connection: Remember transport socket read resumption requests and replay them when re-enabling read. #13772

antoniovicente · 2020-10-27T03:36:40Z

Commit Message: connection: Remember transport socket read resumption requests and replay them when re-enabling read.
Additional Description: Fixes SslSocket read resumption after readDisable when processing the SSL record that contains the last bytes of the HTTP message
Risk Level: low
Testing: new unit and integration tests
Docs Changes: n/a
Release Notes: added
Platform Specific Features: n/a
Fixes #12304

…play them when re-enabling read. Signed-off-by: Antonio Vicente <[email protected]>

alyssawilk

Nice, I like this way better.
High level thought - do we want to runtime guard this just because it's high risk? Mild concerns about the complexity here opening up a spin loop bug.

alyssawilk · 2020-10-27T13:02:45Z

source/common/network/connection_impl.cc

@@ -554,6 +558,7 @@ void ConnectionImpl::onReadReady() {
    return;
  }

+  want_read_ = false;


should we also set this false for the early return onRead above? If not please comment.

Commented.

MockTransportConnectionImplTest.ResumeWhileAndAfterReadDisable covers the early return case which requires us to clear want_read_ just before doRead.

Sorry how is want_read_ cleared before onRead above? Maybe update the comment above also as to why we don't need to clear or how it's already cleared?

Added comment.

Signed-off-by: Antonio Vicente <[email protected]>

antoniovicente

Nice, I like this way better.
High level thought - do we want to runtime guard this just because it's high risk? Mild concerns about the complexity here opening up a spin loop bug.

Let's talk about the risk level of this PR. The case I'm adding resumption for is after a call to readDisable(false). That can happen when either:

High watermark trigger cleared from read buffer as bytes are drained
High watermark trigger cleared from write buffer as bytes are drained
Finished processing of an H1 request from the client

All of these count as proofs of work. It doesn't seem likely that the connection will continuously wake up when there's no available work.

If for instance we were to not clear want_read_ when we should, we'ld get a spurious wakeup on readDisable(false), but only once unless the connection is able to successfully read additional bytes from the socket and push them to the filter pipeline.

I agree that this PR increases complexity as it requires that the connection track additional state about the state of the transport and increases coupling between the connection and transport implementation.

I think the risk level of this PR is relatively low. That said, I have no objections to runtime guarding this change as an extra precaution.

Thanks for the prompt review.

antoniovicente · 2020-10-27T16:06:35Z

source/common/network/connection_impl.cc

@@ -554,6 +558,7 @@ void ConnectionImpl::onReadReady() {
    return;
  }

+  want_read_ = false;


Commented.

MockTransportConnectionImplTest.ResumeWhileAndAfterReadDisable covers the early return case which requires us to clear want_read_ just before doRead.

mattklein123

Thanks this is much better agreed! I haven't looked at the tests but the change looks like the right shape. Happy to take another pass once the comments are fleshed out a bit.

/wait

mattklein123 · 2020-10-27T17:17:59Z

source/common/network/connection_impl.cc

-      setReadBufferReady();
+      file_event_->activate(Event::FileReadyType::Read);


For clarity I might revert this change, even though it redundantly sets want_read_, but nbd either way. Up to you.

mattklein123 · 2020-10-27T17:20:07Z

source/common/network/connection_impl.cc

@@ -554,6 +558,7 @@ void ConnectionImpl::onReadReady() {
    return;
  }

+  want_read_ = false;


Sorry how is want_read_ cleared before onRead above? Maybe update the comment above also as to why we don't need to clear or how it's already cleared?

Signed-off-by: Antonio Vicente <[email protected]>

mattklein123

Thanks this LGTM modulo potential comment on naming. I will defer to @alyssawilk for final review. Thank you for iteration this is much cleaner!

mattklein123 · 2020-10-27T21:37:32Z

source/common/network/connection_impl.cc

-      // be read disabled. To handle these cases, fake an event to make sure the buffered data gets
-      // processed regardless and ensure that we dispatch it via onRead.
+    if ((consumerWantsToRead() && read_buffer_.length() > 0) ||
+        (read_disable_count_ == 0 && want_read_)) {


Sorry one other question from another look: is it possible to somehow fold all of this logic into consumerWantsToRead()? It seems kind of odd that we have a function that is tracking the consumer wants to read and then a different wants to read boolean. If it's too hard to merge them maybe some better names for both the function and the boolean?

Tried to improve on names and the if predicate.

Signed-off-by: Antonio Vicente <[email protected]>

…ant_read Signed-off-by: Antonio Vicente <[email protected]>

yanavlasov · 2020-10-28T02:33:09Z

The change looks good and I think is safe. My paranoid self tells me the flag protecting it is a good idea though. I think we just need to flag protect setting the transport_wants_read_ = true in the setReadBufferReady() method. Up to you though.

yanavlasov · 2020-10-28T02:34:06Z

test/common/network/connection_impl_test.cc

+  EXPECT_CALL(*file_event_, activate(Event::FileReadyType::Read));
+  connection_->readDisable(false);
+
+  // Do a read to clear the want_read_ flag, verify that no read activation is scheduled.


want_read_ -> transport_wants_read_ here and other places below.

Done. Nice catch.

Signed-off-by: Antonio Vicente <[email protected]>

mattklein123

Thanks LGTM with one small question.

mattklein123 · 2020-10-28T15:28:46Z

source/common/network/connection_impl.cc

+      // Sanity check: resumption with read_disable_count_ > 0 should only happen if the read
+      // buffer's high watermark has triggered.


Stupid question: why do we bother with this extra logic to read when the disable count is still 1 and high watermark triggered? Is the idea that we already have the data so we might as well flush it? If the high watermark triggered it's probably going to be stuck on the other side, so mostly just wondering if this extra logic is actually worth it.

This is part of the implementation of high-watermarks on the read buffer introduced in PR #11170

The parser is able to consume input from the read buffer, we just don't want to read additional bytes from the transport into the read buffer.

So the idea here is that we allow reading data out in the hope that it will get us below the low watermark? OK thanks that makes sense.

Yes.

The common scenario is when the H1 parser stops consuming bytes from the read buffer and calls readDisable(true) once it detects the end of the current request message. When request processing is complete, the H1 parser re-enables read. When H1 pipelining is in use, a full second request message could be in the read buffer and the read buffer may have triggered the high-watermark.

Make sense, though note that we don't do pipelining.

antoniovicente · 2020-10-28T16:10:57Z

/retest

repokitteh-read-only · 2020-10-28T16:11:01Z

Retrying Azure Pipelines:
Retried failed jobs in: envoy-presubmit

🐱

Caused by: a #13772 (comment) was created by @antoniovicente.

see: more, trace.

antoniovicente · 2020-10-28T18:00:45Z

/retest

giving macos one last chance.

repokitteh-read-only · 2020-10-28T18:00:50Z

Retrying Azure Pipelines:
Retried failed jobs in: envoy-presubmit

🐱

Caused by: a #13772 (comment) was created by @antoniovicente.

see: more, trace.

* master: (83 commits) tls: Typesafe tls slots (envoyproxy#13789) docs(example): Correct URL for caching example page (envoyproxy#13810) [fuzz] Made health check fuzz more efficient (envoyproxy#13747) rtds: properly scope rtds stats (envoyproxy#13764) http: fixing a bug with IPv6 hosts (envoyproxy#13798) connection: Remember transport socket read resumption requests and replay them when re-enabling read. (envoyproxy#13772) network: adding some accessors for ALPN work. (envoyproxy#13785) docs: added a step about how to handle platform specific extensions (envoyproxy#13759) Fix identation in ip transparency code snippet (envoyproxy#13743) wasm: enable WAVM's stack unwinding feature (envoyproxy#13792) log: set route name for direct response (envoyproxy#13683) Use nghttp2 as external dependsncy in protocol_constraints_lib (envoyproxy#13763) [Windows] Update windows dev docs (envoyproxy#13741) cel: patch thread safety issue (envoyproxy#13739) Windows: Fix ssl_socket_test (envoyproxy#13264) apple dns: add fake api test suite (envoyproxy#13780) overload: scale selected timers in response to load (envoyproxy#13475) examples: Add dynamic configuration (control plane) sandbox (envoyproxy#13746) Removed exception in getResponseStatus() (envoyproxy#13314) network: add timeout for transport connect (envoyproxy#13610) ... Signed-off-by: Michael Puncel <[email protected]>

PiotrSikora · 2020-11-03T08:37:56Z

/backport

(carried from the issue #12304)

PiotrSikora · 2020-11-03T08:41:05Z

@cpakulski anything with backport/review label needs to be evaluated for backporting and if approved, that label should be changed to backport/approved and PRs sent to stable releases.

…sts and replay them when re-enabling read. (envoyproxy#13772) Fixes SslSocket read resumption after readDisable when processing the SSL record that contains the last bytes of the HTTP message Signed-off-by: Antonio Vicente <[email protected]> Signed-off-by: antonio <[email protected]> Signed-off-by: Christoph Pakulski <[email protected]>

…on requests and replay them when re-enabling read. (#13772) (#14017) Fixes SslSocket read resumption after readDisable when processing the SSL record that contains the last bytes of the HTTP message Risk Level: low Testing: new unit and integration tests Docs Changes: n/a Release Notes: added Platform Specific Features: n/a Fixes #12304 Signed-off-by: Antonio Vicente <[email protected]> Signed-off-by: Christoph Pakulski <[email protected]>

…play them when re-enabling read. (envoyproxy#13772) Fixes SslSocket read resumption after readDisable when processing the SSL record that contains the last bytes of the HTTP message Signed-off-by: Antonio Vicente <[email protected]> Signed-off-by: antonio <[email protected]> Signed-off-by: Christoph Pakulski <[email protected]>

…play them when re-enabling read. (envoyproxy#13772) Fixes SslSocket read resumption after readDisable when processing the SSL record that contains the last bytes of the HTTP message Signed-off-by: Antonio Vicente <[email protected]>

…ion requests and replay them when re-enabling read. (#13772) (#14173) * connection: Remember transport socket read resumption requests and replay them when re-enabling read. (#13772) Fixes SslSocket read resumption after readDisable when processing the SSL record that contains the last bytes of the HTTP message Signed-off-by: Antonio Vicente <[email protected]>

…ion requests and replay them when re-enabling read. (envoyproxy#13772) (envoyproxy#14173) Fixes SslSocket read resumption after readDisable when processing the SSL record that contains the last bytes of the HTTP message Signed-off-by: Antonio Vicente <[email protected]>

…ion requests and replay them when re-enabling read. (#13772) (#14173) (#14254) Fixes SslSocket read resumption after readDisable when processing the SSL record that contains the last bytes of the HTTP message Signed-off-by: Antonio Vicente <[email protected]>

…ion requests and replay them when re-enabling read. (#13772) (#14173) (#14255) Fixes SslSocket read resumption after readDisable when processing the SSL record that contains the last bytes of the HTTP message Signed-off-by: Antonio Vicente <[email protected]>

cpakulski · 2020-12-16T20:33:24Z

Backported to releases 1.13, 1.14, 1.15 and 1.16. Removing backport/approved label.

* docs: kick-off 1.15.1 release. (envoyproxy#12166) Signed-off-by: Piotr Sikora <[email protected]> * tls: update BoringSSL-FIPS to 20190808. (envoyproxy#12170) Signed-off-by: Piotr Sikora <[email protected]> * test: Exclude wasm_vm_test from CI by making it a "manual" test. (#207) The wee v8 build times out in CI under --config=asan because the machine the job is scheduled on is too small. Signed-off-by: Antonio Vicente <[email protected]> * [v1.15] http: header map security fixes for duplicate headers (#197) (#200) Previously header matching did not match on all headers for non-inline headers. This patch changes the default behavior to always logically match on all headers. Multiple individual headers will be logically concatenated with ',' similar to what is done with inline headers. This makes the behavior effectively consistent. This behavior can be temporary reverted by setting the runtime value "envoy.reloadable_features.header_match_on_all_headers" to "false". Targeted fixes have been additionally performed on the following extensions which make them consider all duplicate headers by default as a comma concatenated list: 1) Any extension using CEL matching on headers. 2) The header to metadata filter. 3) The JWT filter. 4) The Lua filter. Like primary header matching used in routing, RBAC, etc. this behavior can be disabled by setting the runtime value "envoy.reloadable_features.header_match_on_all_headers" to false. Finally, the setCopy() header map API previously only set the first header in the case of duplicate non-inline headers. setCopy() now behaves similiarly to the other set*() APIs and replaces all found headers with a single value. This may have had security implications in the extauth filter which uses this API. This behavior can be disabled by setting the runtime value "envoy.reloadable_features.http_set_copy_replace_all_headers" to false. Fixes https://github.com/envoyproxy/envoy-setec/issues/188 Signed-off-by: Matt Klein <[email protected]> * backport to v1.15: Fix Kafka Repository Location (#223) Update mirror used to fetch kafka dependency to a valid, working mirror. Based on envoyproxy#13025 Resolves envoyproxy#13011 Signed-off-by: Antonio Vicente <[email protected]> * release: cutting 1.15.1 (#217) Signed-off-by: Antonio Vicente <[email protected]> * docs: Fix release notes for v1.15.1 release. (envoyproxy#13318) Signed-off-by: Antonio Vicente <[email protected]> * Backport flaky test and tsan fixes to releases/v1.15 branch (envoyproxy#13337) * hds: fix integration test flakes (envoyproxy#12214) Part of envoyproxy#12184 Signed-off-by: Matt Klein <[email protected]> Signed-off-by: Antonio Vicente <[email protected]> * Switch to a tsan-instrumented libc++ for tsan tests (envoyproxy#12134) This fixes envoyproxy#9784 and re-enables vhds_integration_test Risk Level: Low, but will most likely increase memory usage Signed-off-by: Dmitri Dolguikh <[email protected]> Signed-off-by: Antonio Vicente <[email protected]> * test: shard hds_integration_test (envoyproxy#12482) This should avoid TSAN timeout flakes. Signed-off-by: Matt Klein <[email protected]> Signed-off-by: Antonio Vicente <[email protected]> * test: shard http2_integration_test (envoyproxy#11939) This should mitigate TSAN timeout. Signed-off-by: Lizan Zhou <[email protected]> Signed-off-by: Antonio Vicente <[email protected]> * test: fix http2_integration_test flake (envoyproxy#12450) Fixes envoyproxy#12442 Signed-off-by: Matt Klein <[email protected]> Signed-off-by: Antonio Vicente <[email protected]> * Kick CI Signed-off-by: Antonio Vicente <[email protected]> Co-authored-by: Matt Klein <[email protected]> Co-authored-by: Dmitri Dolguikh <[email protected]> Co-authored-by: Lizan Zhou <[email protected]> * docs: kick off v1.15.3-dev (envoyproxy#13695) Signed-off-by: Christoph Pakulski <[email protected]> * 1.15: CI fixes backport (envoyproxy#13697) Backport following commits to 1.15: 748b2ab (mac ci: try ignoring update failure (envoyproxy#13658), 2020-10-20) f95f539 (ci: various improvements (envoyproxy#13660), 2020-10-20) 73d78f8 (ci: use multiple stage (envoyproxy#13557), 2020-10-15) b7a4756 (ci: use azp for api and go-control-plane sync (envoyproxy#13550), 2020-10-14) 876a6bb (ci use azp to sync filter example (envoyproxy#13501), 2020-10-12) a0f31ee (ci: use azp to generate docs (envoyproxy#13481), 2020-10-12) Signed-off-by: Lizan Zhou <[email protected]> Co-authored-by: asraa <[email protected]> * 1.15: fix CI script (envoyproxy#13724) Signed-off-by: Lizan Zhou <[email protected]> * Prevent SEGFAULT when disabling listener (envoyproxy#13515) (envoyproxy#13903) This prevents the stop_listening overload action from causing segmentation faults that can occur if the action is enabled after the listener has already shut down. Signed-off-by: Alex Konradi <[email protected]> Signed-off-by: Christoph Pakulski <[email protected]> * proxy protocol: set downstreamRemoteAddress on StreamInfo (envoyproxy#14131) (envoyproxy#14169) This fixes a regression which resulted in the downstreamRemoteAddress on the StreamInfo for a connection not having the address supplied by the proxy protocol filter, but instead having the address of the directly connected peer. This issue does not affect HTTP filters. Fixes envoyproxy#14087 Signed-off-by: Greg Greenway <[email protected]> Signed-off-by: Christoph Pakulski <[email protected]> * ci: temproray disable vhds_integration_test in TSAN (envoyproxy#12067) (envoyproxy#14217) Signed-off-by: Lizan Zhou <[email protected]> * tcmalloc changed and the data coming out of tcmalloc::MallocExtension::GetNumericProperty("generic.current_allocated_bytes") (envoyproxy#14165) Commit Message: tcmalloc changed and the data coming out of tcmalloc::MallocExtension::GetNumericProperty("generic.current_allocated_bytes") no longer appears to be deterministic, even in unthreaded tests. So disable exact mem checks till we sort that out Additional Description: Risk Level: low Testing: just thread_local_store_test Docs Changes: n/a Release Notes: n/a no longer appears to be deterministic, even in unthreaded tests. So disable exact mem checks till we sort that out Signed-off-by: Joshua Marantz <[email protected]> Signed-off-by: Christoph Pakulski <[email protected]> Co-authored-by: Joshua Marantz <[email protected]> * backport to v1.15: connection: Remember transport socket read resumption requests and replay them when re-enabling read. (envoyproxy#13772) (envoyproxy#14173) * connection: Remember transport socket read resumption requests and replay them when re-enabling read. (envoyproxy#13772) Fixes SslSocket read resumption after readDisable when processing the SSL record that contains the last bytes of the HTTP message Signed-off-by: Antonio Vicente <[email protected]> * backport to 1.15: udp: properly handle truncated/dropped datagrams (envoyproxy#14122) (envoyproxy#14166) Signed-off-by: Matt Klein <[email protected]> Signed-off-by: Christoph Pakulski <[email protected]> Co-authored-by: Matt Klein <[email protected]> Co-authored-by: Christoph Pakulski <[email protected]> * backport to 1.15: vrp: allow supervisord to open its log file (envoyproxy#14066) (envoyproxy#14280) Commit Message: Allow supervisord to open its log file Additional Description: Change the default location of the log file and give supervisord permissions to write to it. Risk Level: low Testing: built image locally Docs Changes: n/a Release Notes: n/a Platform Specific Features: n/a Signed-off-by: Alex Konradi <[email protected]> Signed-off-by: Christoph Pakulski <[email protected]> * rel 1.15: close release 1.15.3 (envoyproxy#14303) Signed-off-by: Christoph Pakulski <[email protected]> * Kick off rel 1.15.4. (envoyproxy#14323) Signed-off-by: Christoph Pakulski <[email protected]> * backport to 1.15: http: fix datadog and squash handling of responses without body (envoyproxy#13328) (envoyproxy#14458) Commit Message: Fixing bugs in datadog and sqaush where unexpected bodyless responses would crash Envoy Risk Level: low Testing: new unit tests, updated certs Docs Changes: n/a Release Notes: inline Signed-off-by: Christoph Pakulski <[email protected]> Co-authored-by: alyssawilk <[email protected]> * backport 1.15: http: fixing a bug with IPv6 hosts (envoyproxy#14273) Fixing a bug where HTTP parser offsets for IPv6 hosts did not include [] and Envoy assumed it did. This results in mis-parsing addresses for IPv6 CONNECT requests and IPv6 hosts in fully URLs over HTTP/1.1 Risk Level: low Testing: new unit, integration tests Docs Changes: n/a Release Notes: inline Signed-off-by: Shikugawa <[email protected]> Co-authored-by: alyssawilk <[email protected]> * backport to 1.15: tls: fix detection of the upstream connection close event. (envoyproxy#13858) (envoyproxy#14568) Fixes envoyproxy#13856. Signed-off-by: Piotr Sikora <[email protected]> Signed-off-by: Christoph Pakulski <[email protected]> Co-authored-by: Piotr Sikora <[email protected]> Co-authored-by: antonio <[email protected]> Co-authored-by: Matt Klein <[email protected]> Co-authored-by: Dmitri Dolguikh <[email protected]> Co-authored-by: Lizan Zhou <[email protected]> Co-authored-by: Christoph Pakulski <[email protected]> Co-authored-by: asraa <[email protected]> Co-authored-by: Joshua Marantz <[email protected]> Co-authored-by: Rei Shimizu <[email protected]> Co-authored-by: alyssawilk <[email protected]>

connection: Remember transport socket read resumption requests and re…

3d4555a

…play them when re-enabling read. Signed-off-by: Antonio Vicente <[email protected]>

antoniovicente requested a review from alyssawilk October 27, 2020 03:36

antoniovicente requested review from asraa, lizan and PiotrSikora as code owners October 27, 2020 03:36

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tls: fix SslSocket read resumption after readDisable when processing the SSL record that contains the last bytes of the HTTP message #13234

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Merge remote-tracking branch 'upstream/master' into connection_impl_w…

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[Level Events] manage level events registration mask #13787

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connection: skip read activate call when reading from transport socket if the connection is read disabled #14043

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shouldDrainReadBuffer followed up by readDisable(true) and readDisable(false) strange behaviour #12304

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connection: Remember transport socket read resumption requests and replay them when re-enabling read. #13772

connection: Remember transport socket read resumption requests and replay them when re-enabling read. #13772

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		setReadBufferReady();
		file_event_->activate(Event::FileReadyType::Read);

		// Sanity check: resumption with read_disable_count_ > 0 should only happen if the read
		// buffer's high watermark has triggered.

connection: Remember transport socket read resumption requests and replay them when re-enabling read. #13772

connection: Remember transport socket read resumption requests and replay them when re-enabling read. #13772

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