option.h

TCP option handling declarations.

uint32_t _option_build_mss(uint16_t mss)

Helper function to build the MSS option.

Parameters

mss:MSS value that should be set.

Return values

• MSS option value.

uint16_t _option_build_offset_control(uint16_t nopts, uint16_t ctl)

Helper function to build the combined option and control flag field.

Parameters

nopts:Number of options. ctl:Control flag field.

Return values

• Bitfield with encoded control bits and number of options.

int _option_parse(tcb.h::gnrc_tcp_tcb_t * tcb, tcp_hdr_t * hdr)

Parses options of a given TCP header.

Parameters

tcb:TCB holding the connection information. hdr:TCP header to be parsed.

Return values

• Zero on success. Negative value on error.