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authorAndrew Yourtchenko <ayourtch@gmail.com>2018-03-28 14:33:48 +0200
committerDamjan Marion <dmarion.lists@gmail.com>2018-03-30 20:48:01 +0000
commit17ddc0fee1bc20d0da84dd70bb579c8844a48ef4 (patch)
tree1b7444cfc8a6ff4fad13a5fed69d8503ae8cf7af /extras/libmemif/examples/icmp_responder-epoll
parent6091d230e3786c635eea3513d73af45081a5770c (diff)
acl-plugin: implement an optional session reclassification when ACL is (re-)applied
There were several discussions in which users would expect the sessions to be deleted if the new policy after the change does not permit them. There is no right or wrong answer to this question - it is a policy decision. This patch implements an idea to approach this. It uses a per-interface-per-direction counter to designate a "policy epoch" - a period of unchanging rulesets. The moment one removes or adds an ACL applied to an interface, this counter increments. The newly created connections inherit the current policy epoch in a given direction. Likewise, this counter increments if anyone updates an ACL applied to an interface. There is also a new (so far hidden) CLI "set acl-plugin reclassify-sessions [0|1]" (with default being 0) which allows to enable the checking of the existing sessions against the current policy epoch in a given direction. The session is not verified unless there is traffic hitting that session *in the direction of the policy creation* - if the epoch has changed, the session is deleted and within the same processing cycle is evaluated against the ACL rule base and recreated - thus, it should allow traffic-driven session state refresh without affecting the connectivity for the existing sessions. If the packet is coming in the direction opposite to which the session was initially created, the state adjustment is never done, because doing so generically is not really possible without diving too deep into the special cases, which may or may not work. Change-Id: I9e90426492d4bd474b5e89ea8dfb75a7c9de2646 Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>
Diffstat (limited to 'extras/libmemif/examples/icmp_responder-epoll')
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