TcpHeader Struct Reference

TCP header. More...

#include <mitigator_bpf.h>

Detailed Description

TCP header.

Access this header after checking transport protocol:

if (packet_transport_proto(ctx) == IP_PROTO_TCP) {
    struct TcpHeader* tcp = packet_transport_header(ctx);
    ...
}

Note

This function is for advanced users. Prefer packet_flow() to get ports. Prefer packet_transport_payload() to access payload and its length.

If you modify the fields of this header and return RESULT_PASS from the filter, call set_packet_mangled() to update checksums.

See also

https://en.wikipedia.org/wiki/Transmission_Control_Protocol#TCP_segment_structure

https://tools.ietf.org/html/rfc793

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The documentation for this struct was generated from the following file:

• mitigator_bpf.h