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package filter
import (
"context"
"fmt"
"log"
"net"
"github.com/cilium/ebpf/link"
"sinanmohd.com/redq/db"
)
type Filter struct {
ctxDb context.Context
queries *db.Queries
objs bpfObjects
xdpLink link.Link
}
func Close(f *Filter) {
f.objs.Close()
f.xdpLink.Close()
}
func New(iface *net.Interface, queries *db.Queries, ctxDb context.Context) (*Filter, error) {
var err error
var f Filter
if err := loadBpfObjects(&f.objs, nil); err != nil {
log.Printf("loading objects: %s", err)
return nil, err
}
defer func() {
if err != nil {
f.objs.Close()
}
}()
f.xdpLink, err = link.AttachXDP(link.XDPOptions{
Interface: iface.Index,
Program: f.objs.MacFilter,
})
if err != nil {
log.Printf("could not attach TCx program: %s", err)
return nil, err
}
defer func() {
if err != nil {
f.xdpLink.Close()
}
}()
blackList, err := queries.GetMacBlackList(ctxDb)
zeros := make([]uint16, len(blackList))
_, err = f.objs.bpfMaps.MacBlacklistMap.BatchUpdate(blackList[:], zeros, nil)
if err != nil {
log.Printf("loading mac blacklist: %s", err)
return nil, err
}
f.queries = queries
return &f, nil
}
func (f *Filter) Block(mac uint64) error {
err := f.queries.EnterMacBlackList(f.ctxDb, int64(mac))
if err != nil {
log.Printf("adding mac blacklist: %s", err)
return err
}
err = f.objs.bpfMaps.MacBlacklistMap.Put(mac, true)
if err != nil {
log.Printf("adding mac blacklist: %s", err)
return err
}
return nil
}
func (f *Filter) Unblock(mac uint64) error {
err := f.queries.DeleteDnsBlackList(f.ctxDb, fmt.Sprintf("%v", mac))
if err != nil {
log.Printf("adding mac blacklist: %s", err)
return err
}
err = f.objs.bpfMaps.MacBlacklistMap.Delete(mac)
if err != nil {
log.Printf("adding mac blacklist: %s", err)
return err
}
return nil
}
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