fixeria
/
srsRAN
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Able to find eNB F-TEID from destination IP. Starting to add the GTP-U header to the packet.

This commit is contained in:
Pedro Alvarez 2017-12-07 15:06:24 +00:00
parent d18ff13d27
commit 2b7bd546bc
2 changed files with 54 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
srsepc/hdr/spgw/spgw.h
View File

@ -76,6 +76,8 @@ public:
void handle_create_session_request(struct srslte::gtpc_create_session_request *cs_req, struct srslte::gtpc_pdu *cs_resp_pdu);
void handle_modify_bearer_request(struct srslte::gtpc_pdu *mb_req_pdu, struct srslte::gtpc_pdu *mb_resp_pdu);
void handle_sgi_pdu(srslte::byte_buffer_t *msg);
private:
spgw();
@ -105,6 +107,7 @@ private:
sockaddr_in m_s1u_addr;
pthread_mutex_t m_mutex;
std::map<uint32_t,spgw_tunnel_ctx*> m_teid_to_tunnel_ctx; //Map control TEID to tunnel ctx. Usefull to get reply ctrl TEID, UE IP, etc.
std::map<in_addr_t,srslte::gtpc_f_teid_ie> m_ip_to_teid; //Map IP to User-plane TEID for downlink traffic

52
srsepc/src/spgw/spgw.cc
View File

@ -104,6 +104,9 @@ spgw::init(spgw_args_t* args, srslte::log_filter *spgw_log)
m_spgw_log->console("Could not initialize the S1-U interface.\n");
return -1;
}
//Init mutex
pthread_mutex_init(&m_mutex,NULL);
m_spgw_log->info("SP-GW Initialized.\n");
m_spgw_log->console("SP-GW Initialized.\n");
return 0;
@ -278,6 +281,7 @@ spgw::run_thread()
msg->N_bytes = read(sgi, msg->msg, SRSLTE_MAX_BUFFER_SIZE_BYTES);
//m_spgw_log->console("Received PDU from SGi. Bytes %d\n", msg->N_bytes);
//m_spgw_log->debug("Received PDU from SGi. Bytes %d\n", msg->N_bytes);
handle_sgi_pdu(msg);
}
}
else
@ -289,6 +293,48 @@ spgw::run_thread()
return;
}
void
spgw::handle_sgi_pdu(srslte::byte_buffer_t *msg)
{
uint8_t version=0;
uint32_t dest_ip;
struct in_addr dest_addr;
std::map<uint32_t,srslte::gtpc_f_teid_ie>::iterator gtp_fteid_it;
bool ip_found = false;
srslte::gtpc_f_teid_ie enb_fteid;
version = msg->msg[0]>>4;
((uint8_t*)&dest_ip)[0] = msg->msg[16];
((uint8_t*)&dest_ip)[1] = msg->msg[17];
((uint8_t*)&dest_ip)[2] = msg->msg[18];
((uint8_t*)&dest_ip)[3] = msg->msg[19];
dest_addr.s_addr = dest_ip;
m_spgw_log->console("IP version: %d\n", version);
m_spgw_log->console("Received packet to IP: %s\n", inet_ntoa(dest_addr));
pthread_mutex_lock(&m_mutex);
gtp_fteid_it = m_ip_to_teid.find(dest_ip);
if(gtp_fteid_it != m_ip_to_teid.end())
{
ip_found = true;
enb_fteid = gtp_fteid_it->second;
}
pthread_mutex_unlock(&m_mutex);
if(ip_found == false)
{
m_spgw_log->console("IP Packet is not for any UE\n");
return;
}
struct in_addr enb_addr;
enb_addr.s_addr = enb_fteid.ipv4;
m_spgw_log->console("UE F-TEID found, TEID 0x%x, eNB IP %s\n", enb_fteid.teid, inet_ntoa(enb_addr));
return;
}
uint64_t
spgw::get_new_ctrl_teid()
@ -400,7 +446,11 @@ spgw::handle_modify_bearer_request(struct srslte::gtpc_pdu *mb_req_pdu, struct s
struct in_addr addr3;
addr3.s_addr = tunnel_ctx->dw_user_fteid.ipv4;
m_spgw_log->info("eNB Rx User TEID 0x%x, eNB Rx User IP %s\n", tunnel_ctx->dw_user_fteid.teid, inet_ntoa(addr3));
//TODO!!!
//Setup IP to F-TEID map
pthread_mutex_lock(&m_mutex);
m_ip_to_teid.insert(std::pair<uint32_t,srslte::gtpc_f_teid_ie>(tunnel_ctx->ue_ipv4, tunnel_ctx->dw_user_fteid));
pthread_mutex_unlock(&m_mutex);
//Setting up Modify bearer response PDU
//Header