bpf -> usage

5 files changed, 0 insertions, 435 deletions

diff --git a/bpf/bpf_bpfel.go b/bpf/bpf_bpfel.go
deleted file mode 100644
index f4ffb76..0000000
--- a/bpf/bpf_bpfel.go
+++ /dev/null
@@ -1,125 +0,0 @@
-// Code generated by bpf2go; DO NOT EDIT.
-//go:build 386 || amd64 || arm || arm64 || loong64 || mips64le || mipsle || ppc64le || riscv64
-
-package bpf
-
-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/bpf/bpf_bpfel.o b/bpf/bpf_bpfel.o
deleted file mode 100644
index d9a44b4..0000000
--- a/bpf/bpf_bpfel.o
+++ /dev/null
diff --git a/bpf/bpf_usage.c b/bpf/bpf_usage.c
deleted file mode 100644
index 8b2343a..0000000
--- a/bpf/bpf_usage.c
+++ /dev/null
@@ -1,102 +0,0 @@
-#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, __u64);   // source mac 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, __u64);   // destination mac 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 __u64 nchar6_to_u64(unsigned char bytes[6])
-{
-	union {
-		char bytes[6];
-		__u64 i;
-	} ret;
-
-	ret.i = 0;
-#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
-	ret.bytes[0] = bytes[5];
-	ret.bytes[1] = bytes[4];
-	ret.bytes[2] = bytes[3];
-	ret.bytes[3] = bytes[2];
-	ret.bytes[4] = bytes[1];
-	ret.bytes[5] = bytes[0];
-#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
-	ret.bytes[0] = bytes[0];
-	ret.bytes[1] = bytes[1];
-	ret.bytes[2] = bytes[2];
-	ret.bytes[3] = bytes[3];
-	ret.bytes[4] = bytes[4];
-	ret.bytes[5] = bytes[5];
-#endif
-
-	return ret.i;
-}
-
-static __always_inline int update_usage(void *map, struct __sk_buff *skb,
-					update_usage_t traffic)
-{
-	__u64 mac, len, *usage;
-
-	void *data_end = (void *)(long)skb->data_end;
-	struct ethhdr *eth = (void *)(long)skb->data;
-
-	if ((void *) (eth + 1) > data_end)
-		return TCX_PASS;
-
-	if (skb->protocol != bpf_htons(ETH_P_IP) &&
-	    skb->protocol != bpf_htons(ETH_P_IPV6)) {
-		return TCX_PASS;
-	}
-
-	len = skb->len - sizeof(struct ethhdr);
-	if (traffic == UPDATE_USAGE_INGRESS) {
-		mac = nchar6_to_u64(eth->h_source);
-	} else {
-		mac = nchar6_to_u64(eth->h_dest);
-	}
-
-	usage = bpf_map_lookup_elem(map, &mac);
-	if (!usage) {
-		/* no entry in the map for this IP address yet. */
-		bpf_map_update_elem(map, &mac, &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/bpf/gen.go b/bpf/gen.go
deleted file mode 100644
index ff585db..0000000
--- a/bpf/gen.go
+++ /dev/null
@@ -1,3 +0,0 @@
-package bpf
-
-//go:generate go run github.com/cilium/ebpf/cmd/bpf2go -target bpfel bpf bpf_usage.c
diff --git a/bpf/main.go b/bpf/main.go
deleted file mode 100644
index d956a9b..0000000
--- a/bpf/main.go
+++ /dev/null
@@ -1,205 +0,0 @@
-package bpf
-
-import (
-	"context"
-	"errors"
-	"log"
-	"net"
-	"os"
-	"os/signal"
-	"syscall"
-	"time"
-
-	"github.com/cilium/ebpf"
-	"github.com/cilium/ebpf/link"
-	"github.com/jackc/pgx/v5/pgtype"
-	"sinanmohd.com/redq/db"
-)
-
-type UsageStat struct {
-	lastSeen         time.Time
-	lastDbPush       time.Time
-	bandwidthIngress uint64
-	bandwidthEgress  uint64
-	ingress          uint64
-	egress           uint64
-}
-type UsageMap map[uint64]UsageStat
-
-func Run(iface *net.Interface, queries *db.Queries, ctxDb context.Context) {
-	usageMap := make(UsageMap)
-
-	objs := bpfObjects{}
-	if err := loadBpfObjects(&objs, nil); err != nil {
-		log.Fatalf("loading objects: %s", err)
-	}
-	defer objs.Close()
-
-	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()
-
-	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()
-
-	bpfTicker := time.NewTicker(time.Second)
-	defer bpfTicker.Stop()
-	dbTicker := time.NewTicker(time.Minute)
-	defer dbTicker.Stop()
-	sigs := make(chan os.Signal, 1)
-	signal.Notify(sigs, os.Interrupt, os.Kill, syscall.SIGTERM)
-
-	for {
-		select {
-		case <-bpfTicker.C:
-			err := usageMap.update(objs.IngressIp4UsageMap, objs.EgressIp4UsageMap)
-			if err != nil {
-				log.Printf("updating usageMap: %s", err)
-			}
-		case <-sigs:
-			err := usageMap.updateDb(queries, ctxDb, false)
-			if err != nil {
-				log.Printf("updating Database: %s", err)
-			}
-			os.Exit(0)
-		case <-dbTicker.C:
-			err := usageMap.updateDb(queries, ctxDb, true)
-			if err != nil {
-				log.Printf("updating Database: %s", err)
-			}
-		}
-	}
-}
-
-func (usageStat UsageStat) expired(timeStart *time.Time) bool {
-	timeDiff := timeStart.Sub(usageStat.lastSeen)
-	if timeDiff > time.Minute {
-		return true
-	}
-
-	timeDiff = timeStart.Sub(usageStat.lastDbPush)
-	if timeDiff > time.Hour {
-		return true
-	}
-
-	return false
-}
-
-func (usageMap UsageMap) updateDb(queries *db.Queries, ctxDb context.Context, ifExpired bool) error {
-	timeStart := time.Now()
-
-	for key, value := range usageMap {
-		if ifExpired && !value.expired(&timeStart) {
-			continue
-		}
-
-		err := queries.EnterUsage(ctxDb, db.EnterUsageParams{
-			Hardwareaddr: int64(key),
-			Starttime: pgtype.Timestamp{
-				Time:  value.lastDbPush,
-				Valid: true,
-			},
-			Stoptime: pgtype.Timestamp{
-				Time:  value.lastSeen,
-				Valid: true,
-			},
-			Egress:  int64(value.egress),
-			Ingress: int64(value.ingress),
-		})
-		if err != nil {
-			return err
-		}
-
-		delete(usageMap, key)
-	}
-
-	return nil
-}
-
-func (usageMap UsageMap) update(ingress *ebpf.Map, egress *ebpf.Map) error {
-	timeStart := time.Now()
-	batchKeys := make([]uint64, 4096)
-	batchValues := make([]uint64, 4096)
-	var key uint64
-
-	cursor := ebpf.MapBatchCursor{}
-	for {
-		_, err := ingress.BatchLookupAndDelete(&cursor, batchKeys, batchValues, nil)
-		for i := range batchKeys {
-			/* TODO: maybe BatchLookupAndDelete is not the best idea with mostly empty map */
-			if batchValues[i] == 0 {
-				continue
-			}
-
-			key = batchKeys[i]
-			usage, ok := usageMap[key]
-			if ok {
-				usage.bandwidthIngress = batchValues[i] - usage.ingress
-				usage.ingress += batchValues[i]
-				usage.lastSeen = timeStart
-				usageMap[key] = usage
-			} else {
-				usageMap[key] = UsageStat{
-					bandwidthIngress: batchValues[i],
-					ingress:          batchValues[i],
-					lastDbPush:       timeStart,
-					lastSeen:         timeStart,
-				}
-			}
-		}
-
-		if errors.Is(err, ebpf.ErrKeyNotExist) {
-			break
-		} else if err != nil {
-			return err
-		}
-	}
-
-	cursor = ebpf.MapBatchCursor{}
-	for {
-		_, err := egress.BatchLookupAndDelete(&cursor, batchKeys, batchValues, nil)
-		for i := range batchKeys {
-			/* TODO: maybe BatchLookupAndDelete is not the best idea with mostly empty map */
-			if batchValues[i] == 0 {
-				continue
-			}
-
-			key = batchKeys[i]
-			usage, ok := usageMap[key]
-			if ok {
-				usage.bandwidthEgress = batchValues[i] - usage.egress
-				usage.egress += batchValues[i]
-				usage.lastSeen = timeStart
-				usageMap[key] = usage
-			} else {
-				usageMap[key] = UsageStat{
-					bandwidthEgress: batchValues[i],
-					egress:          batchValues[i],
-					lastDbPush:      timeStart,
-					lastSeen:        timeStart,
-				}
-			}
-		}
-
-		if errors.Is(err, ebpf.ErrKeyNotExist) {
-			break
-		} else if err != nil {
-			return err
-		}
-	}
-
-	return nil
-}