From d69703f59313cac44a3ad53eaf6edb1809e12419 Mon Sep 17 00:00:00 2001
From: "Mohamed S. Mahmoud" <mmahmoud@redhat.com>
Date: Mon, 6 Nov 2023 17:54:50 -0500
Subject: [PATCH] dbg DNS over TCP NA fields (#218)
Signed-off-by: Mohamed Mahmoud <mmahmoud@redhat.com>
---
bpf/dns_tracker.h | 11 +++--
bpf/flows.c | 6 ++-
bpf/types.h | 1 +
pkg/decode/decode_protobuf.go | 2 +
pkg/decode/decode_protobuf_test.go | 16 ++++++-
pkg/ebpf/bpf_bpfeb.go | 1 +
pkg/ebpf/bpf_bpfeb.o | Bin 92752 -> 93000 bytes
pkg/ebpf/bpf_bpfel.go | 1 +
pkg/ebpf/bpf_bpfel.o | Bin 94504 -> 94760 bytes
pkg/exporter/proto.go | 2 +
pkg/flow/record.go | 4 ++
pkg/flow/record_test.go | 2 +
pkg/pbflow/flow.pb.go | 70 ++++++++++++++++-------------
proto/flow.proto | 1 +
14 files changed, 80 insertions(+), 37 deletions(-)
diff --git a/bpf/dns_tracker.h b/bpf/dns_tracker.h
index 57152695..9fd7a522 100644
--- a/bpf/dns_tracker.h
+++ b/bpf/dns_tracker.h
@@ -9,6 +9,7 @@
#define DNS_PORT 53
#define DNS_QR_FLAG 0x8000
#define UDP_MAXMSG 512
+#define EINVAL 22
struct dns_header {
u16 id;
@@ -64,21 +65,22 @@ static __always_inline u8 calc_dns_header_offset(pkt_info *pkt, void *data_end)
return len;
}
-static __always_inline void track_dns_packet(struct __sk_buff *skb, pkt_info *pkt) {
+static __always_inline int track_dns_packet(struct __sk_buff *skb, pkt_info *pkt) {
void *data_end = (void *)(long)skb->data_end;
if (pkt->id->dst_port == DNS_PORT || pkt->id->src_port == DNS_PORT) {
dns_flow_id dns_req;
u8 len = calc_dns_header_offset(pkt, data_end);
if (!len) {
- return;
+ return EINVAL;
}
struct dns_header dns;
+ int ret;
u32 dns_offset = (long)pkt->l4_hdr - (long)skb->data + len;
- if (bpf_skb_load_bytes(skb, dns_offset, &dns, sizeof(dns)) < 0) {
- return;
+ if ((ret = bpf_skb_load_bytes(skb, dns_offset, &dns, sizeof(dns))) < 0) {
+ return -ret;
}
u16 dns_id = bpf_ntohs(dns.id);
@@ -101,6 +103,7 @@ static __always_inline void track_dns_packet(struct __sk_buff *skb, pkt_info *pk
}
} // end of dns response
} // end of dns port check
+ return 0;
}
#endif // __DNS_TRACKER_H__
diff --git a/bpf/flows.c b/bpf/flows.c
index 219660e6..8e633a12 100644
--- a/bpf/flows.c
+++ b/bpf/flows.c
@@ -72,9 +72,9 @@ static inline int flow_monitor(struct __sk_buff *skb, u8 direction) {
// This is currently not to be enabled by default.
calculate_flow_rtt(&pkt, direction, data_end);
}
-
+ int dns_errno = 0;
if (enable_dns_tracking) {
- track_dns_packet(skb, &pkt);
+ dns_errno = track_dns_packet(skb, &pkt);
}
// TODO: we need to add spinlock here when we deprecate versions prior to 5.1, or provide
// a spinlocked alternative version and use it selectively https://lwn.net/Articles/779120/
@@ -97,6 +97,7 @@ static inline int flow_monitor(struct __sk_buff *skb, u8 direction) {
aggregate_flow->dns_record.id = pkt.dns_id;
aggregate_flow->dns_record.flags = pkt.dns_flags;
aggregate_flow->dns_record.latency = pkt.dns_latency;
+ aggregate_flow->dns_record.errno = dns_errno;
long ret = bpf_map_update_elem(&aggregated_flows, &id, aggregate_flow, BPF_ANY);
if (trace_messages && ret != 0) {
// usually error -16 (-EBUSY) is printed here.
@@ -119,6 +120,7 @@ static inline int flow_monitor(struct __sk_buff *skb, u8 direction) {
.dns_record.id = pkt.dns_id,
.dns_record.flags = pkt.dns_flags,
.dns_record.latency = pkt.dns_latency,
+ .dns_record.errno = dns_errno,
};
// even if we know that the entry is new, another CPU might be concurrently inserting a flow
diff --git a/bpf/types.h b/bpf/types.h
index f9790427..7d50bcc5 100644
--- a/bpf/types.h
+++ b/bpf/types.h
@@ -89,6 +89,7 @@ typedef struct flow_metrics_t {
u16 id;
u16 flags;
u64 latency;
+ u8 errno;
} __attribute__((packed)) dns_record;
u64 flow_rtt;
} __attribute__((packed)) flow_metrics;
diff --git a/pkg/decode/decode_protobuf.go b/pkg/decode/decode_protobuf.go
index e9179791..69465258 100644
--- a/pkg/decode/decode_protobuf.go
+++ b/pkg/decode/decode_protobuf.go
@@ -90,11 +90,13 @@ func PBFlowToMap(flow *pbflow.Record) config.GenericMap {
}
}
+ out["DnsErrno"] = flow.GetDnsErrno()
if flow.GetDnsId() != 0 {
out["DnsLatencyMs"] = flow.DnsLatency.AsDuration().Milliseconds()
out["DnsId"] = flow.GetDnsId()
out["DnsFlags"] = flow.GetDnsFlags()
out["DnsFlagsResponseCode"] = dnsRcodeToStr(flow.GetDnsFlags() & 0xF)
+ out["DnsErrno"] = uint32(0)
}
if flow.GetPktDropLatestDropCause() != 0 {
diff --git a/pkg/decode/decode_protobuf_test.go b/pkg/decode/decode_protobuf_test.go
index 717faae5..67a6cdf7 100644
--- a/pkg/decode/decode_protobuf_test.go
+++ b/pkg/decode/decode_protobuf_test.go
@@ -55,7 +55,8 @@ func TestDecodeProtobuf(t *testing.T) {
AgentIp: &pbflow.IP{
IpFamily: &pbflow.IP_Ipv4{Ipv4: 0x0a090807},
},
- Flags: 0x100,
+ Flags: 0x100,
+ DnsErrno: 0,
},
expected: &config.GenericMap{
"FlowDirection": 1,
@@ -76,6 +77,7 @@ func TestDecodeProtobuf(t *testing.T) {
"TimeFlowEndMs": someTime.UnixMilli(),
"Interface": "eth0",
"AgentIP": "10.9.8.7",
+ "DnsErrno": uint32(0),
},
},
{
@@ -109,6 +111,7 @@ func TestDecodeProtobuf(t *testing.T) {
AgentIp: &pbflow.IP{
IpFamily: &pbflow.IP_Ipv4{Ipv4: 0x0a090807},
},
+ DnsErrno: 0,
},
expected: &config.GenericMap{
"FlowDirection": 1,
@@ -128,6 +131,7 @@ func TestDecodeProtobuf(t *testing.T) {
"TimeFlowEndMs": someTime.UnixMilli(),
"Interface": "eth0",
"AgentIP": "10.9.8.7",
+ "DnsErrno": uint32(0),
},
},
{
@@ -161,6 +165,7 @@ func TestDecodeProtobuf(t *testing.T) {
},
IcmpType: 8,
IcmpCode: 0,
+ DnsErrno: 0,
},
expected: &config.GenericMap{
"FlowDirection": 1,
@@ -180,6 +185,7 @@ func TestDecodeProtobuf(t *testing.T) {
"AgentIP": "10.9.8.7",
"IcmpType": uint32(8),
"IcmpCode": uint32(0),
+ "DnsErrno": uint32(0),
},
},
{
@@ -213,6 +219,7 @@ func TestDecodeProtobuf(t *testing.T) {
},
IcmpType: 128,
IcmpCode: 0,
+ DnsErrno: 0,
},
expected: &config.GenericMap{
"FlowDirection": 1,
@@ -232,6 +239,7 @@ func TestDecodeProtobuf(t *testing.T) {
"AgentIP": "101:101:101:101:101:101:101:101",
"IcmpType": uint32(128),
"IcmpCode": uint32(0),
+ "DnsErrno": uint32(0),
},
},
{
@@ -264,6 +272,7 @@ func TestDecodeProtobuf(t *testing.T) {
AgentIp: &pbflow.IP{
IpFamily: &pbflow.IP_Ipv4{Ipv4: 0x0a090807},
},
+ DnsErrno: 0,
},
expected: &config.GenericMap{
"FlowDirection": 1,
@@ -277,6 +286,7 @@ func TestDecodeProtobuf(t *testing.T) {
"TimeFlowEndMs": someTime.UnixMilli(),
"Interface": "eth0",
"AgentIP": "10.9.8.7",
+ "DnsErrno": uint32(0),
},
},
{
@@ -319,6 +329,7 @@ func TestDecodeProtobuf(t *testing.T) {
DnsLatency: durationpb.New(someDuration),
DnsId: 1,
DnsFlags: 0x8001,
+ DnsErrno: 0,
TimeFlowRtt: durationpb.New(someDuration),
},
expected: &config.GenericMap{
@@ -349,6 +360,7 @@ func TestDecodeProtobuf(t *testing.T) {
"DnsId": uint32(1),
"DnsFlags": uint32(0x8001),
"DnsFlagsResponseCode": "FormErr",
+ "DnsErrno": uint32(0),
"TimeFlowRttNs": someDuration.Nanoseconds(),
},
},
@@ -407,6 +419,7 @@ func TestPBFlowToMap(t *testing.T) {
DnsLatency: durationpb.New(someDuration),
DnsId: 1,
DnsFlags: 0x80,
+ DnsErrno: 0,
TimeFlowRtt: durationpb.New(someDuration),
}
@@ -441,6 +454,7 @@ func TestPBFlowToMap(t *testing.T) {
"DnsId": uint32(1),
"DnsFlags": uint32(0x80),
"DnsFlagsResponseCode": "NoError",
+ "DnsErrno": uint32(0),
"TimeFlowRttNs": someDuration.Nanoseconds(),
}, out)
diff --git a/pkg/ebpf/bpf_bpfeb.go b/pkg/ebpf/bpf_bpfeb.go
index bb10a159..7f6ceebd 100644
--- a/pkg/ebpf/bpf_bpfeb.go
+++ b/pkg/ebpf/bpf_bpfeb.go
@@ -25,6 +25,7 @@ type BpfDnsRecordT struct {
Id uint16
Flags uint16
Latency uint64
+ Errno uint8
}
type BpfFlowId BpfFlowIdT
diff --git a/pkg/ebpf/bpf_bpfeb.o b/pkg/ebpf/bpf_bpfeb.o
index 12b4001b8b2cf7624ef8cbbdfb3d4375a891a48f..0af59e932379b347f41e3564b964d6d3cb0ded49 100644
GIT binary patch
delta 8769
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diff --git a/pkg/ebpf/bpf_bpfel.go b/pkg/ebpf/bpf_bpfel.go
index 8556d19a..0f869406 100644
--- a/pkg/ebpf/bpf_bpfel.go
+++ b/pkg/ebpf/bpf_bpfel.go
@@ -25,6 +25,7 @@ type BpfDnsRecordT struct {
Id uint16
Flags uint16
Latency uint64
+ Errno uint8
}
type BpfFlowId BpfFlowIdT
diff --git a/pkg/ebpf/bpf_bpfel.o b/pkg/ebpf/bpf_bpfel.o
index 5e001e1de72aa19a7028827941ae9dc6cfda9b3b..f938b3e4570b74b99c7b31e183abbd731f169f01 100644
GIT binary patch
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diff --git a/pkg/exporter/proto.go b/pkg/exporter/proto.go
index b8d47be2..800971dc 100644
--- a/pkg/exporter/proto.go
+++ b/pkg/exporter/proto.go
@@ -79,6 +79,7 @@ func v4FlowToPB(fr *flow.Record) *pbflow.Record {
PktDropLatestDropCause: fr.Metrics.PktDrops.LatestDropCause,
DnsId: uint32(fr.Metrics.DnsRecord.Id),
DnsFlags: uint32(fr.Metrics.DnsRecord.Flags),
+ DnsErrno: uint32(fr.Metrics.DnsRecord.Errno),
TimeFlowRtt: durationpb.New(fr.TimeFlowRtt),
}
if fr.Metrics.DnsRecord.Latency != 0 {
@@ -128,6 +129,7 @@ func v6FlowToPB(fr *flow.Record) *pbflow.Record {
PktDropLatestDropCause: fr.Metrics.PktDrops.LatestDropCause,
DnsId: uint32(fr.Metrics.DnsRecord.Id),
DnsFlags: uint32(fr.Metrics.DnsRecord.Flags),
+ DnsErrno: uint32(fr.Metrics.DnsRecord.Errno),
TimeFlowRtt: durationpb.New(fr.TimeFlowRtt),
}
if fr.Metrics.DnsRecord.Latency != 0 {
diff --git a/pkg/flow/record.go b/pkg/flow/record.go
index 54461c60..cd5b3c2b 100644
--- a/pkg/flow/record.go
+++ b/pkg/flow/record.go
@@ -115,6 +115,10 @@ func Accumulate(r *ebpf.BpfFlowMetrics, src *ebpf.BpfFlowMetrics) {
if src.Dscp != 0 {
r.Dscp = src.Dscp
}
+ // Accumulate DNSErrno
+ if src.DnsRecord.Errno != 0 {
+ r.DnsRecord.Errno = src.DnsRecord.Errno
+ }
}
// IP returns the net.IP equivalent object
diff --git a/pkg/flow/record_test.go b/pkg/flow/record_test.go
index 8709af0b..316bbe69 100644
--- a/pkg/flow/record_test.go
+++ b/pkg/flow/record_test.go
@@ -43,6 +43,7 @@ func TestRecordBinaryEncoding(t *testing.T) {
01, 00, // id
0x80, 00, // flags
0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, // latency
+ 0x00, // errno
// u64 flow_rtt
0xad, 0xde, 0xef, 0xbe, 0xef, 0xbe, 0xad, 0xde,
}))
@@ -82,6 +83,7 @@ func TestRecordBinaryEncoding(t *testing.T) {
Id: 0x0001,
Flags: 0x0080,
Latency: 0x1817161514131211,
+ Errno: 0,
},
FlowRtt: 0xdeadbeefbeefdead,
},
diff --git a/pkg/pbflow/flow.pb.go b/pkg/pbflow/flow.pb.go
index 16ad2116..a0ed4ddc 100644
--- a/pkg/pbflow/flow.pb.go
+++ b/pkg/pbflow/flow.pb.go
@@ -191,6 +191,7 @@ type Record struct {
DnsFlags uint32 `protobuf:"varint,22,opt,name=dns_flags,json=dnsFlags,proto3" json:"dns_flags,omitempty"`
DnsLatency *durationpb.Duration `protobuf:"bytes,23,opt,name=dns_latency,json=dnsLatency,proto3" json:"dns_latency,omitempty"`
TimeFlowRtt *durationpb.Duration `protobuf:"bytes,24,opt,name=time_flow_rtt,json=timeFlowRtt,proto3" json:"time_flow_rtt,omitempty"`
+ DnsErrno uint32 `protobuf:"varint,25,opt,name=dns_errno,json=dnsErrno,proto3" json:"dns_errno,omitempty"`
}
func (x *Record) Reset() {
@@ -393,6 +394,13 @@ func (x *Record) GetTimeFlowRtt() *durationpb.Duration {
return nil
}
+func (x *Record) GetDnsErrno() uint32 {
+ if x != nil {
+ return x.DnsErrno
+ }
+ return 0
+}
+
type DataLink struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
@@ -670,7 +678,7 @@ var file_proto_flow_proto_rawDesc = []byte{
0x07, 0x52, 0x65, 0x63, 0x6f, 0x72, 0x64, 0x73, 0x12, 0x28, 0x0a, 0x07, 0x65, 0x6e, 0x74, 0x72,
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0x0c, 0x65, 0x74, 0x68, 0x5f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x6f, 0x6c, 0x18, 0x01, 0x20,
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@@ -733,35 +741,37 @@ var file_proto_flow_proto_rawDesc = []byte{
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}
var (
diff --git a/proto/flow.proto b/proto/flow.proto
index 35803d7d..bf3209ca 100644
--- a/proto/flow.proto
+++ b/proto/flow.proto
@@ -53,6 +53,7 @@ message Record {
uint32 dns_flags = 22;
google.protobuf.Duration dns_latency = 23;
google.protobuf.Duration time_flow_rtt = 24;
+ uint32 dns_errno = 25;
}
message DataLink {
--
GitLab