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Starting to add match methods to tft_packet_filter

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master
Pedro Alvarez 6 years ago committed by Andre Puschmann
parent 272e40a60d
commit e2ca02bbe4
3 changed files with 145 additions and 12 deletions
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23
srsue/hdr/stack/upper/tft_packet_filter.h
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@ -23,6 +23,7 @@
#define SRSUE_PACKET_FILTER_H
#include "srslte/asn1/liblte_mme.h"
#include "srslte/common/buffer_pool.h"
namespace srsue {
@ -54,8 +55,19 @@ const uint8_t SECURITY_PARAMETER_INDEX_TYPE = 0b01100000;
const uint8_t TYPE_OF_SERVICE_TYPE = 0b01110000;
const uint8_t FLOW_LABEL_TYPE = 0b10000000;
// Helper const
const uint8_t IPV4_ADDR_SIZE = 4;
const uint8_t IPV6_ADDR_SIZE = 16;
const uint8_t UDP_PROTOCOL = 0x11;
const uint8_t TCP_PROTOCOL = 0x06;
// TS 24.008 Table 10.5.162
struct tft_packet_filter_t {
class tft_packet_filter_t
{
public:
tft_packet_filter_t(const LIBLTE_MME_PACKET_FILTER_STRUCT& tft);
bool match(const srslte::unique_byte_buffer_t& pdu);
uint8_t id;
uint8_t eval_precedence;
uint16_t active_filters;
@ -71,12 +83,15 @@ struct tft_packet_filter_t {
uint16_t remote_port_range[2];
uint32_t security_parameter_index;
uint32_t type_of_service;
uint32_t flow_label;
uint8_t flow_label[3];
tft_packet_filter_t(const LIBLTE_MME_PACKET_FILTER_STRUCT& tft);
bool match_ip(const srslte::unique_byte_buffer_t& pdu);
bool match_protocol(const srslte::unique_byte_buffer_t& pdu);
bool match_type_of_service(const srslte::unique_byte_buffer_t& pdu);
bool match_flow_label(const srslte::unique_byte_buffer_t& pdu);
bool match_port(const srslte::unique_byte_buffer_t& pdu);
};
} // namespace srsue
#endif // SRSUE_GW_METRICS_H

2
srsue/src/stack/upper/gw.cc
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@ -359,7 +359,7 @@ void gw::run_thread()
uint8_t gw::check_tft_filter_match(const srslte::unique_byte_buffer_t& pdu) {
uint8_t lcid = DRB1_LCID;
uint8_t lcid = default_lcid;
if(!tft_filter_map.empty()){
for (std::pair<const uint16_t, tft_packet_filter_t>& filter_pair : tft_filter_map) {
bool match = filter_pair.second.match(pdu);

132
srsue/src/stack/upper/tft_packet_filter.cc
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@ -20,6 +20,8 @@
*/
#include "srsue/hdr/stack/upper/tft_packet_filter.h"
#include <linux/ip.h>
#include <linux/ipv6.h>
namespace srsue {
@ -31,6 +33,7 @@ tft_packet_filter_t::tft_packet_filter_t(const LIBLTE_MME_PACKET_FILTER_STRUCT&
int idx = 0;
while (idx < tft.filter_size) {
switch (tft.filter[idx]) {
// IPv4
case IPV4_REMOTE_ADDR_TYPE:
idx++;
active_filters = IPV4_REMOTE_ADDR_FLAG;
@ -43,18 +46,14 @@ tft_packet_filter_t::tft_packet_filter_t(const LIBLTE_MME_PACKET_FILTER_STRUCT&
memcpy(&ipv4_local_addr, &tft.filter[idx], 4);
idx += 4;
break;
//IPv6
case IPV6_REMOTE_ADDR_TYPE:
idx++;
active_filters = IPV6_REMOTE_ADDR_FLAG;
memcpy(&ipv4_local_addr, &tft.filter[idx], 16);
idx += 16;
break;
case IPV6_REMOTE_ADDR_LENGTH_TYPE:
break;
case IPV6_LOCAL_ADDR_LENGTH_TYPE:
break;
case PROTOCOL_ID_TYPE:
break;
// Ports
case SINGLE_LOCAL_PORT_TYPE:
idx++;
active_filters = SINGLE_LOCAL_PORT_FLAG;
@ -67,16 +66,135 @@ tft_packet_filter_t::tft_packet_filter_t(const LIBLTE_MME_PACKET_FILTER_STRUCT&
break;
case REMOTE_PORT_RANGE_TYPE:
break;
case SECURITY_PARAMETER_INDEX_TYPE:
// Protocol/Next Header
case PROTOCOL_ID_TYPE:
break;
// Type of service/Traffic class
case TYPE_OF_SERVICE_TYPE:
break;
//Flow label
case FLOW_LABEL_TYPE:
break;
// IPsec security parameter
case SECURITY_PARAMETER_INDEX_TYPE:
break;
default:
return;
}
}
}
bool tft_packet_filter_t::match(const srslte::unique_byte_buffer_t& pdu)
{
bool match = true;
struct iphdr* ip_pkt = (struct iphdr*)pdu->msg;
struct ipv6hdr* ip6_pkt = (struct ipv6hdr*)pdu->msg;
// Match IP Header to active filters
if (!match_ip(pdu)) {
return false;
}
// Check Protocol ID/Next Header Field
if (!match_protocol(pdu)) {
return false;
}
return true;
}
bool tft_packet_filter_t::match_ip(const srslte::unique_byte_buffer_t& pdu)
{
struct iphdr* ip_pkt = (struct iphdr*)pdu->msg;
struct ipv6hdr* ip6_pkt = (struct ipv6hdr*)pdu->msg;
if (ip_pkt->version == 4) {
// Check match on IPv4 packet
if (active_filters & IPV4_REMOTE_ADDR_TYPE) {
if (memcmp(&ipv4_remote_addr, &ip_pkt->daddr, IPV4_ADDR_SIZE) != 0) {
return false;
}
}
if (active_filters & IPV4_LOCAL_ADDR_TYPE) {
if (memcmp(&ipv4_local_addr, &ip_pkt->saddr, IPV4_ADDR_SIZE) != 0) {
return false;
}
}
} else if (ip_pkt->version == 6) {
// Check match on IPv6 (TODO)
} else {
// Error
return false;
}
return true;
}
bool tft_packet_filter_t::match_protocol(const srslte::unique_byte_buffer_t& pdu)
{
struct iphdr* ip_pkt = (struct iphdr*)pdu->msg;
struct ipv6hdr* ip6_pkt = (struct ipv6hdr*)pdu->msg;
if (active_filters & PROTOCOL_ID_TYPE) {
if (ip_pkt->version == 4) {
// Check match on IPv4 packet
if (ip_pkt->protocol != protocol_id) {
return false;
}
} else if (ip_pkt->version == 6) {
// Check match on IPv6 (TODO)
if (ip6_pkt->nexthdr != protocol_id) {
return false;
}
} else {
// Error
return false;
}
}
return true;
}
bool tft_packet_filter_t::match_type_of_service(const srslte::unique_byte_buffer_t& pdu)
{
struct iphdr* ip_pkt = (struct iphdr*)pdu->msg;
if (ip_pkt->version == 4 && (active_filters & TYPE_OF_SERVICE_FLAG)) {
// Check match on IPv4 packet
if (ip_pkt->tos != type_of_service) {
return false;
}
}
return true;
}
bool tft_packet_filter_t::match_flow_label(const srslte::unique_byte_buffer_t& pdu)
{
struct ipv6hdr* ip6_pkt = (struct ipv6hdr*)pdu->msg;
if (ip6_pkt->version == 6 && (active_filters & FLOW_LABEL_FLAG)) {
// Check match on IPv4 packet
if (memcmp(ip6_pkt->flow_lbl, flow_label, 3) != 0) {
return false;
}
}
return true;
}
bool tft_packet_filter_t::match_port(const srslte::unique_byte_buffer_t& pdu)
{
struct iphdr* ip_pkt = (struct iphdr*)pdu->msg;
struct ipv6hdr* ip6_pkt = (struct ipv6hdr*)pdu->msg;
if (ip_pkt->version == 4) {
switch (ip_pkt->protocol) {
case UDP_PROTOCOL:
printf("UDP protocol");
case TCP_PROTOCOL:
printf("TCP protocol");
default:
printf("Unhandled protocol");
return false;
}
}
return true;
}
} // namespace srsue

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