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openairinterface5g/openair3/ocp-gtpu/gtp_itf.cpp
T
Robert Schmidt 986b212fe9 GTP: fix memory leak when socket binding fails 
Avoid leaking memory upon failed socket binding by calling
freeaddrinfo() before exiting in error cases.

Fixes leak:

    Direct leak of 64 byte(s) in 1 object(s) allocated from:
        #0 0x0000004ac038 in malloc (/home/richie/oai/cmake_targets/ran_build/build/nr-softmodem+0x4ac038) (BuildId: 875d6e5bc54d7c89bdcf151452f12703cb6fd110)
        #1 0x7f0fdd92e2a6 in getaddrinfo (/lib64/libc.so.6+0x1202a6) (BuildId: 2b3c02fe7e4d3811767175b6f323692a10a4e116)
        #2 0x00000043d7ad in getaddrinfo (/home/richie/oai/cmake_targets/ran_build/build/nr-softmodem+0x43d7ad) (BuildId: 875d6e5bc54d7c89bdcf151452f12703cb6fd110)
        #3 0x000000700c73 in udpServerSocket(openAddr_s) /home/richie/oai/openair3/ocp-gtpu/gtp_itf.cpp:486:17
        #4 0x000000700c73 in gtpv1Init /home/richie/oai/openair3/ocp-gtpu/gtp_itf.cpp:546:10
        #5 0x000000c692b8 in cuup_init_n3 /home/richie/oai/openair2/E1AP/e1ap.c:744:61
        #6 0x000000549ea1 in create_gNB_tasks /home/richie/oai/executables/nr-softmodem.c:320:7
        #7 0x000000549ea1 in main /home/richie/oai/executables/nr-softmodem.c:619:15
        #8 0x7f0fdd8115f4 in __libc_start_call_main (/lib64/libc.so.6+0x35f4) (BuildId: 2b3c02fe7e4d3811767175b6f323692a10a4e116)
        #9 0x7f0fdd8116a7 in __libc_start_main@GLIBC_2.2.5 (/lib64/libc.so.6+0x36a7) (BuildId: 2b3c02fe7e4d3811767175b6f323692a10a4e116)
        #10 0x000000408524 in _start (/home/richie/oai/cmake_targets/ran_build/build/nr-softmodem+0x408524) (BuildId: 875d6e5bc54d7c89bdcf151452f12703cb6fd110)
2025-06-10 18:00:49 +02:00

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#include <map>
using namespace std;
#ifdef __cplusplus
extern "C" {
#endif
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <netdb.h>
#include "common/platform_types.h"
#include <openair3/UTILS/conversions.h>
#include "common/utils/LOG/log.h"
#include <common/utils/ocp_itti/intertask_interface.h>
#include <openair2/COMMON/gtpv1_u_messages_types.h>
#include <openair3/ocp-gtpu/gtp_itf.h>
#include <openair2/LAYER2/PDCP_v10.1.0/pdcp.h>
#include <openair2/LAYER2/nr_pdcp/nr_pdcp_oai_api.h>
#include <openair2/LAYER2/nr_rlc/nr_rlc_oai_api.h>
#include "openair2/SDAP/nr_sdap/nr_sdap.h"
#include "sim.h"
#pragma pack(1)
typedef struct Gtpv1uMsgHeader {
uint8_t PN:1;
uint8_t S:1;
uint8_t E:1;
uint8_t spare:1;
uint8_t PT:1;
uint8_t version:3;
uint8_t msgType;
uint16_t msgLength;
teid_t teid;
} __attribute__((packed)) Gtpv1uMsgHeaderT;
//TS 38.425, Figure 5.5.2.2-1
typedef struct DlDataDeliveryStatus_flags {
uint8_t LPR:1; //Lost packet report
uint8_t FFI:1; //Final Frame Ind
uint8_t deliveredPdcpSn:1; //Highest Delivered NR PDCP SN Ind
uint8_t transmittedPdcpSn:1; //Highest Transmitted NR PDCP SN Ind
uint8_t pduType:4; //PDU type
uint8_t CR:1; //Cause Report
uint8_t deliveredReTxPdcpSn:1; //Delivered retransmitted NR PDCP SN Ind
uint8_t reTxPdcpSn:1; //Retransmitted NR PDCP SN Ind
uint8_t DRI:1; //Data Rate Indication
uint8_t deliveredPdcpSnRange:1; //Delivered NR PDCP SN Range Ind
uint8_t spare:3;
uint32_t drbBufferSize; //Desired buffer size for the data radio bearer
} __attribute__((packed)) DlDataDeliveryStatus_flagsT;
typedef struct Gtpv1uMsgHeaderOptFields {
uint8_t seqNum1Oct;
uint8_t seqNum2Oct;
uint8_t NPDUNum;
uint8_t NextExtHeaderType;
} __attribute__((packed)) Gtpv1uMsgHeaderOptFieldsT;
#define DL_PDU_SESSION_INFORMATION 0
#define UL_PDU_SESSION_INFORMATION 1
typedef struct PDUSessionContainer {
uint8_t spare:4;
uint8_t PDU_type:4;
uint8_t QFI:6;
uint8_t Reflective_QoS_activation:1;
uint8_t Paging_Policy_Indicator:1;
} __attribute__((packed)) PDUSessionContainerT;
typedef struct Gtpv1uExtHeader {
uint8_t ExtHeaderLen;
PDUSessionContainerT pdusession_cntr;
uint8_t NextExtHeaderType;
}__attribute__((packed)) Gtpv1uExtHeaderT;
#pragma pack()
// TS 29.281, fig 5.2.1-3
#define PDU_SESSION_CONTAINER (0x85)
#define NR_RAN_CONTAINER (0x84)
// TS 29.281, 5.2.1
#define EXT_HDR_LNTH_OCTET_UNITS (4)
#define NO_MORE_EXT_HDRS (0)
// TS 29.060, table 7.1 defines the possible message types
// here are all the possible messages (3GPP R16)
#define GTP_ECHO_REQ (1)
#define GTP_ECHO_RSP (2)
#define GTP_ERROR_INDICATION (26)
#define GTP_SUPPORTED_EXTENSION_HEADER_INDICATION (31)
#define GTP_END_MARKER (254)
#define GTP_GPDU (255)
typedef struct gtpv1u_bearer_s {
/* TEID used in dl and ul */
teid_t teid_incoming; ///< eNB TEID
teid_t teid_outgoing; ///< Remote TEID
in_addr_t outgoing_ip_addr;
struct in6_addr outgoing_ip6_addr;
tcp_udp_port_t outgoing_port;
uint16_t seqNum;
uint8_t npduNum;
int outgoing_qfi;
} gtpv1u_bearer_t;
typedef struct {
map<ue_id_t, gtpv1u_bearer_t> bearers;
teid_t outgoing_teid;
} teidData_t;
typedef struct {
ue_id_t ue_id;
ebi_t incoming_rb_id;
gtpCallback callBack;
teid_t outgoing_teid;
gtpCallbackSDAP callBackSDAP;
int pdusession_id;
} ueidData_t;
class gtpEndPoint {
public:
openAddr_t addr;
uint8_t foundAddr[20];
int foundAddrLen;
int ipVersion;
map<uint64_t, teidData_t> ue2te_mapping;
// we use the same port number for source and destination address
// this allow using non standard gtp port number (different from 2152)
// and so, for example tu run 4G and 5G cores on one system
tcp_udp_port_t get_dstport() {
return (tcp_udp_port_t)atol(addr.destinationService);
}
};
class gtpEndPoints {
public:
pthread_mutex_t gtp_lock=PTHREAD_MUTEX_INITIALIZER;
// the instance id will be the Linux socket handler, as this is uniq
map<uint64_t, gtpEndPoint> instances;
map<uint64_t, ueidData_t> te2ue_mapping;
gtpEndPoints() {
unsigned int seed;
fill_random(&seed, sizeof(seed));
srandom(seed);
}
~gtpEndPoints() {
// automatically close all sockets on quit
for (const auto &p : instances)
close(p.first);
}
};
static gtpEndPoints globGtp;
// note TEid 0 is reserved for specific usage: echo req/resp, error and supported extensions
static teid_t gtpv1uNewTeid(void) {
#ifdef GTPV1U_LINEAR_TEID_ALLOCATION
g_gtpv1u_teid = g_gtpv1u_teid + 1;
return g_gtpv1u_teid;
#else
return random() + random() % (RAND_MAX - 1) + 1;
#endif
}
instance_t legacyInstanceMapping=0;
#define compatInst(a) ((a)==0 || (a)==INSTANCE_DEFAULT ? legacyInstanceMapping:a)
#define getInstRetVoid(insT) \
auto instChk=globGtp.instances.find(compatInst(insT)); \
if (instChk == globGtp.instances.end()) { \
LOG_E(GTPU,"try to get a gtp-u not existing output\n"); \
pthread_mutex_unlock(&globGtp.gtp_lock); \
return; \
} \
gtpEndPoint * inst=&instChk->second;
#define getInstRetInt(insT) \
auto instChk=globGtp.instances.find(compatInst(insT)); \
if (instChk == globGtp.instances.end()) { \
LOG_E(GTPU,"try to get a gtp-u not existing output\n"); \
pthread_mutex_unlock(&globGtp.gtp_lock); \
return GTPNOK; \
} \
gtpEndPoint * inst=&instChk->second;
#define getUeRetVoid(insT, Ue) \
auto ptrUe=insT->ue2te_mapping.find(Ue); \
\
if ( ptrUe==insT->ue2te_mapping.end() ) { \
LOG_E(GTPU, "[%ld] %s failed: while getting ue id %ld in hashtable ue_mapping\n", instance, __func__, ue_id); \
pthread_mutex_unlock(&globGtp.gtp_lock); \
return; \
}
#define getUeRetInt(insT, Ue) \
auto ptrUe=insT->ue2te_mapping.find(Ue); \
\
if ( ptrUe==insT->ue2te_mapping.end() ) { \
LOG_E(GTPU, "[%ld] %s failed: while getting ue id %ld in hashtable ue_mapping\n", instance, __func__, ue_id); \
pthread_mutex_unlock(&globGtp.gtp_lock); \
return GTPNOK; \
}
#define HDR_MAX 256 // 256 is supposed to be larger than any gtp header
static int gtpv1uCreateAndSendMsg(int h,
uint32_t peerIp,
uint16_t peerPort,
int msgType,
teid_t teid,
uint8_t *Msg,
int msgLen,
bool seqNumFlag,
bool npduNumFlag,
int seqNum,
int npduNum,
int extHdrType,
uint8_t *extensionHeader_buffer,
uint8_t extensionHeader_length) {
LOG_D(GTPU, "Peer IP:%u peer port:%u outgoing teid:%u \n", peerIp, peerPort, teid);
DevAssert(msgLen + HDR_MAX < 65536); // maximum size of UDP packet
uint8_t buffer[msgLen+HDR_MAX];
uint8_t *curPtr=buffer;
Gtpv1uMsgHeaderT *msgHdr = (Gtpv1uMsgHeaderT *)buffer ;
// N should be 0 for us (it was used only in 2G and 3G)
msgHdr->PN=npduNumFlag;
msgHdr->S=seqNumFlag;
msgHdr->E = extHdrType != NO_MORE_EXT_HDRS;
msgHdr->spare=0;
//PT=0 is for GTP' TS 32.295 (charging)
msgHdr->PT=1;
msgHdr->version=1;
msgHdr->msgType=msgType;
msgHdr->teid=htonl(teid);
curPtr+=sizeof(Gtpv1uMsgHeaderT);
if (seqNumFlag || (extHdrType != NO_MORE_EXT_HDRS) || npduNumFlag) {
*(uint16_t *)curPtr = seqNumFlag ? seqNum : 0x0000;
curPtr+=sizeof(uint16_t);
*(uint8_t *)curPtr = npduNumFlag ? npduNum : 0x00;
curPtr++;
*(uint8_t *)curPtr = extHdrType;
curPtr++;
}
// Bug: if there is more than one extension, infinite loop on extensionHeader_buffer
while (extHdrType != NO_MORE_EXT_HDRS) {
if (extensionHeader_length > 0) {
memcpy(curPtr, extensionHeader_buffer, extensionHeader_length);
curPtr += extensionHeader_length;
LOG_D(GTPU, "Extension Header for DDD added. The length is: %d, extension header type is: %x \n", extensionHeader_length, *((uint8_t *)(buffer + 11)));
extHdrType = extensionHeader_buffer[extensionHeader_length - 1];
LOG_D(GTPU, "Next extension header type is: %x \n", *((uint8_t *)(buffer + 11)));
} else {
LOG_W(GTPU, "Extension header type not supported, returning... \n");
}
}
if (Msg!= NULL){
memcpy(curPtr, Msg, msgLen);
curPtr+=msgLen;
}
msgHdr->msgLength = htons(curPtr-(buffer+sizeof(Gtpv1uMsgHeaderT)));
AssertFatal(curPtr-(buffer+msgLen) < HDR_MAX, "fixed max size of all headers too short");
// Fix me: add IPv6 support, using flag ipVersion
struct sockaddr_in to= {0};
to.sin_family = AF_INET;
to.sin_port = htons(peerPort);
to.sin_addr.s_addr = peerIp ;
LOG_D(GTPU,"sending packet size: %ld to %s\n",curPtr-buffer, inet_ntoa(to.sin_addr) );
int ret;
if ((ret=sendto(h, (void *)buffer, curPtr-buffer, 0,(struct sockaddr *)&to, sizeof(to) )) != curPtr-buffer ) {
LOG_E(GTPU, "[SD %d] Failed to send data to " IPV4_ADDR " on port %d, buffer size %lu, ret: %d, errno: %d\n",
h, IPV4_ADDR_FORMAT(peerIp), peerPort, curPtr-buffer, ret, errno);
return GTPNOK;
}
return !GTPNOK;
}
void gtpv1uSendDirect(instance_t instance,
ue_id_t ue_id,
int bearer_id,
uint8_t *buf,
size_t len,
bool seqNumFlag,
bool npduNumFlag)
{
pthread_mutex_lock(&globGtp.gtp_lock);
getInstRetVoid(compatInst(instance));
getUeRetVoid(inst, ue_id);
auto ptr2 = ptrUe->second.bearers.find(bearer_id);
if (ptr2 == ptrUe->second.bearers.end()) {
LOG_E(GTPU, "[%ld] GTP-U instance: sending a packet to a non existant UE:RAB: %lx/%x\n", instance, ue_id, bearer_id);
pthread_mutex_unlock(&globGtp.gtp_lock);
return;
}
LOG_D(GTPU,
"[%ld] sending a packet to UE:RAB:teid %lx/%x/%x, len %lu, oldseq %d, oldnum %d\n",
instance,
ue_id,
bearer_id,
ptr2->second.teid_outgoing,
len,
ptr2->second.seqNum,
ptr2->second.npduNum);
if (seqNumFlag)
ptr2->second.seqNum++;
if (npduNumFlag)
ptr2->second.npduNum++;
// copy to release the mutex
gtpv1u_bearer_t tmp = ptr2->second;
pthread_mutex_unlock(&globGtp.gtp_lock);
if (tmp.outgoing_qfi != -1) {
Gtpv1uExtHeaderT ext = {0};
ext.ExtHeaderLen = 1; // in quad bytes EXT_HDR_LNTH_OCTET_UNITS
ext.pdusession_cntr.spare = 0;
ext.pdusession_cntr.PDU_type = UL_PDU_SESSION_INFORMATION;
ext.pdusession_cntr.QFI = tmp.outgoing_qfi;
ext.pdusession_cntr.Reflective_QoS_activation = false;
ext.pdusession_cntr.Paging_Policy_Indicator = false;
ext.NextExtHeaderType = NO_MORE_EXT_HDRS;
gtpv1uCreateAndSendMsg(compatInst(instance),
tmp.outgoing_ip_addr,
tmp.outgoing_port,
GTP_GPDU,
tmp.teid_outgoing,
buf,
len,
seqNumFlag,
npduNumFlag,
tmp.seqNum,
tmp.npduNum,
PDU_SESSION_CONTAINER,
(uint8_t *)&ext,
sizeof(ext));
} else {
gtpv1uCreateAndSendMsg(compatInst(instance),
tmp.outgoing_ip_addr,
tmp.outgoing_port,
GTP_GPDU,
tmp.teid_outgoing,
buf,
len,
seqNumFlag,
npduNumFlag,
tmp.seqNum,
tmp.npduNum,
NO_MORE_EXT_HDRS,
NULL,
0);
}
}
static void fillDlDeliveryStatusReport(extensionHeader_t *extensionHeader, uint32_t RLC_buffer_availability, uint32_t NR_PDCP_PDU_SN){
extensionHeader->buffer[0] = (1+sizeof(DlDataDeliveryStatus_flagsT)+(NR_PDCP_PDU_SN>0?3:0)+(NR_PDCP_PDU_SN>0?1:0)+1)/4;
DlDataDeliveryStatus_flagsT DlDataDeliveryStatus;
DlDataDeliveryStatus.deliveredPdcpSn = 0;
DlDataDeliveryStatus.transmittedPdcpSn= NR_PDCP_PDU_SN>0?1:0;
DlDataDeliveryStatus.pduType = 1;
DlDataDeliveryStatus.drbBufferSize = htonl(RLC_buffer_availability);
memcpy(extensionHeader->buffer+1, &DlDataDeliveryStatus, sizeof(DlDataDeliveryStatus_flagsT));
uint8_t offset = sizeof(DlDataDeliveryStatus_flagsT)+1;
if(NR_PDCP_PDU_SN>0){
extensionHeader->buffer[offset] = (NR_PDCP_PDU_SN >> 16) & 0xff;
extensionHeader->buffer[offset+1] = (NR_PDCP_PDU_SN >> 8) & 0xff;
extensionHeader->buffer[offset+2] = NR_PDCP_PDU_SN & 0xff;
LOG_D(GTPU, "Octets reporting NR_PDCP_PDU_SN, extensionHeader->buffer[offset]: %u, extensionHeader->buffer[offset+1]:%u, extensionHeader->buffer[offset+2]:%u \n", extensionHeader->buffer[offset], extensionHeader->buffer[offset+1],extensionHeader->buffer[offset+2]);
extensionHeader->buffer[offset+3] = 0x00; //Padding octet
offset = offset+3;
}
extensionHeader->buffer[offset] = 0x00; //No more extension headers
/*Total size of DDD_status PDU = size of mandatory part +
* 3 octets for highest transmitted/delivered PDCP SN +
* 1 octet for padding + 1 octet for next extension header type,
* according to TS 38.425: Fig. 5.5.2.2-1 and section 5.5.3.24*/
extensionHeader->length = 1+sizeof(DlDataDeliveryStatus_flagsT)+
(NR_PDCP_PDU_SN>0?3:0)+
(NR_PDCP_PDU_SN>0?1:0)+1;
}
static void gtpv1uSendDlDeliveryStatus(instance_t instance, gtpv1u_DU_buffer_report_req_t *req){
ue_id_t ue_id=req->ue_id;
int bearer_id=req->pdusession_id;
pthread_mutex_lock(&globGtp.gtp_lock);
getInstRetVoid(compatInst(instance));
getUeRetVoid(inst, ue_id);
auto ptr2=ptrUe->second.bearers.find(bearer_id);
if ( ptr2 == ptrUe->second.bearers.end() ) {
LOG_D(GTPU,"GTP-U instance: %ld sending a packet to a non existant UE ID:RAB: %lu/%x\n", instance, ue_id, bearer_id);
pthread_mutex_unlock(&globGtp.gtp_lock);
return;
}
extensionHeader_t *extensionHeader;
extensionHeader = (extensionHeader_t *) calloc(1, sizeof(extensionHeader_t));
fillDlDeliveryStatusReport(extensionHeader, req->buffer_availability,0);
LOG_I(GTPU,"[%ld] GTP-U sending DL Data Delivery status to UE ID:RAB:teid %lu/%x/%x, oldseq %d, oldnum %d\n",
instance, ue_id, bearer_id,ptr2->second.teid_outgoing, ptr2->second.seqNum,ptr2->second.npduNum );
// copy to release the mutex
gtpv1u_bearer_t tmp=ptr2->second;
pthread_mutex_unlock(&globGtp.gtp_lock);
gtpv1uCreateAndSendMsg(
compatInst(instance), tmp.outgoing_ip_addr, tmp.outgoing_port, GTP_GPDU, tmp.teid_outgoing, NULL, 0, false, false, 0, 0, NR_RAN_CONTAINER, extensionHeader->buffer, extensionHeader->length);
}
static void gtpv1uEndTunnel(instance_t instance, gtpv1u_enb_end_marker_req_t *req)
{
ue_id_t ue_id=req->rnti;
int bearer_id=req->rab_id;
pthread_mutex_lock(&globGtp.gtp_lock);
getInstRetVoid(compatInst(instance));
getUeRetVoid(inst, ue_id);
auto ptr2=ptrUe->second.bearers.find(bearer_id);
if ( ptr2 == ptrUe->second.bearers.end() ) {
LOG_E(GTPU,"[%ld] GTP-U sending a packet to a non existant UE:RAB: %lx/%x\n", instance, ue_id, bearer_id);
pthread_mutex_unlock(&globGtp.gtp_lock);
return;
}
LOG_D(GTPU,"[%ld] sending a end packet packet to UE:RAB:teid %lx/%x/%x\n",
instance, ue_id, bearer_id,ptr2->second.teid_outgoing);
gtpv1u_bearer_t tmp=ptr2->second;
pthread_mutex_unlock(&globGtp.gtp_lock);
Gtpv1uMsgHeaderT msgHdr;
// N should be 0 for us (it was used only in 2G and 3G)
msgHdr.PN=0;
msgHdr.S=0;
msgHdr.E=0;
msgHdr.spare=0;
//PT=0 is for GTP' TS 32.295 (charging)
msgHdr.PT=1;
msgHdr.version=1;
msgHdr.msgType=GTP_END_MARKER;
msgHdr.msgLength=htons(0);
msgHdr.teid=htonl(tmp.teid_outgoing);
// Fix me: add IPv6 support, using flag ipVersion
static struct sockaddr_in to= {0};
to.sin_family = AF_INET;
to.sin_port = htons(tmp.outgoing_port);
to.sin_addr.s_addr = tmp.outgoing_ip_addr;
char ip4[INET_ADDRSTRLEN];
//char ip6[INET6_ADDRSTRLEN];
LOG_D(GTPU,"[%ld] sending end packet to %s\n", instance, inet_ntoa(to.sin_addr) );
if (sendto(compatInst(instance), (void *)&msgHdr, sizeof(msgHdr), 0,(struct sockaddr *)&to, sizeof(to) ) != sizeof(msgHdr)) {
LOG_E(GTPU,
"[%ld] Failed to send data to %s on port %d, buffer size %lu\n",
compatInst(instance), inet_ntop(AF_INET, &tmp.outgoing_ip_addr, ip4, INET_ADDRSTRLEN), tmp.outgoing_port, sizeof(msgHdr));
}
}
static int udpServerSocket(openAddr_s addr) {
LOG_I(GTPU, "Initializing UDP for local address %s with port %s\n", addr.originHost, addr.originService);
int status;
struct addrinfo hints= {0}, *servinfo, *p;
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_flags = AI_PASSIVE;
if ((status = getaddrinfo(addr.originHost, addr.originService, &hints, &servinfo)) != 0) {
LOG_E(GTPU,"getaddrinfo error: %s\n", gai_strerror(status));
return -1;
}
int sockfd=-1;
// loop through all the results and bind to the first we can
for(p = servinfo; p != NULL; p = p->ai_next) {
if ((sockfd = socket(p->ai_family, p->ai_socktype,
p->ai_protocol)) == -1) {
LOG_W(GTPU,"socket: %s\n", strerror(errno));
continue;
}
if (bind(sockfd, p->ai_addr, p->ai_addrlen) == -1) {
close(sockfd);
LOG_W(GTPU,"bind: %s\n", strerror(errno));
continue;
} else {
// We create the gtp instance on the socket
globGtp.instances[sockfd].addr=addr;
if (p->ai_family == AF_INET) {
struct sockaddr_in *ipv4=(struct sockaddr_in *)p->ai_addr;
memcpy(globGtp.instances[sockfd].foundAddr,
&ipv4->sin_addr.s_addr, sizeof(ipv4->sin_addr.s_addr));
globGtp.instances[sockfd].foundAddrLen=sizeof(ipv4->sin_addr.s_addr);
globGtp.instances[sockfd].ipVersion=4;
break;
} else if (p->ai_family == AF_INET6) {
LOG_W(GTPU,"Local address is IP v6\n");
struct sockaddr_in6 *ipv6=(struct sockaddr_in6 *)p->ai_addr;
memcpy(globGtp.instances[sockfd].foundAddr,
&ipv6->sin6_addr.s6_addr, sizeof(ipv6->sin6_addr.s6_addr));
globGtp.instances[sockfd].foundAddrLen=sizeof(ipv6->sin6_addr.s6_addr);
globGtp.instances[sockfd].ipVersion=6;
} else
AssertFatal(false,"Local address is not IPv4 or IPv6");
}
break; // if we get here, we must have connected successfully
}
freeaddrinfo(servinfo); // all done with this structure
if (p == NULL) {
// looped off the end of the list with no successful bind
LOG_E(GTPU,"failed to bind socket: %s %s \n", addr.originHost, addr.originService);
return -1;
}
int sendbuff = 1000*1000*10;
AssertFatal(0==setsockopt(sockfd, SOL_SOCKET, SO_SNDBUF, &sendbuff, sizeof(sendbuff)),"");
LOG_D(GTPU,"[%d] Created listener for paquets to: %s:%s, send buffer size: %d\n", sockfd, addr.originHost, addr.originService,sendbuff);
return sockfd;
}
instance_t gtpv1Init(openAddr_t context) {
pthread_mutex_lock(&globGtp.gtp_lock);
int id=udpServerSocket(context);
if (id>=0) {
itti_subscribe_event_fd(TASK_GTPV1_U, id);
} else
LOG_E(GTPU,"can't create GTP-U instance\n");
pthread_mutex_unlock(&globGtp.gtp_lock);
LOG_I(GTPU, "Created gtpu instance id: %d\n", id);
return id;
}
void GtpuUpdateTunnelOutgoingAddressAndTeid(instance_t instance, ue_id_t ue_id, ebi_t bearer_id, in_addr_t newOutgoingAddr, teid_t newOutgoingTeid) {
pthread_mutex_lock(&globGtp.gtp_lock);
getInstRetVoid(compatInst(instance));
getUeRetVoid(inst, ue_id);
auto ptr2=ptrUe->second.bearers.find(bearer_id);
if ( ptr2 == ptrUe->second.bearers.end() ) {
LOG_E(GTPU,"[%ld] Update tunnel for a existing ue id %lu, but wrong bearer_id %u\n", instance, ue_id, bearer_id);
pthread_mutex_unlock(&globGtp.gtp_lock);
return;
}
ptr2->second.outgoing_ip_addr = newOutgoingAddr;
ptr2->second.teid_outgoing = newOutgoingTeid;
LOG_I(GTPU, "[%ld] Tunnel Outgoing TEID updated to %x and address to %x\n", instance, ptr2->second.teid_outgoing, ptr2->second.outgoing_ip_addr);
pthread_mutex_unlock(&globGtp.gtp_lock);
return;
}
teid_t newGtpuCreateTunnel(instance_t instance,
ue_id_t ue_id,
int incoming_bearer_id,
int outgoing_bearer_id,
teid_t outgoing_teid,
int outgoing_qfi,
transport_layer_addr_t remoteAddr,
int port,
gtpCallback callBack,
gtpCallbackSDAP callBackSDAP) {
pthread_mutex_lock(&globGtp.gtp_lock);
getInstRetInt(compatInst(instance));
auto it=inst->ue2te_mapping.find(ue_id);
if ( it != inst->ue2te_mapping.end() && it->second.bearers.find(outgoing_bearer_id) != it->second.bearers.end()) {
LOG_W(GTPU,"[%ld] Create a config for a already existing GTP tunnel (ue id %lu)\n", instance, ue_id);
inst->ue2te_mapping.erase(it);
}
teid_t incoming_teid=gtpv1uNewTeid();
while (globGtp.te2ue_mapping.find(incoming_teid) != globGtp.te2ue_mapping.end()) {
LOG_W(GTPU, "[%ld] generated a random Teid that exists, re-generating (%x)\n", instance, incoming_teid);
incoming_teid=gtpv1uNewTeid();
};
globGtp.te2ue_mapping[incoming_teid].ue_id = ue_id;
globGtp.te2ue_mapping[incoming_teid].incoming_rb_id = incoming_bearer_id;
globGtp.te2ue_mapping[incoming_teid].outgoing_teid = outgoing_teid;
globGtp.te2ue_mapping[incoming_teid].callBack = callBack;
globGtp.te2ue_mapping[incoming_teid].callBackSDAP = callBackSDAP;
globGtp.te2ue_mapping[incoming_teid].pdusession_id = (uint8_t)outgoing_bearer_id;
gtpv1u_bearer_t *tmp=&inst->ue2te_mapping[ue_id].bearers[outgoing_bearer_id];
int addrs_length_in_bytes = remoteAddr.length / 8;
switch (addrs_length_in_bytes) {
case 4:
memcpy(&tmp->outgoing_ip_addr,remoteAddr.buffer,4);
break;
case 16:
memcpy(tmp->outgoing_ip6_addr.s6_addr,remoteAddr.buffer,
16);
break;
case 20:
memcpy(&tmp->outgoing_ip_addr,remoteAddr.buffer,4);
memcpy(tmp->outgoing_ip6_addr.s6_addr,
remoteAddr.buffer+4,
16);
default:
AssertFatal(false, "SGW Address size impossible");
}
tmp->teid_incoming = incoming_teid;
tmp->outgoing_port=port;
tmp->teid_outgoing= outgoing_teid;
tmp->outgoing_qfi=outgoing_qfi;
pthread_mutex_unlock(&globGtp.gtp_lock);
char ip4[INET_ADDRSTRLEN];
char ip6[INET6_ADDRSTRLEN];
LOG_I(GTPU,
"[%ld] Created tunnel for UE ID %lu, teid for incoming: %x, teid for outgoing %x to remote IPv4: %s, IPv6 %s\n",
instance,
ue_id,
tmp->teid_incoming,
tmp->teid_outgoing,
inet_ntop(AF_INET, (void *)&tmp->outgoing_ip_addr, ip4, INET_ADDRSTRLEN),
inet_ntop(AF_INET6, (void *)&tmp->outgoing_ip6_addr.s6_addr, ip6, INET6_ADDRSTRLEN));
return incoming_teid;
}
int gtpv1u_create_s1u_tunnel(instance_t instance,
const gtpv1u_enb_create_tunnel_req_t *create_tunnel_req,
gtpv1u_enb_create_tunnel_resp_t *create_tunnel_resp,
gtpCallback callBack)
{
LOG_D(GTPU, "[%ld] Start create tunnels for UE ID %u, num_tunnels %d, sgw_S1u_teid %x\n",
instance,
create_tunnel_req->rnti,
create_tunnel_req->num_tunnels,
create_tunnel_req->sgw_S1u_teid[0]);
pthread_mutex_lock(&globGtp.gtp_lock);
getInstRetInt(compatInst(instance));
tcp_udp_port_t dstport=inst->get_dstport();
uint8_t addr[inst->foundAddrLen];
memcpy(addr, inst->foundAddr, inst->foundAddrLen);
pthread_mutex_unlock(&globGtp.gtp_lock);
for (int i = 0; i < create_tunnel_req->num_tunnels; i++) {
AssertFatal(create_tunnel_req->eps_bearer_id[i] > 4,
"From legacy code not clear, seems impossible (bearer=%d)\n",
create_tunnel_req->eps_bearer_id[i]);
int incoming_rb_id=create_tunnel_req->eps_bearer_id[i]-4;
teid_t teid = newGtpuCreateTunnel(compatInst(instance),
create_tunnel_req->rnti,
incoming_rb_id,
create_tunnel_req->eps_bearer_id[i],
create_tunnel_req->sgw_S1u_teid[i],
-1, // no pdu session in 4G
create_tunnel_req->sgw_addr[i],
dstport,
callBack,
NULL);
create_tunnel_resp->status=0;
create_tunnel_resp->rnti=create_tunnel_req->rnti;
create_tunnel_resp->num_tunnels=create_tunnel_req->num_tunnels;
create_tunnel_resp->enb_S1u_teid[i]=teid;
create_tunnel_resp->eps_bearer_id[i] = create_tunnel_req->eps_bearer_id[i];
memcpy(create_tunnel_resp->enb_addr.buffer,addr,sizeof(addr));
create_tunnel_resp->enb_addr.length= sizeof(addr);
}
return !GTPNOK;
}
int gtpv1u_update_s1u_tunnel(
const instance_t instance,
const gtpv1u_enb_create_tunnel_req_t *const create_tunnel_req,
const rnti_t prior_rnti
) {
LOG_D(GTPU, "[%ld] Start update tunnels for old RNTI %x, new RNTI %x, num_tunnels %d, sgw_S1u_teid %x, eps_bearer_id %x\n",
instance,
prior_rnti,
create_tunnel_req->rnti,
create_tunnel_req->num_tunnels,
create_tunnel_req->sgw_S1u_teid[0],
create_tunnel_req->eps_bearer_id[0]);
pthread_mutex_lock(&globGtp.gtp_lock);
getInstRetInt(compatInst(instance));
if ( inst->ue2te_mapping.find(create_tunnel_req->rnti) == inst->ue2te_mapping.end() ) {
LOG_E(GTPU,"[%ld] Update not already existing tunnel (new rnti %x, old rnti %x)\n",
instance, create_tunnel_req->rnti, prior_rnti);
}
auto it=inst->ue2te_mapping.find(prior_rnti);
if ( it != inst->ue2te_mapping.end() ) {
pthread_mutex_unlock(&globGtp.gtp_lock);
AssertFatal(false, "logic bug: update of non-existing tunnel (new ue id %u, old ue id %u)\n", create_tunnel_req->rnti, prior_rnti);
/* we don't know if we need 4G or 5G PDCP and can therefore not create a
* new tunnel */
return 0;
}
inst->ue2te_mapping[create_tunnel_req->rnti]=it->second;
inst->ue2te_mapping.erase(it);
pthread_mutex_unlock(&globGtp.gtp_lock);
return 0;
}
int gtpv1u_create_ngu_tunnel(const instance_t instance,
const gtpv1u_gnb_create_tunnel_req_t *const create_tunnel_req,
gtpv1u_gnb_create_tunnel_resp_t *const create_tunnel_resp,
gtpCallback callBack,
gtpCallbackSDAP callBackSDAP)
{
LOG_D(GTPU, "[%ld] Start create tunnels for ue id %lu, num_tunnels %d, sgw_S1u_teid %x\n",
instance,
create_tunnel_req->ue_id,
create_tunnel_req->num_tunnels,
create_tunnel_req->outgoing_teid[0]);
pthread_mutex_lock(&globGtp.gtp_lock);
getInstRetInt(compatInst(instance));
tcp_udp_port_t dstport = inst->get_dstport();
uint8_t addr[inst->foundAddrLen];
memcpy(addr, inst->foundAddr, inst->foundAddrLen);
pthread_mutex_unlock(&globGtp.gtp_lock);
for (int i = 0; i < create_tunnel_req->num_tunnels; i++) {
teid_t teid = newGtpuCreateTunnel(instance,
create_tunnel_req->ue_id,
create_tunnel_req->incoming_rb_id[i],
create_tunnel_req->pdusession_id[i],
create_tunnel_req->outgoing_teid[i],
create_tunnel_req->outgoing_qfi[i],
create_tunnel_req->dst_addr[i],
dstport,
callBack,
callBackSDAP);
create_tunnel_resp->status=0;
create_tunnel_resp->ue_id=create_tunnel_req->ue_id;
create_tunnel_resp->num_tunnels=create_tunnel_req->num_tunnels;
create_tunnel_resp->gnb_NGu_teid[i]=teid;
memcpy(create_tunnel_resp->gnb_addr.buffer,addr,sizeof(addr));
create_tunnel_resp->gnb_addr.length= sizeof(addr);
create_tunnel_resp->pdusession_id[i] = create_tunnel_req->pdusession_id[i];
}
return !GTPNOK;
}
int gtpv1u_update_ue_id(const instance_t instanceP, ue_id_t old_ue_id, ue_id_t new_ue_id)
{
pthread_mutex_lock(&globGtp.gtp_lock);
auto inst = &globGtp.instances[compatInst(instanceP)];
auto it = inst->ue2te_mapping.find(old_ue_id);
if (it == inst->ue2te_mapping.end()) {
LOG_W(GTPU, "[%ld] Update GTP tunnels for UEid: %lx, but no tunnel exits\n", instanceP, old_ue_id);
pthread_mutex_unlock(&globGtp.gtp_lock);
return GTPNOK;
}
for (unsigned i = 0; i < it->second.bearers.size(); ++i) {
teid_t incoming_teid = inst->ue2te_mapping[old_ue_id].bearers[i].teid_incoming;
if (globGtp.te2ue_mapping[incoming_teid].ue_id == old_ue_id) {
globGtp.te2ue_mapping[incoming_teid].ue_id = new_ue_id;
}
}
inst->ue2te_mapping[new_ue_id] = it->second;
inst->ue2te_mapping.erase(it);
pthread_mutex_unlock(&globGtp.gtp_lock);
LOG_I(GTPU, "[%ld] Updated tunnels from UEid %lx to UEid %lx\n", instanceP, old_ue_id, new_ue_id);
return !GTPNOK;
}
int gtpv1u_create_x2u_tunnel(
const instance_t instanceP,
const gtpv1u_enb_create_x2u_tunnel_req_t *const create_tunnel_req_pP,
gtpv1u_enb_create_x2u_tunnel_resp_t *const create_tunnel_resp_pP) {
AssertFatal( false, "to be developped\n");
}
int newGtpuDeleteOneTunnel(instance_t instance, ue_id_t ue_id, int rb_id)
{
pthread_mutex_lock(&globGtp.gtp_lock);
getInstRetInt(compatInst(instance));
map<uint64_t, teidData_t>::iterator ue_it = inst->ue2te_mapping.find(ue_id);
if (ue_it == inst->ue2te_mapping.end()) {
LOG_E(GTPU, "%s() no such UE %ld\n", __func__, ue_id);
pthread_mutex_unlock(&globGtp.gtp_lock);
return !GTPNOK;
}
map<ue_id_t, gtpv1u_bearer_t>::iterator rb_it = ue_it->second.bearers.find(rb_id);
if (rb_it == ue_it->second.bearers.end()) {
LOG_E(GTPU, "%s() UE %ld has no bearer %d, available\n", __func__, ue_id, rb_id);
pthread_mutex_unlock(&globGtp.gtp_lock);
return !GTPNOK;
}
int teid = rb_it->second.teid_incoming;
globGtp.te2ue_mapping.erase(teid);
ue_it->second.bearers.erase(rb_id);
pthread_mutex_unlock(&globGtp.gtp_lock);
LOG_I(GTPU, "Deleted tunnel TEID %d (RB %d) for ue id %ld, remaining bearers:\n", teid, rb_id, ue_id);
for (auto b: ue_it->second.bearers)
LOG_I(GTPU, "bearer %ld\n", b.first);
return !GTPNOK;
}
int newGtpuDeleteAllTunnels(instance_t instance, ue_id_t ue_id) {
LOG_D(GTPU, "[%ld] Start delete tunnels for ue id %lu\n",
instance, ue_id);
pthread_mutex_lock(&globGtp.gtp_lock);
getInstRetInt(compatInst(instance));
getUeRetInt(inst, ue_id);
int nb=0;
for (auto j=ptrUe->second.bearers.begin();
j!=ptrUe->second.bearers.end();
++j) {
globGtp.te2ue_mapping.erase(j->second.teid_incoming);
nb++;
}
inst->ue2te_mapping.erase(ptrUe);
pthread_mutex_unlock(&globGtp.gtp_lock);
LOG_I(GTPU, "[%ld] Deleted all tunnels for ue id %ld (%d tunnels deleted)\n", instance, ue_id, nb);
return !GTPNOK;
}
int gtpv1u_delete_s1u_tunnel( const instance_t instance,
const gtpv1u_enb_delete_tunnel_req_t *const req_pP) {
LOG_D(GTPU, "[%ld] Start delete tunnels for RNTI %x\n", instance, req_pP->rnti);
pthread_mutex_lock(&globGtp.gtp_lock);
auto inst = &globGtp.instances[compatInst(instance)];
auto ptrRNTI = inst->ue2te_mapping.find(req_pP->rnti);
if (ptrRNTI == inst->ue2te_mapping.end()) {
LOG_W(GTPU, "[%ld] Delete Released GTP tunnels for rnti: %x, but no tunnel exits\n", instance, req_pP->rnti);
pthread_mutex_unlock(&globGtp.gtp_lock);
return -1;
}
int nb = 0;
for (int i = 0; i < req_pP->num_erab; i++) {
auto ptr2 = ptrRNTI->second.bearers.find(req_pP->eps_bearer_id[i]);
if (ptr2 == ptrRNTI->second.bearers.end()) {
LOG_E(GTPU,
"[%ld] GTP-U instance: delete of not existing tunnel RNTI:RAB: %x/%x\n",
instance,
req_pP->rnti,
req_pP->eps_bearer_id[i]);
} else {
globGtp.te2ue_mapping.erase(ptr2->second.teid_incoming);
nb++;
}
}
if (ptrRNTI->second.bearers.size() == 0)
// no tunnels on this rnti, erase the ue entry
inst->ue2te_mapping.erase(ptrRNTI);
pthread_mutex_unlock(&globGtp.gtp_lock);
LOG_I(GTPU, "[%ld] Deleted released tunnels for RNTI %x (%d tunnels deleted)\n", instance, req_pP->rnti, nb);
return !GTPNOK;
}
// Legacy delete tunnel finish by deleting all the ue id
int gtpv1u_delete_all_s1u_tunnel(const instance_t instance, const rnti_t rnti)
{
return newGtpuDeleteAllTunnels(instance, rnti);
}
int newGtpuDeleteTunnels(instance_t instance, ue_id_t ue_id, int nbTunnels, pdusessionid_t *pdusession_id) {
LOG_D(GTPU, "[%ld] Start delete tunnels for ue id %lu\n",
instance, ue_id);
pthread_mutex_lock(&globGtp.gtp_lock);
getInstRetInt(compatInst(instance));
getUeRetInt(inst, ue_id);
int nb=0;
for (int i=0; i<nbTunnels; i++) {
auto ptr2=ptrUe->second.bearers.find(pdusession_id[i]);
if ( ptr2 == ptrUe->second.bearers.end() ) {
LOG_E(GTPU,"[%ld] GTP-U instance: delete of not existing tunnel UE ID:RAB: %ld/%x\n", instance, ue_id, pdusession_id[i]);
} else {
globGtp.te2ue_mapping.erase(ptr2->second.teid_incoming);
nb++;
}
}
if (ptrUe->second.bearers.size() == 0 )
// no tunnels on this ue id, erase the ue entry
inst->ue2te_mapping.erase(ptrUe);
pthread_mutex_unlock(&globGtp.gtp_lock);
LOG_I(GTPU, "[%ld] Deleted all tunnels for ue id %lu (%d tunnels deleted)\n", instance, ue_id, nb);
return !GTPNOK;
}
int gtpv1u_delete_x2u_tunnel( const instance_t instanceP,
const gtpv1u_enb_delete_tunnel_req_t *const req_pP) {
LOG_E(GTPU,"x2 tunnel not implemented\n");
return 0;
}
int gtpv1u_delete_ngu_tunnel( const instance_t instance,
gtpv1u_gnb_delete_tunnel_req_t *req) {
return newGtpuDeleteTunnels(instance, req->ue_id, req->num_pdusession, req->pdusession_id);
}
static int Gtpv1uHandleEchoReq(int h,
uint8_t *msgBuf,
uint32_t msgBufLen,
uint16_t peerPort,
uint32_t peerIp) {
Gtpv1uMsgHeaderT *msgHdr = (Gtpv1uMsgHeaderT *) msgBuf;
if ( msgHdr->version != 1 || msgHdr->PT != 1 ) {
LOG_E(GTPU, "[%d] Received a packet that is not GTP header\n", h);
return GTPNOK;
}
if ( msgHdr->S != 1 ) {
LOG_E(GTPU, "[%d] Received a echo request packet with no sequence number \n", h);
return GTPNOK;
}
uint16_t seq=ntohs(*(uint16_t *)(msgHdr+1));
LOG_D(GTPU, "[%d] Received a echo request, TEID: %d, seq: %hu\n", h, msgHdr->teid, seq);
uint8_t recovery[2]= {14,0};
return gtpv1uCreateAndSendMsg(h, peerIp, peerPort, GTP_ECHO_RSP, ntohl(msgHdr->teid), recovery, sizeof recovery, true, false, seq, 0, NO_MORE_EXT_HDRS, NULL, 0);
}
static int Gtpv1uHandleError(int h,
uint8_t *msgBuf,
uint32_t msgBufLen,
uint16_t peerPort,
uint32_t peerIp) {
LOG_E(GTPU, "Received GTP error indication (error handling is missing/not implemented)\n");
int rc = GTPNOK;
return rc;
}
static int Gtpv1uHandleSupportedExt(int h,
uint8_t *msgBuf,
uint32_t msgBufLen,
uint16_t peerPort,
uint32_t peerIp) {
LOG_E(GTPU,"Supported extensions to be dev\n");
int rc = GTPNOK;
return rc;
}
// When end marker arrives, we notify the client with buffer size = 0
// The client will likely call "delete tunnel"
// nevertheless we don't take the initiative
static int Gtpv1uHandleEndMarker(int h,
uint8_t *msgBuf,
uint32_t msgBufLen,
uint16_t peerPort,
uint32_t peerIp) {
Gtpv1uMsgHeaderT *msgHdr = (Gtpv1uMsgHeaderT *) msgBuf;
if ( msgHdr->version != 1 || msgHdr->PT != 1 ) {
LOG_E(GTPU, "[%d] Received a packet that is not GTP header\n", h);
return GTPNOK;
}
pthread_mutex_lock(&globGtp.gtp_lock);
// the socket Linux file handler is the instance id
getInstRetInt(h);
auto tunnel = globGtp.te2ue_mapping.find(ntohl(msgHdr->teid));
if (tunnel == globGtp.te2ue_mapping.end()) {
LOG_E(GTPU,"[%d] Received a incoming packet on unknown teid (%x) Dropping!\n", h, msgHdr->teid);
pthread_mutex_unlock(&globGtp.gtp_lock);
return GTPNOK;
}
// This context is not good for gtp
// frame, ... has no meaning
// manyother attributes may come from create tunnel
protocol_ctxt_t ctxt;
ctxt.module_id = 0;
ctxt.enb_flag = 1;
ctxt.instance = inst->addr.originInstance;
ctxt.rntiMaybeUEid = tunnel->second.ue_id;
ctxt.frame = 0;
ctxt.subframe = 0;
ctxt.eNB_index = 0;
ctxt.brOption = 0;
const srb_flag_t srb_flag=SRB_FLAG_NO;
const rb_id_t rb_id=tunnel->second.incoming_rb_id;
const mui_t mui=RLC_MUI_UNDEFINED;
const confirm_t confirm=RLC_SDU_CONFIRM_NO;
const pdcp_transmission_mode_t mode=PDCP_TRANSMISSION_MODE_DATA;
const uint32_t sourceL2Id=0;
const uint32_t destinationL2Id=0;
pthread_mutex_unlock(&globGtp.gtp_lock);
if ( !tunnel->second.callBack(&ctxt,
srb_flag,
rb_id,
mui,
confirm,
0,
NULL,
mode,
&sourceL2Id,
&destinationL2Id) )
LOG_E(GTPU,"[%d] down layer refused incoming packet\n", h);
LOG_D(GTPU,"[%d] Received END marker packet for: teid:%x\n", h, ntohl(msgHdr->teid));
return !GTPNOK;
}
static int Gtpv1uHandleGpdu(int h,
uint8_t *msgBuf,
uint32_t msgBufLen,
uint16_t peerPort,
uint32_t peerIp) {
Gtpv1uMsgHeaderT *msgHdr = (Gtpv1uMsgHeaderT *) msgBuf;
if ( msgHdr->version != 1 || msgHdr->PT != 1 ) {
LOG_E(GTPU, "[%d] Received a packet that is not GTP header\n", h);
return GTPNOK;
}
pthread_mutex_lock(&globGtp.gtp_lock);
// the socket Linux file handler is the instance id
getInstRetInt(h);
auto tunnel = globGtp.te2ue_mapping.find(ntohl(msgHdr->teid));
if (tunnel == globGtp.te2ue_mapping.end()) {
LOG_E(GTPU,"[%d] Received a incoming packet on unknown teid (%x) Dropping!\n", h, ntohl(msgHdr->teid));
pthread_mutex_unlock(&globGtp.gtp_lock);
return GTPNOK;
}
/* see TS 29.281 5.1 */
//Minimum length of GTP-U header if non of the optional fields are present
unsigned int offset = sizeof(Gtpv1uMsgHeaderT);
int8_t qfi = -1;
bool rqi = false;
uint32_t NR_PDCP_PDU_SN = 0;
/* if E, S, or PN is set then there are 4 more bytes of header */
if( msgHdr->E || msgHdr->S ||msgHdr->PN)
offset += 4;
if (msgHdr->E) {
int next_extension_header_type = msgBuf[offset - 1];
int extension_header_length;
while (next_extension_header_type != NO_MORE_EXT_HDRS) {
extension_header_length = msgBuf[offset];
switch (next_extension_header_type) {
case PDU_SESSION_CONTAINER: {
if (offset + sizeof(PDUSessionContainerT) > msgBufLen ) {
LOG_E(GTPU, "gtp-u received header is malformed, ignore gtp packet\n");
return GTPNOK;
}
PDUSessionContainerT *pdusession_cntr = (PDUSessionContainerT *)(msgBuf + offset + 1);
qfi = pdusession_cntr->QFI;
rqi = pdusession_cntr->Reflective_QoS_activation;
break;
}
case NR_RAN_CONTAINER: {
if (offset + 1 > msgBufLen ) {
LOG_E(GTPU, "gtp-u received header is malformed, ignore gtp packet\n");
return GTPNOK;
}
uint8_t PDU_type = (msgBuf[offset+1]>>4) & 0x0f;
if (PDU_type == 0){ //DL USER Data Format
int additional_offset = 6; //Additional offset capturing the first non-mandatory octet (TS 38.425, Figure 5.5.2.1-1)
if(msgBuf[offset+1]>>2 & 0x1){ //DL Discard Blocks flag is present
LOG_I(GTPU, "DL User Data: DL Discard Blocks handling not enabled\n");
additional_offset = additional_offset + 9; //For the moment ignore
}
if(msgBuf[offset+1]>>1 & 0x1){ //DL Flush flag is present
LOG_I(GTPU, "DL User Data: DL Flush handling not enabled\n");
additional_offset = additional_offset + 3; //For the moment ignore
}
if((msgBuf[offset+2]>>3)& 0x1){ //"Report delivered" enabled (TS 38.425, 5.4)
/*Store the NR PDCP PDU SN for which a delivery status report shall be generated once the
*PDU gets forwarded to the lower layers*/
//NR_PDCP_PDU_SN = msgBuf[offset+6] << 16 | msgBuf[offset+7] << 8 | msgBuf[offset+8];
NR_PDCP_PDU_SN = msgBuf[offset+additional_offset] << 16 | msgBuf[offset+additional_offset+1] << 8 | msgBuf[offset+additional_offset+2];
LOG_D(GTPU, " NR_PDCP_PDU_SN: %u \n", NR_PDCP_PDU_SN);
}
}
else{
LOG_W(GTPU, "NR-RAN container type: %d not supported \n", PDU_type);
}
break;
}
default:
LOG_W(GTPU, "unhandled extension 0x%2.2x, skipping\n", next_extension_header_type);
break;
}
offset += extension_header_length * EXT_HDR_LNTH_OCTET_UNITS;
if (offset > msgBufLen ) {
LOG_E(GTPU, "gtp-u received header is malformed, ignore gtp packet\n");
return GTPNOK;
}
next_extension_header_type = msgBuf[offset - 1];
}
}
// This context is not good for gtp
// frame, ... has no meaning
// manyother attributes may come from create tunnel
protocol_ctxt_t ctxt;
ctxt.module_id = 0;
ctxt.enb_flag = 1;
ctxt.instance = inst->addr.originInstance;
ctxt.rntiMaybeUEid = tunnel->second.ue_id;
ctxt.frame = 0;
ctxt.subframe = 0;
ctxt.eNB_index = 0;
ctxt.brOption = 0;
const srb_flag_t srb_flag=SRB_FLAG_NO;
const rb_id_t rb_id=tunnel->second.incoming_rb_id;
const mui_t mui=RLC_MUI_UNDEFINED;
const confirm_t confirm=RLC_SDU_CONFIRM_NO;
const sdu_size_t sdu_buffer_size = msgBufLen - offset;
unsigned char *const sdu_buffer=msgBuf+offset;
const pdcp_transmission_mode_t mode=PDCP_TRANSMISSION_MODE_DATA;
const uint32_t sourceL2Id=0;
const uint32_t destinationL2Id=0;
pthread_mutex_unlock(&globGtp.gtp_lock);
if (sdu_buffer_size > 0) {
if (qfi != -1 && tunnel->second.callBackSDAP) {
if ( !tunnel->second.callBackSDAP(&ctxt,
tunnel->second.ue_id,
srb_flag,
rb_id,
mui,
confirm,
sdu_buffer_size,
sdu_buffer,
mode,
&sourceL2Id,
&destinationL2Id,
qfi,
rqi,
tunnel->second.pdusession_id) )
LOG_E(GTPU,"[%d] down layer refused incoming packet\n", h);
} else {
if ( !tunnel->second.callBack(&ctxt,
srb_flag,
rb_id,
mui,
confirm,
sdu_buffer_size,
sdu_buffer,
mode,
&sourceL2Id,
&destinationL2Id) )
LOG_E(GTPU,"[%d] down layer refused incoming packet\n", h);
}
}
if(NR_PDCP_PDU_SN > 0 && NR_PDCP_PDU_SN %5 ==0){
LOG_D (GTPU, "Create and send DL DATA Delivery status for the previously received PDU, NR_PDCP_PDU_SN: %u \n", NR_PDCP_PDU_SN);
int rlc_tx_buffer_space = nr_rlc_get_available_tx_space(ctxt.rntiMaybeUEid, rb_id + 3);
LOG_D(GTPU, "Available buffer size in RLC for Tx: %d \n", rlc_tx_buffer_space);
/*Total size of DDD_status PDU = 1 octet to report extension header length
* size of mandatory part + 3 octets for highest transmitted/delivered PDCP SN
* 1 octet for padding + 1 octet for next extension header type,
* according to TS 38.425: Fig. 5.5.2.2-1 and section 5.5.3.24*/
extensionHeader_t *extensionHeader;
extensionHeader = (extensionHeader_t *) calloc(1, sizeof(extensionHeader_t)) ;
extensionHeader->buffer[0] = (1+sizeof(DlDataDeliveryStatus_flagsT)+3+1+1)/4;
DlDataDeliveryStatus_flagsT DlDataDeliveryStatus;
DlDataDeliveryStatus.deliveredPdcpSn = 0;
DlDataDeliveryStatus.transmittedPdcpSn= 1;
DlDataDeliveryStatus.pduType = 1;
DlDataDeliveryStatus.drbBufferSize = htonl(rlc_tx_buffer_space); //htonl(10000000); //hardcoded for now but normally we should extract it from RLC
memcpy(extensionHeader->buffer+1, &DlDataDeliveryStatus, sizeof(DlDataDeliveryStatus_flagsT));
uint8_t offset = sizeof(DlDataDeliveryStatus_flagsT)+1;
extensionHeader->buffer[offset] = (NR_PDCP_PDU_SN >> 16) & 0xff;
extensionHeader->buffer[offset+1] = (NR_PDCP_PDU_SN >> 8) & 0xff;
extensionHeader->buffer[offset+2] = NR_PDCP_PDU_SN & 0xff;
LOG_D(GTPU, "Octets reporting NR_PDCP_PDU_SN, extensionHeader-> %u:%u:%u \n",
extensionHeader->buffer[offset],
extensionHeader->buffer[offset+1],
extensionHeader->buffer[offset+2]);
extensionHeader->buffer[offset+3] = 0x00; //Padding octet
extensionHeader->buffer[offset+4] = 0x00; //No more extension headers
/*Total size of DDD_status PDU = size of mandatory part +
* 3 octets for highest transmitted/delivered PDCP SN +
* 1 octet for padding + 1 octet for next extension header type,
* according to TS 38.425: Fig. 5.5.2.2-1 and section 5.5.3.24*/
extensionHeader->length = 1+sizeof(DlDataDeliveryStatus_flagsT)+3+1+1;
gtpv1uCreateAndSendMsg(
h, peerIp, peerPort, GTP_GPDU, globGtp.te2ue_mapping[ntohl(msgHdr->teid)].outgoing_teid, NULL, 0, false, false, 0, 0, NR_RAN_CONTAINER, extensionHeader->buffer, extensionHeader->length);
}
LOG_D(GTPU,"[%d] Received a %d bytes packet for: teid:%x\n", h,
msgBufLen-offset,
ntohl(msgHdr->teid));
return !GTPNOK;
}
void gtpv1uReceiver(int h) {
uint8_t udpData[65536];
int udpDataLen;
socklen_t from_len;
struct sockaddr_in addr;
from_len = (socklen_t)sizeof(struct sockaddr_in);
if ((udpDataLen = recvfrom(h, udpData, sizeof(udpData), 0,
(struct sockaddr *)&addr, &from_len)) < 0) {
LOG_E(GTPU, "[%d] Recvfrom failed (%s)\n", h, strerror(errno));
return;
} else if (udpDataLen == 0) {
LOG_W(GTPU, "[%d] Recvfrom returned 0\n", h);
return;
} else {
if ( udpDataLen < (int)sizeof(Gtpv1uMsgHeaderT) ) {
LOG_W(GTPU, "[%d] received malformed gtp packet \n", h);
return;
}
Gtpv1uMsgHeaderT* msg=(Gtpv1uMsgHeaderT*) udpData;
if ( (int)(ntohs(msg->msgLength) + sizeof(Gtpv1uMsgHeaderT)) != udpDataLen ) {
LOG_W(GTPU, "[%d] received malformed gtp packet length\n", h);
return;
}
LOG_D(GTPU, "[%d] Received GTP data, msg type: %x\n", h, msg->msgType);
switch(msg->msgType) {
case GTP_ECHO_RSP:
break;
case GTP_ECHO_REQ:
Gtpv1uHandleEchoReq( h, udpData, udpDataLen, htons(addr.sin_port), addr.sin_addr.s_addr);
break;
case GTP_ERROR_INDICATION:
Gtpv1uHandleError( h, udpData, udpDataLen, htons(addr.sin_port), addr.sin_addr.s_addr);
break;
case GTP_SUPPORTED_EXTENSION_HEADER_INDICATION:
Gtpv1uHandleSupportedExt( h, udpData, udpDataLen, htons(addr.sin_port), addr.sin_addr.s_addr);
break;
case GTP_END_MARKER:
Gtpv1uHandleEndMarker( h, udpData, udpDataLen, htons(addr.sin_port), addr.sin_addr.s_addr);
break;
case GTP_GPDU:
Gtpv1uHandleGpdu( h, udpData, udpDataLen, htons(addr.sin_port), addr.sin_addr.s_addr);
break;
default:
LOG_E(GTPU, "[%d] Received a GTP packet of unknown type: %d\n", h, msg->msgType);
break;
}
}
}
#include <openair2/ENB_APP/enb_paramdef.h>
void *gtpv1uTask(void *args) {
while(1) {
/* Trying to fetch a message from the message queue.
If the queue is empty, this function will block till a
message is sent to the task.
*/
MessageDef *message_p = NULL;
itti_receive_msg(TASK_GTPV1_U, &message_p);
if (message_p != NULL ) {
openAddr_t addr= {{0}};
const instance_t myInstance = ITTI_MSG_DESTINATION_INSTANCE(message_p);
const int msgType = ITTI_MSG_ID(message_p);
LOG_D(GTPU, "GTP-U received %s for instance %ld\n", messages_info[msgType].name, myInstance);
switch (msgType) {
// DATA TO BE SENT TO UDP
case GTPV1U_DU_BUFFER_REPORT_REQ:{
gtpv1uSendDlDeliveryStatus(compatInst(myInstance), &GTPV1U_DU_BUFFER_REPORT_REQ(message_p));
}
break;
case TERMINATE_MESSAGE:
break;
case TIMER_HAS_EXPIRED:
LOG_E(GTPU, "Received unexpected timer expired (no need of timers in this version) %s\n", ITTI_MSG_NAME(message_p));
break;
case GTPV1U_ENB_END_MARKER_REQ:
gtpv1uEndTunnel(compatInst(myInstance), &GTPV1U_ENB_END_MARKER_REQ(message_p));
itti_free(TASK_GTPV1_U, GTPV1U_ENB_END_MARKER_REQ(message_p).buffer);
break;
case GTPV1U_ENB_DATA_FORWARDING_REQ:
case GTPV1U_ENB_DATA_FORWARDING_IND:
case GTPV1U_ENB_END_MARKER_IND:
LOG_E(GTPU, "to be developped %s\n", ITTI_MSG_NAME(message_p));
abort();
break;
case GTPV1U_REQ:
// to be dev: should be removed, to use API
strcpy(addr.originHost, GTPV1U_REQ(message_p).localAddrStr);
strcpy(addr.originService, GTPV1U_REQ(message_p).localPortStr);
strcpy(addr.destinationService,addr.originService);
AssertFatal((legacyInstanceMapping=gtpv1Init(addr))!=0,"Instance 0 reserved for legacy\n");
break;
default:
LOG_E(GTPU, "Received unexpected message %s\n", ITTI_MSG_NAME(message_p));
abort();
break;
}
AssertFatal(EXIT_SUCCESS==itti_free(TASK_GTPV1_U, message_p), "Failed to free memory!\n");
}
struct epoll_event events[20];
int nb_events = itti_get_events(TASK_GTPV1_U, events, 20);
for (int i = 0; i < nb_events; i++)
if ((events[i].events&EPOLLIN))
gtpv1uReceiver(events[i].data.fd);
}
return NULL;
}
#ifdef __cplusplus
}
#endif
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