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authorsinanmohd <sinan@sinanmohd.com>2024-06-27 16:13:41 +0530
committersinanmohd <sinan@sinanmohd.com>2024-06-30 12:44:01 +0530
commite309091d17720b69c53172a41c0ea45ad7b66911 (patch)
tree166b05fb5dd7de7e0067ef0562567c4878c7050a /cmd
parentf3819a764bcac5a4959881795422c8e7b36cf398 (diff)
cmd/bpf: init
Diffstat (limited to 'cmd')
-rw-r--r--cmd/bpf/bpf_bpfel.go125
-rw-r--r--cmd/bpf/bpf_bpfel.obin0 -> 5312 bytes
-rw-r--r--cmd/bpf/bpf_usage.c73
-rw-r--r--cmd/bpf/gen.go3
-rw-r--r--cmd/bpf/main.go96
5 files changed, 297 insertions, 0 deletions
diff --git a/cmd/bpf/bpf_bpfel.go b/cmd/bpf/bpf_bpfel.go
new file mode 100644
index 0000000..1efd705
--- /dev/null
+++ b/cmd/bpf/bpf_bpfel.go
@@ -0,0 +1,125 @@
+// Code generated by bpf2go; DO NOT EDIT.
+//go:build 386 || amd64 || arm || arm64 || loong64 || mips64le || mipsle || ppc64le || riscv64
+
+package main
+
+import (
+ "bytes"
+ _ "embed"
+ "fmt"
+ "io"
+
+ "github.com/cilium/ebpf"
+)
+
+// loadBpf returns the embedded CollectionSpec for bpf.
+func loadBpf() (*ebpf.CollectionSpec, error) {
+ reader := bytes.NewReader(_BpfBytes)
+ spec, err := ebpf.LoadCollectionSpecFromReader(reader)
+ if err != nil {
+ return nil, fmt.Errorf("can't load bpf: %w", err)
+ }
+
+ return spec, err
+}
+
+// loadBpfObjects loads bpf and converts it into a struct.
+//
+// The following types are suitable as obj argument:
+//
+// *bpfObjects
+// *bpfPrograms
+// *bpfMaps
+//
+// See ebpf.CollectionSpec.LoadAndAssign documentation for details.
+func loadBpfObjects(obj interface{}, opts *ebpf.CollectionOptions) error {
+ spec, err := loadBpf()
+ if err != nil {
+ return err
+ }
+
+ return spec.LoadAndAssign(obj, opts)
+}
+
+// bpfSpecs contains maps and programs before they are loaded into the kernel.
+//
+// It can be passed ebpf.CollectionSpec.Assign.
+type bpfSpecs struct {
+ bpfProgramSpecs
+ bpfMapSpecs
+}
+
+// bpfSpecs contains programs before they are loaded into the kernel.
+//
+// It can be passed ebpf.CollectionSpec.Assign.
+type bpfProgramSpecs struct {
+ EgressFunc *ebpf.ProgramSpec `ebpf:"egress__func"`
+ IngressFunc *ebpf.ProgramSpec `ebpf:"ingress_func"`
+}
+
+// bpfMapSpecs contains maps before they are loaded into the kernel.
+//
+// It can be passed ebpf.CollectionSpec.Assign.
+type bpfMapSpecs struct {
+ EgressIp4UsageMap *ebpf.MapSpec `ebpf:"egress_ip4_usage_map"`
+ IngressIp4UsageMap *ebpf.MapSpec `ebpf:"ingress_ip4_usage_map"`
+}
+
+// bpfObjects contains all objects after they have been loaded into the kernel.
+//
+// It can be passed to loadBpfObjects or ebpf.CollectionSpec.LoadAndAssign.
+type bpfObjects struct {
+ bpfPrograms
+ bpfMaps
+}
+
+func (o *bpfObjects) Close() error {
+ return _BpfClose(
+ &o.bpfPrograms,
+ &o.bpfMaps,
+ )
+}
+
+// bpfMaps contains all maps after they have been loaded into the kernel.
+//
+// It can be passed to loadBpfObjects or ebpf.CollectionSpec.LoadAndAssign.
+type bpfMaps struct {
+ EgressIp4UsageMap *ebpf.Map `ebpf:"egress_ip4_usage_map"`
+ IngressIp4UsageMap *ebpf.Map `ebpf:"ingress_ip4_usage_map"`
+}
+
+func (m *bpfMaps) Close() error {
+ return _BpfClose(
+ m.EgressIp4UsageMap,
+ m.IngressIp4UsageMap,
+ )
+}
+
+// bpfPrograms contains all programs after they have been loaded into the kernel.
+//
+// It can be passed to loadBpfObjects or ebpf.CollectionSpec.LoadAndAssign.
+type bpfPrograms struct {
+ EgressFunc *ebpf.Program `ebpf:"egress__func"`
+ IngressFunc *ebpf.Program `ebpf:"ingress_func"`
+}
+
+func (p *bpfPrograms) Close() error {
+ return _BpfClose(
+ p.EgressFunc,
+ p.IngressFunc,
+ )
+}
+
+func _BpfClose(closers ...io.Closer) error {
+ for _, closer := range closers {
+ if err := closer.Close(); err != nil {
+ return err
+ }
+ }
+ return nil
+}
+
+// Do not access this directly.
+//
+//go:embed bpf_bpfel.o
+var _BpfBytes []byte
diff --git a/cmd/bpf/bpf_bpfel.o b/cmd/bpf/bpf_bpfel.o
new file mode 100644
index 0000000..789c00f
--- /dev/null
+++ b/cmd/bpf/bpf_bpfel.o
Binary files differ
diff --git a/cmd/bpf/bpf_usage.c b/cmd/bpf/bpf_usage.c
new file mode 100644
index 0000000..5e505da
--- /dev/null
+++ b/cmd/bpf/bpf_usage.c
@@ -0,0 +1,73 @@
+#include <linux/bpf.h>
+#include <linux/if_ether.h>
+#include <linux/ip.h>
+
+#include <bpf/bpf_endian.h>
+#include <bpf/bpf_helpers.h>
+
+#define MAX_MAP_ENTRIES 4096
+
+char __license[] SEC("license") = "GPL";
+
+struct {
+ __uint(type, BPF_MAP_TYPE_LRU_HASH);
+ __uint(max_entries, MAX_MAP_ENTRIES);
+ __type(key, __u32); // source IPv4 address
+ __type(value, __u64); // no of bytes
+} ingress_ip4_usage_map SEC(".maps");
+
+struct {
+ __uint(type, BPF_MAP_TYPE_LRU_HASH);
+ __uint(max_entries, MAX_MAP_ENTRIES);
+ __type(key, __u32); // destination IPv4 address
+ __type(value, __u64); // no of bytes
+} egress_ip4_usage_map SEC(".maps");
+
+typedef enum {
+ UPDATE_USAGE_INGRESS,
+ UPDATE_USAGE_EGRESS,
+} update_usage_t;
+
+static __always_inline int update_usage(void *map, struct __sk_buff *skb,
+ update_usage_t traffic)
+{
+ __u32 ip4;
+ __u64 len, *usage;
+
+ void *data_end = (void *)(long)skb->data_end;
+ void *data = (void *)(long)skb->data;
+ struct iphdr *ip = data + sizeof(struct ethhdr);
+
+ if (skb->protocol != bpf_htons(ETH_P_IP))
+ return TCX_PASS;
+ else if ((void *)(ip + 1) > data_end)
+ return TCX_PASS;
+
+ if (traffic == UPDATE_USAGE_INGRESS)
+ ip4 = ip->saddr;
+ else
+ ip4 = ip->daddr;
+ len = skb->len - sizeof(struct ethhdr);
+
+ usage = bpf_map_lookup_elem(map, &ip4);
+ if (!usage) {
+ /* no entry in the map for this IP address yet. */
+ bpf_map_update_elem(map, &ip4, &len, BPF_ANY);
+ } else {
+ __sync_fetch_and_add(usage, len);
+ }
+
+ return TCX_PASS;
+}
+
+SEC("tc")
+int ingress_func(struct __sk_buff *skb)
+{
+ return update_usage(&ingress_ip4_usage_map, skb, UPDATE_USAGE_INGRESS);
+}
+
+SEC("tc")
+int egress__func(struct __sk_buff *skb)
+{
+ return update_usage(&egress_ip4_usage_map, skb, UPDATE_USAGE_EGRESS);
+}
diff --git a/cmd/bpf/gen.go b/cmd/bpf/gen.go
new file mode 100644
index 0000000..c90c0a7
--- /dev/null
+++ b/cmd/bpf/gen.go
@@ -0,0 +1,3 @@
+package main
+
+//go:generate go run github.com/cilium/ebpf/cmd/bpf2go -target bpfel bpf bpf_usage.c
diff --git a/cmd/bpf/main.go b/cmd/bpf/main.go
new file mode 100644
index 0000000..5a5f842
--- /dev/null
+++ b/cmd/bpf/main.go
@@ -0,0 +1,96 @@
+package main
+
+import (
+ "fmt"
+ "log"
+ "net"
+ "net/netip"
+ "os"
+ "time"
+
+ "github.com/cilium/ebpf"
+ "github.com/cilium/ebpf/link"
+)
+
+type Usage struct {
+ ingress uint64
+ egress uint64
+}
+
+func main() {
+ if len(os.Args) < 2 {
+ log.Fatalf("Please specify a network interface")
+ }
+
+ ifaceName := os.Args[1]
+ iface, err := net.InterfaceByName(ifaceName)
+ if err != nil {
+ log.Fatalf("lookup network iface %q: %s", ifaceName, err)
+ }
+
+ // Load pre-compiled programs into the kernel.
+ objs := bpfObjects{}
+ if err := loadBpfObjects(&objs, nil); err != nil {
+ log.Fatalf("loading objects: %s", err)
+ }
+ defer objs.Close()
+
+ // Attach the program.
+ ingressLink, err := link.AttachTCX(link.TCXOptions{
+ Interface: iface.Index,
+ Program: objs.IngressFunc,
+ Attach: ebpf.AttachTCXIngress,
+ })
+ if err != nil {
+ log.Fatalf("could not attach TCx program: %s", err)
+ }
+ defer ingressLink.Close()
+
+ // Attach the program to Egress TC.
+ egressLink, err := link.AttachTCX(link.TCXOptions{
+ Interface: iface.Index,
+ Program: objs.EgressFunc,
+ Attach: ebpf.AttachTCXEgress,
+ })
+ if err != nil {
+ log.Fatalf("could not attach TCx program: %s", err)
+ }
+ defer egressLink.Close()
+
+ ticker := time.NewTicker(1 * time.Second)
+ defer ticker.Stop()
+ for range ticker.C {
+ prettyPrint(objs.IngressIp4UsageMap, objs.EgressIp4UsageMap)
+ }
+}
+
+func prettyPrint(ingress *ebpf.Map, egress *ebpf.Map) {
+ ipUsage := make(map[netip.Addr]Usage)
+ var key netip.Addr
+ var value uint64
+
+ iter := ingress.Iterate()
+ for iter.Next(&key, &value) {
+ ipUsage[key] = Usage {
+ ingress: value,
+ }
+ }
+
+ iter = egress.Iterate()
+ for iter.Next(&key, &value) {
+ usage, ok := ipUsage[key]
+ if (ok) {
+ usage.egress = value
+ } else {
+ usage = Usage { egress: value }
+ }
+
+ ipUsage[key] = usage
+ }
+
+ fmt.Print("\033[H\033[2J")
+ fmt.Printf("%15s\t%16s\t%16s\n", "ip", "down", "up")
+ for ip4, usage := range ipUsage {
+ fmt.Printf("%15s\t%16d\t%16d\n", ip4, usage.ingress, usage.egress)
+ }
+}