qvalve

qvalve can predictably impair QUIC flows, by dropping, reordering or duplicating individual packets and sequences of packets. It is a non-transparent UDP proxy that should be interposed between a QUIC client and a QUIC server.

The behavior of qvalve is configured with rules specified in a simple language. Examples:

# drop the first three client initial pkts
> i1..3 drop

# drop the first server vneg pkt
< v1 drop

# duplicate the second server vneg pkt three times (= four copies sent)
< v2 dup 3

# reorder the first server handshake pkt (default: by one pkt)
< h1 reor

# nop does nothing
< h2 nop

More examples are in the tests directory and in https://github.com/NTAP/quant/tree/14/qvalve-tests.

See https://github.com/NTAP/quant/blob/14/bin/dtest.sh for an example for how to use this to automatically test a QUIC stack with docker containers (via the docker-compose config in https://github.com/NTAP/quant/blob/14/docker-compose.yml).

Copyright

Copyright (c) 2018-2019, NetApp, Inc. All rights reserved.

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Portions of this code are adapted from https://gist.github.com/vxgmichel/b2cf8536363275e735c231caef35a5df by Vincent Michel.

Copyright (c) 2017, Vincent Michel

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