On Thu, 21 Feb 2002, andre achternaam wrote:
> In the if statement ctinfo is checked for some conditions. The way they test
> the conditions tells me that the IP_CT_ESTABLISHED and IP_CT_IS_REPLY are
> bitmasks because they are added and they are part of an enumaration. When i
ctinfo doesn't store a bitmap. It is never set or checked in that way.
ctinfo stores a plain number, which encodes the (general) state of the
connection and the direction of the packet in question.
> enum ip_conntrack_info
> {
> /* Part of an established connection (either direction). */
> IP_CT_ESTABLISHED,
>
> /* Like NEW, but related to an existing connection, or ICMP error
> (in either direction). */
> IP_CT_RELATED,
>
> /* Started a new connection to track (only
> IP_CT_DIR_ORIGINAL); may be a retransmission. */
> IP_CT_NEW,
>
> /* >= this indicates reply direction */
> IP_CT_IS_REPLY,
>
> /* Number of distinct IP_CT types (no NEW in reply dirn). */
> IP_CT_NUMBER = IP_CT_IS_REPLY * 2 - 1
> };
The possible "states" are:
IP_CT_ESTABLISHED
IP_CT_RELATED
IP_CT_NEW
IP_CT_ESTABLISHED + IP_CT_IS_REPLY
IP_CT_RELATED + IP_CT_IS_REPLY
and therefore IP_CT_NUMBER = IP_CT_IS_REPLY * 2 - 1
Regards,
Jozsef
-
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