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45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
// Provides some very limited but fast packet filter mechanisms
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#ifndef PACKETFILTER_H
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#define PACKETFILTER_H
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#include "IP.h"
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#include "PrefixTable.h"
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class PacketFilter {
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public:
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PacketFilter(bool arg_default) { default_match = arg_default; }
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~PacketFilter() {}
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// Drops all packets from a particular source (which may be given
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// as an AddrVal or a SubnetVal) which hasn't any of TCP flags set
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// (TH_*) with the given probability (from 0..MAX_PROB).
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void AddSrc(addr_type src, uint32 tcp_flags, double probability);
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void AddSrc(Val* src, uint32 tcp_flags, double probability);
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void AddDst(addr_type src, uint32 tcp_flags, double probability);
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void AddDst(Val* src, uint32 tcp_flags, double probability);
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// Removes the filter entry for the given src/dst
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// Returns false if filter doesn not exist.
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bool RemoveSrc(addr_type src);
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bool RemoveSrc(Val* dst);
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bool RemoveDst(addr_type dst);
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bool RemoveDst(Val* dst);
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// Returns true if packet matches a drop filter
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bool Match(const IP_Hdr* ip, int len, int caplen);
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private:
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struct Filter {
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uint32 tcp_flags;
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uint32 probability;
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};
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bool MatchFilter(const Filter& f, const IP_Hdr& ip, int len, int caplen);
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bool default_match;
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PrefixTable src_filter;
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PrefixTable dst_filter;
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};
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#endif
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