socket doesn't always have valid if_index so we can't use it as key (#153)

Signed-off-by: msherif1234 <mmahmoud@redhat.com>

bpf/dns_tracker.h

@@ -42,7 +42,6 @@ static inline void find_or_create_dns_flow(flow_id *id, struct dns_header *dns,
 
 static inline void fill_dns_id (flow_id *id, dns_flow_id *dns_flow, u16 dns_id, bool reverse) {
     dns_flow->id = dns_id;
-    dns_flow->if_index = id->if_index;
     dns_flow->protocol = id->transport_protocol;
     if (reverse) {
         __builtin_memcpy(dns_flow->src_ip, id->dst_ip, IP_MAX_LEN);

bpf/types.h

@@ -164,7 +164,6 @@ typedef struct dns_flow_id_t {
     u8 src_ip[IP_MAX_LEN];
     u8 dst_ip[IP_MAX_LEN];
     u16 id;
-    u32 if_index;
     u8 protocol;
 } __attribute__((packed)) dns_flow_id;
 

pkg/ebpf/bpf_bpfeb.go

@@ -19,7 +19,6 @@ type BpfDnsFlowId struct {
 	SrcIp    [16]uint8
 	DstIp    [16]uint8
 	Id       uint16
-	IfIndex  uint32
 	Protocol uint8
 }
 

pkg/ebpf/bpf_bpfel.go

@@ -19,7 +19,6 @@ type BpfDnsFlowId struct {
 	SrcIp    [16]uint8
 	DstIp    [16]uint8
 	Id       uint16
-	IfIndex  uint32
 	Protocol uint8
 }