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2018-03-30acl-plugin: implement an optional session reclassification when ACL is ↵Andrew Yourtchenko1-1/+7
(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>
2018-03-22acl-plugin: implement ACL lookup contexts for "ACL as a service" use by ↵Andrew Yourtchenko1-3/+8
other plugins This code implements the functionality required for other plugins wishing to perform ACL lookups in the contexts of their choice, rather than only in the context of the interface in/out. The lookups are the stateless ACLs - there is no concept of "direction" within the context, hence no concept of "connection" either. The plugins need to include the The file acl_lookup_context.md has more info. Change-Id: I91ba97428cc92b24d1517e808dc2fd8e56ea2f8d Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>
2018-02-08acl-plugin: an elog-based tracing implementation for troubleshooting the ↵Andrew Yourtchenko1-0/+117
conn cleaner threads interactions This replaces some of the early-stage commented-out printf()s with an elog-based debug collector. It is aimed to be "better than nothing" initial implementation to be available in the field. It will be refined/updated based on use. This initial code is focused on the main/worker threads interactions, hence uses just the worker tracks. This code adds a developer debug CLI "set acl-plugin session table event-trace 1", which allows to gather the events pertaining to connection cleaning. The CLI is deliberately not part of the online help, as the express declaration that the semantics/trace levels, etc. are subject to change without notice. Change-Id: I3536309f737b73e50639cd5780822dcde667fc2c Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>
2017-12-20acl-plugin: add a debug CLI to print 5-tuple structure in human readable ↵Andrew Yourtchenko1-0/+1
format from hex representation Even though the trace now prints the hex as well as human readable format for acl plugin, it can be handy to have a separate function which allows to decode the hex. So add this debug CLI. Change-Id: I1db133a043374817ea9e94ae3736b8a98630669d Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>
2017-08-22acl-plugin: Recreate the bihash_40_8.h in the proper placeAndrew Yourtchenko1-1/+1
Change-Id: I30a3df53bc5fe5ab991a657918eb502bd2913440 Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>
2017-08-18acl-plugin: time out the sessions created by main thread too (VPP-948)Andrew Yourtchenko1-0/+4
In multithread setup the main thread may send packets, which may pass through the node with permit+reflect action. This creates the connection in lists for thread0, however in multithread there are no interupt handlers there. Ensure we are not spending too much time spinning in a tight cycle by suspending the main cleaner thread until the current iteration of interrupts is processed. Change-Id: Idb7346737757ee9a67b5d3e549bc9ad9aab22e89 Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com> (cherry picked from commit c1ff53f25d04ec1cc31844abd38014e91e398b5f)
2017-08-03acl-plugin: multicore: CSIT c100k 2-core stateful ACL test does not pass ↵Andrew Yourtchenko1-0/+3
(VPP-912) Fix several threading-related issues uncovered by the CSIT scale/performance test: - make the per-interface add/del counters per-thread - preallocate the per-worker session pools rather than attempting to resize them within the datapath - move the bihash initialization to the moment of ACL being applied rather than later during the connection creation - adjust the connection cleaning logic to not require the signaling from workers to main thread - make the connection lists check in the main thread robust against workers updating the list heads at the same time - add more information to "show acl-plugin sessions" to aid in debugging Change-Id: If82ef715e4993614df11db5e9afa7fa6b522d9bc Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com> (cherry picked from commit 8e4222fc7e23a478b021930ade3cb7d20938e398)
2017-06-19acl-plugin: bihash-based ACL lookupAndrew Yourtchenko1-1/+6
Add a bihash-based ACL lookup mechanism and make it a new default. This changes the time required to lookup a 5-tuple match from O(total_N_entries) to O(total_N_mask_types), where "mask type" is an overall mask on the 5-tuple required to represent an ACE. For testing/comparison there is a temporary debug CLI "set acl-plugin use-hash-acl-matching {0|1}", which, when set to 0, makes the plugin use the "old" linear lookup, and when set to 1, makes it use the hash-based lookup. Based on the discussions on vpp-dev mailing list, prevent assigning the ACL index to an interface, when the ACL with that index is not defined, also prevent deleting an ACL if that ACL is applied. Also, for the easier debugging of the state, there are new debug CLI commands to see the ACL plugin state at several layers: "show acl-plugin acl [index N]" - show a high-level ACL representation, used for the linear lookup and as a base for building the hashtable-based lookup. Also shows if a given ACL is applied somewhere. "show acl-plugin interface [sw_if_index N]" - show which interfaces have which ACL(s) applied. "show acl-plugin tables" - a lower-level debug command used to see the state of all of the related data structures at once. There are specifiers possible, which make for a more focused and maybe augmented output: "show acl-plugin tables acl [index N]" show the "bitmask-ready" representations of the ACLs, we well as the mask types and their associated indices. "show acl-plutin tables mask" show the derived mask types and their indices only. "show acl-plugin tables applied [sw_if_index N]" show the table of all of the ACEs applied for a given sw_if_index or all interfaces. "show acl-plugin tables hash [verbose N]" show the 48x8 bihash used for the ACL lookup. Change-Id: I89fff051424cb44bcb189e3cee04c1b8f76efc28 Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>
2017-06-15acl-plugin: store sessions in a single hash table instead of a per-interfaceAndrew Yourtchenko1-1/+1
A bihash-per-interface is convenient, but turns out tricky difficult from the maintenance standpoint with the large number of interfaces. This patch makes the sessions reside in a single hash table for all the interfaces, adding the lower 16 bit of sw_if_index as part of the key into the previously unused space. There is a tradeoff, that a session with an identical 5-tuple and the same sw_if_index modulo 65536 will match on either of the interfaces. The probability of that is deemed sufficiently small to not worry about it. In case it still happens before the heat death of the universe, there is a clib_warning and the colliding packet will be dropped, at which point we will need to bump the hash key size by another u64, but rather not pay the cost of doing that right now. Change-Id: I2747839cfcceda73e597cbcafbe1e377fb8f1889 Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>
2017-06-07acl-plugin: make the ACL plugin multicore-capableAndrew Yourtchenko1-8/+68
Add the logic to be able to use stateful ACLs in a multithreaded setup. Change-Id: I3b0cfa6ca4ea8f46f61648611c3e97b00c3376b6 Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>
2017-05-07Avoid active connection prevent timeout of idle conns after itAndrew Yourtchenko1-1/+2
Fix a logic error related to timing out of the connections following the active one. To avoid this class of issue in the future, create corresponding testcases, as well as some trivial sanity testcases for both IPv4 and IPv6. Since these tests are timing-dependent and take up time, mark them as extended tests. Change-Id: I2c72bad5efda7db8aa9cb05801fe47928dc47927 Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>
2017-04-06acl-plugin: make the IPv4/IPv6 non-first fragment handling in line with ACL ↵Andrew Yourtchenko1-3/+5
(VPP-682) This fixes the previously-implicit "drop all non-first fragments" behavior to be more in line with security rules: a non-first fragment is treated for the purposes of matching the ACL as a packet with the port match succeeding. This allows to change the behavior to permit the fragmented packets for the default "permit specific rules" ruleset, but also gives the flexibility to block the non-initial fragments by inserting into the begining a bogus rule which would deny the L4 traffic. Also, add a knob which allows to potentially turn this behavior off in case of a dire need (and revert to dropping all non-initial fragments), via a debug CLI. Change-Id: I546b372b65ff2157d9c68b1d32f9e644f1dd71b4 Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com> (cherry picked from commit 9fc0c26c6b28fd6c8b8142ea52f52eafa7e8c7ac)
2017-03-21ACL plugin 1.2Andrew Yourtchenko1-0/+99
L3 path support, L2+L3 unified processing node, skip IPv6 EH support. Change-Id: Iac37a466ba1c035e5c2997b03c0743bfec5c9a08 Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>