNN:
|
|
LOG_T(NAS, "PDU SESSION ESTABLISHMENT ACCEPT - Received DNN IE\n");
|
|
psea_msg.dnn_ie.dnn_length = *curPtr++;
|
|
char apn[APN_MAX_LEN];
|
|
|
|
if(psea_msg.dnn_ie.dnn_length <= APN_MAX_LEN &&
|
|
psea_msg.dnn_ie.dnn_length >= APN_MIN_LEN) {
|
|
memcpy(apn, curPtr, psea_msg.dnn_ie.dnn_length);
|
|
LOG_T(NAS, "PDU SESSION ESTABLISHMENT ACCEPT - APN: %s\n", apn);
|
|
} else
|
|
LOG_E(NAS, "PDU SESSION ESTABLISHMENT ACCEPT - DNN IE has invalid length\n");
|
|
|
|
curPtr = buffer + msg_length; // we force stop processing
|
|
break;
|
|
|
|
default:
|
|
LOG_T(NAS, "PDU SESSION ESTABLISHMENT ACCEPT - Not known IE\n");
|
|
curPtr = buffer + msg_length; // we force stop processing
|
|
break;
|
|
}
|
|
}
|
|
|
|
set_qfi_pduid(qos_rule.qfi, psea_msg.pdu_id);
|
|
return;
|
|
}
|