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Session Handling
45
Figure 7.2. Processing flow chart for rule-sets and session-rules
Packet arrives,
no m at ching session exist s
Exa mine next
rule-s et object
All rule-s ets
proces s ed?
No
Yes
No
Entry-
criteria
met?
Yes
All rules in
the rule-s et
proces s ed?
Exa mine next
rule object
"no-ma tch-
a ction" is
'continue'?
Yes
S es s ion
Allowed
Yes
"no-ma tch-
a ction" is
'a ccept'?
No
No
("no-ma tch-a ction" is 'drop' / 'reject')
/ 'ignore'
No
"a ction" is
'continue'?
Yes
"a ction" is
'drop' / 'reject'
/ 'ignore' ?
No
No ("a ction" is 'continue' or 'a ccept')
Rule
criteria
met?
Yes
S es s ion
Allowed
S es s ion
Allowed
P a cket
Dropped (*)
No
Yes
Yes
Rule P roces s ing
P roces s ing continues
with next rule-s et
Rule-S et P roces s ing
S ta rt proces s ing rules
within the rule-s et
No rules within the
rule-s et ma tched
Apply a ny cha nges
s pecified in the rule
(*) for "drop" a nd "reject", a s hort-lived 'drop' s es s ion is crea ted
P a cket
Dropped (*)
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