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add network initiated detach

This commit is contained in:
Andre Puschmann 2018-08-07 15:18:07 +02:00
parent 86f70011d6
commit 06c9a3f07f
2 changed files with 57 additions and 0 deletions
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2
srsue/hdr/upper/nas.h
View File

@ -173,6 +173,7 @@ private:
void parse_service_reject(uint32_t lcid, byte_buffer_t *pdu);
void parse_esm_information_request(uint32_t lcid, byte_buffer_t *pdu);
void parse_emm_information(uint32_t lcid, byte_buffer_t *pdu);
void parse_detach_request(uint32_t lcid, byte_buffer_t *pdu);
// Packet generators
void gen_attach_request(byte_buffer_t *msg);
@ -187,6 +188,7 @@ private:
void gen_pdn_connectivity_request(LIBLTE_BYTE_MSG_STRUCT *msg);
void send_security_mode_reject(uint8_t cause);
void send_detach_request(bool switch_off);
void send_detach_accept();
// security context persistence file
bool read_ctxt_file(nas_sec_ctxt *ctxt);

55
srsue/src/upper/nas.cc
View File

@ -371,6 +371,9 @@ void nas::write_pdu(uint32_t lcid, byte_buffer_t *pdu) {
case LIBLTE_MME_MSG_TYPE_EMM_INFORMATION:
parse_emm_information(lcid, pdu);
break;
case LIBLTE_MME_MSG_TYPE_DETACH_REQUEST:
parse_detach_request(lcid, pdu);
break;
default:
nas_log->error("Not handling NAS message with MSG_TYPE=%02X\n", msg_type);
pool->deallocate(pdu);
@ -975,6 +978,23 @@ void nas::parse_emm_information(uint32_t lcid, byte_buffer_t *pdu) {
pool->deallocate(pdu);
}
void nas::parse_detach_request(uint32_t lcid, byte_buffer_t *pdu)
{
LIBLTE_MME_DETACH_REQUEST_MSG_STRUCT detach_request;
liblte_mme_unpack_detach_request_msg((LIBLTE_BYTE_MSG_STRUCT *) pdu, &detach_request);
ctxt.rx_count++;
pool->deallocate(pdu);
if (state == EMM_STATE_REGISTERED) {
nas_log->info("Received Detach request (type=%d)\n", detach_request.detach_type.type_of_detach);
state = EMM_STATE_DEREGISTERED;
// send accept
send_detach_accept();
} else {
nas_log->warning("Received detach request in invalid state (state=%d)\n", state);
}
}
/*******************************************************************************
* Senders
******************************************************************************/
@ -1205,6 +1225,41 @@ void nas::send_detach_request(bool switch_off)
rrc->write_sdu(cfg.lcid, pdu);
}
void nas::send_detach_accept()
{
byte_buffer_t *pdu = pool_allocate_blocking;
if (!pdu) {
nas_log->error("Fatal Error: Couldn't allocate PDU in %s().\n", __FUNCTION__);
return;
}
LIBLTE_MME_DETACH_ACCEPT_MSG_STRUCT detach_accept;
bzero(&detach_accept, sizeof(detach_accept));
liblte_mme_pack_detach_accept_msg(&detach_accept,
LIBLTE_MME_SECURITY_HDR_TYPE_INTEGRITY,
ctxt.tx_count,
(LIBLTE_BYTE_MSG_STRUCT *) pdu);
// Add MAC
if (pdu->N_bytes > 5) {
integrity_generate(&k_nas_int[16],
ctxt.tx_count,
SECURITY_DIRECTION_UPLINK,
&pdu->msg[5],
pdu->N_bytes - 5,
&pdu->msg[1]);
} else {
nas_log->error("Invalid PDU size %d\n", pdu->N_bytes);
}
if(pcap != NULL) {
pcap->write_nas(pdu->msg, pdu->N_bytes);
}
nas_log->info("Sending detach accept\n");
rrc->write_sdu(cfg.lcid, pdu);
}
void nas::send_authentication_response(const uint8_t* res, const size_t res_len, const uint8_t sec_hdr_type) {
byte_buffer_t *pdu = pool_allocate_blocking;