IP_OPTION_INFORMATION

A version of this page is also available for

Windows Embedded CE 6.0 R3

4/8/2010

This structure describes the options to be included in the header of an IP packet. The TTL, TOS, and Flags values are carried in specific fields in the header. The OptionsData bytes are carried in the options area following the standard IP header. With the exception of source route options, this data must be in the format to be transmitted on the wire as specified in RFC 791.

Syntax

typedef struct IP_OPTION_INFORMATION {
  unsigned char Ttl;
  unsigned char Tos;
  unsigned char Flags;
  unsigned char OptionsSize;
  unsigned char FAR* OptionsData;
} IP_OPTION_INFORMATION; 

Members

• Ttl
  String containing the Time-to-live.

• Tos
  String containing the type of service.

• Flags
  String containing IP header flag. The following table shows the flag value.

  Value	Description
  IP_FLAG_DF 0x2	Do not fragment this packet.

• OptionsSize
  Size, in bytes, of options data.

• OptionsData
  String containing supported IP option types. These types define the options that may be used in the OptionsData field of the IP_OPTION_INFORMATION structure. The following table shows the supported IP option types. For a complete description of each type, see RFC 791.

  Value	Description
  IP_OPT_EOL   0	End of list option
  IP_OPT_NOP   1	No operation
  IP_OPT_SECURITY   0x82	Security option
  IP_OPT_LSRR   0x83	Loose source route
  IP_OPT_SSRR   0x89	Strict source route
  IP_OPT_RR   0x7	Record route
  IP_OPT_TS   0x44	Timestamp
  IP_OPT_SID   0x88	Stream ID (obsolete)

Remarks

A source route option should contain the full route — first hop through final destination — in the route data. The first hop will be pulled out of the data and the option will be reformatted accordingly. Otherwise, the route option should be formatted as specified in RFC 791.

Requirements

See Also

Reference

ICMP Structures