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TCP connections

tcp_incoming is non-zero if the packet is the SYN segment of an incoming TCP connection. Note that ``incoming'' is from the perspective of the classifier, i.e. tcp_incoming is non-zero if the connection is being set up in the same direction in which the current packet is traveling, as shown in figure 2.1.

Figure 2.1: Result of tcp_incoming.

The macro not_tcp_incoming is the negation of tcp_incoming.

Martin A. Brown 2003-11-06