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#define INET_CHECKSUM_INIT 0xffff
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extern uint16_t inet_checksum_calc(uint16_t, void *, size_t);
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extern int inet_pdu_encode(inet_packet_t *, size_t, size_t, void **,
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extern int inet_pdu_encode_ipv4(inet_packet_t *, size_t, size_t, void **,
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extern int inet_pdu_encode_ipv6(inet_packet_t *, size_t, void **,