Values used in TCP/IP headers

values.tc contains macros for common values in meta data and in TCP/IP header fields. The following groups of values are defined:

ETH_P_protocol

numbers of protocols above the link layer, e.g. ETH_P_IP

IPPROTO_protocol

transport layer protocol numbers, e.g. IPPROTO_UDP

TCPOPT_kind

type of TCP option

ICMP_type

ICMP message type, e.g. ICMP_TIMXCEED

ICMP_code

ICMP message type sub code, e.g. ICMP_TIMXCEED_INTRANS

IGMP_type

IGMP message type, e.g. IGMP_MEMBERSHIP_QUERY

The names are the same as used in BSD /usr/include/netinet/ include files. Please see values.tc for the complete list of definitions.

Examples:

... if meta_protocol == ETH_P_IP;
... if ip_proto == IPPROTO_TCP;
... if icmp_type == ICMP_UNREACH &&
      icmp_code == ICMP_UNREACH_PORT;
... if igmp_type == IGMP_V2_LEAVE_GROUP;

Note that values.tc is included via fields.tc and should not be included directly.