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srsRAN_4G
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Starting to add Bearer QoS parameter to create session request.

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master
Pedro Alvarez 6 years ago
parent 1b43c40422
commit 66db3deeb4
7 changed files with 125 additions and 100 deletions
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1
lib/include/srslte/interfaces/epc_interfaces.h
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@ -11,6 +11,7 @@ class hss_interface_s1ap
{
public:
virtual bool gen_auth_info_answer(uint64_t imsi, uint8_t *k_asme, uint8_t *autn, uint8_t *rand, uint8_t *xres) = 0;
virtual bool gen_update_loc_answer(uint64_t imsi, uint8_t *qci) = 0;
virtual bool resync_sqn(uint64_t imsi, uint8_t *auts) = 0;
};

2
srsepc/hdr/hss/hss.h
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@ -78,6 +78,8 @@ public:
void stop(void);
bool gen_auth_info_answer(uint64_t imsi, uint8_t *k_asme, uint8_t *autn, uint8_t *rand, uint8_t *xres);
bool gen_update_loc_answer(uint64_t imsi, uint8_t* qci);
bool resync_sqn(uint64_t imsi, uint8_t *auts);
private:

1
srsepc/hdr/mme/s1ap_common.h
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@ -128,6 +128,7 @@ typedef struct{
typedef struct{
enum erab_state state;
uint8_t erab_id;
uint8_t qci;
srslte::gtpc_f_teid_ie enb_fteid;
srslte::gtpc_f_teid_ie sgw_s1u_fteid;
srslte::gtpc_pdn_address_allocation_ie pdn_addr_alloc;

195
srsepc/src/hss/hss.cc
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@ -289,90 +289,8 @@ hss::gen_auth_info_answer(uint64_t imsi, uint8_t *k_asme, uint8_t *autn, uint8_t
}
bool
hss::resync_sqn(uint64_t imsi, uint8_t *auts)
{
bool ret = false;
switch (m_auth_algo)
{
case HSS_ALGO_XOR:
ret = resync_sqn_xor(imsi, auts);
break;
case HSS_ALGO_MILENAGE:
ret = resync_sqn_milenage(imsi, auts);
break;
}
increment_ue_sqn(imsi);
return ret;
}
bool
hss::resync_sqn_xor(uint64_t imsi, uint8_t *auts)
{
m_hss_log->error("XOR SQN synchronization not supported yet\n");
m_hss_log->console("XOR SQNs synchronization not supported yet\n");
return false;
}
bool
hss::resync_sqn_milenage(uint64_t imsi, uint8_t *auts)
{
uint8_t last_rand[16];
uint8_t ak[6];
uint8_t mac_s[8];
uint8_t sqn_ms_xor_ak[6];
uint8_t k[16];
uint8_t amf[2];
uint8_t opc[16];
uint8_t sqn[6];
if(!get_k_amf_opc_sqn(imsi, k, amf, opc, sqn))
{
return false;
}
get_last_rand(imsi, last_rand);
for(int i=0; i<6; i++){
sqn_ms_xor_ak[i] = auts[i];
}
for(int i=0; i<8; i++){
mac_s[i] = auts[i+6];
}
m_hss_log->debug_hex(k, 16, "User Key : ");
m_hss_log->debug_hex(opc, 16, "User OPc : ");
m_hss_log->debug_hex(last_rand, 16, "User Last Rand : ");
m_hss_log->debug_hex(auts, 16, "AUTS : ");
m_hss_log->debug_hex(sqn_ms_xor_ak, 6, "SQN xor AK : ");
m_hss_log->debug_hex(mac_s, 8, "MAC : ");
security_milenage_f5_star(k, opc, last_rand, ak);
m_hss_log->debug_hex(ak, 6, "Resynch AK : ");
uint8_t sqn_ms[6];
for(int i=0; i<6; i++){
sqn_ms[i] = sqn_ms_xor_ak[i] ^ ak[i];
}
m_hss_log->debug_hex(sqn_ms, 6, "SQN MS : ");
m_hss_log->debug_hex(sqn , 6, "SQN HE : ");
m_hss_log->debug_hex(amf, 2, "AMF : ");
uint8_t mac_s_tmp[8];
security_milenage_f1_star(k, opc, last_rand, sqn_ms, amf, mac_s_tmp);
m_hss_log->debug_hex(mac_s_tmp, 8, "MAC calc : ");
set_sqn(imsi, sqn_ms);
return true;
}
bool
hss::gen_auth_info_answer_milenage(uint64_t imsi, uint8_t *k_asme, uint8_t *autn, uint8_t *rand, uint8_t *xres)
{
@ -561,6 +479,23 @@ hss::gen_auth_info_answer_xor(uint64_t imsi, uint8_t *k_asme, uint8_t *autn, uin
return true;
}
bool
hss::gen_update_loc_answer(uint64_t imsi, uint8_t* qci)
{
std::map<uint64_t,hss_ue_ctx_t*>::iterator ue_ctx_it = m_imsi_to_ue_ctx.find(imsi);
if(ue_ctx_it == m_imsi_to_ue_ctx.end())
{
m_hss_log->info("User not found. IMSI: %015lu\n",imsi);
m_hss_log->console("User not found. IMSI: %015lu\n",imsi);
return false;
}
hss_ue_ctx_t *ue_ctx = ue_ctx_it->second;
m_hss_log->info("Found User %015lu\n",imsi);
*qci = ue_ctx->qci;
return true;
}
bool
hss::get_k_amf_opc_sqn(uint64_t imsi, uint8_t *k, uint8_t *amf, uint8_t *opc, uint8_t *sqn)
@ -583,6 +518,90 @@ hss::get_k_amf_opc_sqn(uint64_t imsi, uint8_t *k, uint8_t *amf, uint8_t *opc, ui
return true;
}
bool
hss::resync_sqn(uint64_t imsi, uint8_t *auts)
{
bool ret = false;
switch (m_auth_algo)
{
case HSS_ALGO_XOR:
ret = resync_sqn_xor(imsi, auts);
break;
case HSS_ALGO_MILENAGE:
ret = resync_sqn_milenage(imsi, auts);
break;
}
increment_ue_sqn(imsi);
return ret;
}
bool
hss::resync_sqn_xor(uint64_t imsi, uint8_t *auts)
{
m_hss_log->error("XOR SQN synchronization not supported yet\n");
m_hss_log->console("XOR SQNs synchronization not supported yet\n");
return false;
}
bool
hss::resync_sqn_milenage(uint64_t imsi, uint8_t *auts)
{
uint8_t last_rand[16];
uint8_t ak[6];
uint8_t mac_s[8];
uint8_t sqn_ms_xor_ak[6];
uint8_t k[16];
uint8_t amf[2];
uint8_t opc[16];
uint8_t sqn[6];
if(!get_k_amf_opc_sqn(imsi, k, amf, opc, sqn))
{
return false;
}
get_last_rand(imsi, last_rand);
for(int i=0; i<6; i++){
sqn_ms_xor_ak[i] = auts[i];
}
for(int i=0; i<8; i++){
mac_s[i] = auts[i+6];
}
m_hss_log->debug_hex(k, 16, "User Key : ");
m_hss_log->debug_hex(opc, 16, "User OPc : ");
m_hss_log->debug_hex(last_rand, 16, "User Last Rand : ");
m_hss_log->debug_hex(auts, 16, "AUTS : ");
m_hss_log->debug_hex(sqn_ms_xor_ak, 6, "SQN xor AK : ");
m_hss_log->debug_hex(mac_s, 8, "MAC : ");
security_milenage_f5_star(k, opc, last_rand, ak);
m_hss_log->debug_hex(ak, 6, "Resynch AK : ");
uint8_t sqn_ms[6];
for(int i=0; i<6; i++){
sqn_ms[i] = sqn_ms_xor_ak[i] ^ ak[i];
}
m_hss_log->debug_hex(sqn_ms, 6, "SQN MS : ");
m_hss_log->debug_hex(sqn , 6, "SQN HE : ");
m_hss_log->debug_hex(amf, 2, "AMF : ");
uint8_t mac_s_tmp[8];
security_milenage_f1_star(k, opc, last_rand, sqn_ms, amf, mac_s_tmp);
m_hss_log->debug_hex(mac_s_tmp, 8, "MAC calc : ");
set_sqn(imsi, sqn_ms);
return true;
}
void
hss::increment_ue_sqn(uint64_t imsi)
{
@ -615,6 +634,7 @@ hss::increment_sqn(uint8_t *sqn, uint8_t *next_sqn)
}
return;
}
void
hss::set_sqn(uint64_t imsi, uint8_t *sqn)
{
@ -715,15 +735,4 @@ hss::hex_string(uint8_t *hex, int size)
}
return ss.str();
}
/*
uint64_t
string_to_imsi()
{
uint64_t imsi = 0;
for(int i=0;i<=14;i++){
imsi += attach_req.eps_mobile_id.imsi[i]*std::pow(10,14-i);
}
return imsi;
}
*/
} //namespace srsepc

7
srsepc/src/mme/mme_gtpc.cc
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@ -92,7 +92,7 @@ mme_gtpc::get_new_ctrl_teid()
return m_next_ctrl_teid++; //FIXME Use a Id pool?
}
void
mme_gtpc::send_create_session_request(uint64_t imsi)
mme_gtpc::send_create_session_request(uint64_t imsi, uint8_t qci)
{
m_mme_gtpc_log->info("Sending Create Session Request.\n");
m_mme_gtpc_log->console("Sending Create Session Request.\n");
@ -124,9 +124,14 @@ mme_gtpc::send_create_session_request(uint64_t imsi)
// APN
strncpy(cs_req->apn, m_s1ap->m_s1ap_args.mme_apn.c_str(), sizeof(cs_req->apn)-1);
cs_req->apn[sizeof(cs_req->apn)-1] = 0;
// RAT Type
//cs_req->rat_type = srslte::GTPC_RAT_TYPE::EUTRAN;
//Bearer QoS
cs_req->eps_bearer_context_created.ebi = 5;
cs_req->eps_bearer_context_created.bearer_qos.qci=qci;
//Check whether this UE is already registed
std::map<uint64_t, struct gtpc_ctx>::iterator it = m_imsi_to_gtpc_ctx.find(imsi);
if(it != m_imsi_to_gtpc_ctx.end())

9
srsepc/src/mme/s1ap_nas_transport.cc
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@ -227,9 +227,8 @@ s1ap_nas_transport::handle_uplink_nas_transport(LIBLTE_S1AP_MESSAGE_UPLINKNASTRA
(msg_type == LIBLTE_MME_MSG_TYPE_AUTHENTICATION_FAILURE && sec_hdr_type == LIBLTE_MME_SECURITY_HDR_TYPE_INTEGRITY))
{
//Only identity response and authentication response are valid as plain NAS.
//Sometimes authentication response and identity are sent as integrity protected,
//Sometimes authentication response/failure and identity response are sent as integrity protected,
//but these messages are sent when the securty context is not setup yet, so we cannot integrity check it.
//FIXME Double-check
switch(msg_type)
{
case LIBLTE_MME_MSG_TYPE_IDENTITY_RESPONSE:
@ -1082,9 +1081,13 @@ s1ap_nas_transport::handle_nas_security_mode_complete(srslte::byte_buffer_t *nas
}
else
{
//Get subscriber info from HSS
uint8_t qci;
m_hss->gen_update_loc_answer(emm_ctx->imsi,&qci);
m_s1ap_log->console("QCI %d\n", qci);
//FIXME The packging of GTP-C messages is not ready.
//This means that GTP-U tunnels are created with function calls, as opposed to GTP-C.
m_mme_gtpc->send_create_session_request(emm_ctx->imsi);
m_mme_gtpc->send_create_session_request(emm_ctx->imsi,qci);
*reply_flag = false; //No reply needed
}
return true;

4
srsepc/src/spgw/spgw.cc
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@ -537,6 +537,10 @@ spgw::handle_create_session_request(struct srslte::gtpc_create_session_request *
cs_resp->eps_bearer_context_created.cause.cause_value = srslte::GTPC_CAUSE_VALUE_REQUEST_ACCEPTED;
cs_resp->eps_bearer_context_created.s1_u_sgw_f_teid_present=true;
cs_resp->eps_bearer_context_created.s1_u_sgw_f_teid = tunnel_ctx->up_user_fteid;
//Bearer QoS
cs_resp->eps_bearer_context_created.bearer_qos.qci = cs_req->eps_bearer_context_created.bearer_qos.qci;
//Fill in the PAA
cs_resp->paa_present = true;
cs_resp->paa.pdn_type = srslte::GTPC_PDN_TYPE_IPV4;

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