eBPF: eBPF case-insensitive qname filtering

[thirdparty/pdns.git] / pdns / bpf-filter.hh

#pragma once
#include "config.h"

#include <mutex>

#include "iputils.hh"

#ifdef HAVE_EBPF

class BPFFilter
{
public:
  BPFFilter(uint32_t maxV4Addresses, uint32_t maxV6Addresses, uint32_t maxQNames);
  void addSocket(int sock);
  void block(const ComboAddress& addr);
  void block(const DNSName& qname, uint16_t qtype=255);
  void unblock(const ComboAddress& addr);
  void unblock(const DNSName& qname, uint16_t qtype=255);
  std::vector<std::pair<ComboAddress, uint64_t> > getAddrStats();
  std::vector<std::tuple<DNSName, uint16_t, uint64_t> > getQNameStats();
private:
  struct FDWrapper
  {
    ~FDWrapper()
    {
      if (fd != -1) {
        close(fd);
      }
    }
    int fd{-1};
  };
  std::mutex d_mutex;
  uint32_t d_maxV4;
  uint32_t d_maxV6;
  uint32_t d_maxQNames;
  uint32_t d_v4Count{0};
  uint32_t d_v6Count{0};
  uint32_t d_qNamesCount{0};
  FDWrapper d_v4map;
  FDWrapper d_v6map;
  FDWrapper d_qnamemap;
  FDWrapper d_filtermap;
  FDWrapper d_mainfilter;
  FDWrapper d_qnamefilter;
};

#endif /* HAVE_EBPF */