thorpej e9c2ed11fe Add names for some ICMP and TCP protocol header offsets:
- icmptype (offset of ICMP type field)
	- icmpcode (offset of ICMP code field)
	- tcpflags (offset of TCP flags field)
and field values:
	- icmp-echoreply, icmp-unreach, icmp-sourcequench,
	  icmp-redirect, icmp-echo, icmp-routeradvert,
	  icmp-routersolicit, icmp-timxceed, icmp-paramprob,
	  icmp-tstamp, icmp-tstampreply, icmp-ireq, icmp-ireqreply,
	  icmp-maskreq, icmp-maskreply
	- tcp-fin, tcp-syn, tcp-rst, tcp-push, tcp-ack, tcp-urg

This allows expressions like the following:

	icmp[0] = 3
	(tcp[13] & 0x02) != 0

to be written as:

	icmp[icmptype] = icmp-unreach
	(tcp[tcpflags] & tcp-syn) != 0

which is a bit more user-friendly for e.g. writing packet filter rules.
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