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84 Commits

Author SHA1 Message Date
Ondřej Kuzník
1f6d8611a3 Implement read throttling when writes backlog 
Reject operations in such a case with LDAP_BUSY. If read_event feature
is on, just stop reading from the connection. However this could still
result in deadlocks in reasonable situations. Need to figure out better
ways to make it safe and still protect ourselves.
 2020-11-17 17:58:15 +00:00
Ondřej Kuzník
68b163fca9 Introduce mutex checks 
Switched off unless thread debugging is on, but still useful for static
analysis.
 2020-11-17 17:58:15 +00:00
Ondřej Kuzník
62a806b243 Thread error checking 2020-11-17 17:58:15 +00:00
Ondřej Kuzník
1328777a85 Fix a SASL channel-binding leak 2020-11-17 17:58:15 +00:00
Ondřej Kuzník
58d66a3946 Fix race between unlinking a client and processing incoming data 2020-11-17 17:58:15 +00:00
Ondřej Kuzník
959ff07911 Make sure read event is not enabled while upstream_bind is scheduled 2020-11-17 17:58:15 +00:00
Ondřej Kuzník
dc1961cb15 Epoch based memory reclamation 
Similar to the algorithm presented in
https://www.cl.cam.ac.uk/techreports/UCAM-CL-TR-579.pdf

Not completely lock-free at the moment. Also the problems with epoch
based memory reclamation are still present - a thread actively observing
an epoch getting stuck will prevent LloadConnections and LloadOperations
being freed, potentially running out of memory.
 2020-11-17 17:58:15 +00:00
Ondřej Kuzník
4b3d21146b Introduce SASL support for upstream connections 2020-11-17 17:58:15 +00:00
Ondřej Kuzník
2a813cb06d Clean up backend_retry and its callers. 2020-11-17 17:58:15 +00:00
Ondřej Kuzník
b039e7c1b0 Keep a reference around for the bind task 2020-11-17 17:58:15 +00:00
Ondřej Kuzník
1ea5ee1f01 Do not unlock upstream without referencing its dying ops 2020-11-17 17:58:15 +00:00
Ondřej Kuzník
d954216f93 Change log level for unsolicited response 2020-11-17 17:58:14 +00:00
Ondřej Kuzník
7f22bac4ac Introduce a new connection status - gentle shutdown 2020-11-17 17:58:14 +00:00
Ondřej Kuzník
9bd90a741c Fix a race on bind response processing. 
During response processing, an upstream connection could be marked ready
after a different bind had already been allocated to it, thus allowing
two binds to be in progress on the same connection.
 2020-11-17 17:58:14 +00:00
Nadezhda Ivanova
2d33032504 Lload cn=monitor initial implementation 2020-11-17 17:58:14 +00:00
Ondřej Kuzník
7a69017f6f Resolve authzid after a successful auth 2020-11-17 17:58:14 +00:00
Ondřej Kuzník
cbc0ec04c0 Fix pinned operation forwarding 2020-11-17 17:58:14 +00:00
Ondřej Kuzník
5c1245de06 Manage c_sasl_bind_mech on upstream 2020-11-17 17:58:14 +00:00
Ondřej Kuzník
003a35c62f SASL bind support 
Introduces pinned operations. When SASL bind finishes, we might still
have to maintain a link between the client an an upstream for future
bind operations if we got a SASL Bind in Progress result code. We zero
out the msgids and remember a server-unique identifer on the client and
the relevant operation that lets us retrieve that link again. This
operation is reclaimed just like anything else when connections drop.

Hopefully, this should work for LDAP TXN and VC Exop support with SASL
later as well since it allows for many-to-many links to exist.
 2020-11-17 17:58:14 +00:00
Ondřej Kuzník
ddd1acc327 Passing the client directly will allow clearing it from op 2020-11-17 17:58:14 +00:00
Nadezhda Ivanova
8bc7650a7c Clean ups and renames to coexist with slapd 2020-11-17 17:58:14 +00:00
Ondřej Kuzník
c386d527ca Protect currently impossible branch 2020-11-17 17:58:14 +00:00
Ondřej Kuzník
1790018488 Record operation activity times 2020-11-17 17:58:14 +00:00
Ondřej Kuzník
a0ec50b33d Upstream queues ordered by c_connid 
In preparation for operation timeout events.
 2020-11-17 17:58:14 +00:00
Ondřej Kuzník
0cfd4fca4d Make timeouts common and redo connection read timeouts 2020-11-17 17:58:14 +00:00
Ondřej Kuzník
f87127dfa2 Set up TLS context for backends 2020-11-17 17:58:14 +00:00
Ondřej Kuzník
a0cd41ecd2 Upstream TLS support 2020-11-17 17:58:14 +00:00
Ondřej Kuzník
5ee4b67673 Move bind handling to bind.c 2020-11-17 17:58:14 +00:00
Ondřej Kuzník
b801ca17cb Rename macros and symbols to lloadd 2020-11-17 17:58:14 +00:00
Ondřej Kuzník
c60ef73984 Rework upstream conn setup 2020-11-17 17:58:13 +00:00
Ondřej Kuzník
8d93e0baa0 Unify connection locking and I/O 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
5fcef01d62 Switch from a global mutex 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
f7cf34e69c Reset connection state on abandon 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
6140cdf6f8 Handle a client connection disconnected from op 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
d4225924bc CLOSING is another potential state we could be in 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
622b87d5e8 Make ready only when still alive 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
7046444327 Do not read on the last iteration. 
When the pdu processing limit is hit, we still attempt to read another
PDU. If we succeed, the ber_get_next call in the read callback will
abort since a full PDU is already present.
 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
65def94380 More logging improvements 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
30e538e836 Realign logging levels. 
Stats now logs all operations, stats2 additionally intermediate messages
(search entries).
 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
1dd0e5131a Only one bind at a time 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
46fe014378 Make sure operation stays alive when we process it 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
0ff462b619 Fix issues in bind response handling 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
37cff37305 Manage connection refcnt better 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
05f2ac2583 Unify logging output 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
873d6fa3e1 Handle backend unsolicited response properly 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
961b600a42 Rework proxyauthz handling 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
6ee21f1181 Split bind configuration from backends 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
5b1ad43178 Handle upstream connection shutdown properly 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
a8a0fe26b0 Documentation updates 2020-11-17 17:55:46 +00:00
Ondřej Kuzník
495dfa69a2 Split client/upstream PDU size limits 2020-11-17 17:55:46 +00:00