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authorSuhas Daftuar <sdaftuar@gmail.com>2020-08-05 14:31:50 -0400
committerSuhas Daftuar <sdaftuar@gmail.com>2020-09-02 09:21:33 -0400
commit752e6ad5336d5af0db9fe16d24c0c6aa25b74a3f (patch)
tree517f0dbe10c38b3ed16e44a164cb2b8cfbe00bc0 /src/txmempool.cpp
parentc157a50694545090cb1c7e69123fe4709bd5a279 (diff)
Protect localhost and block-relay-only peers from eviction
Onion peers are disadvantaged under our eviction criteria, so prevent eventual eviction of them in the presence of contention for inbound slots by reserving some slots for localhost peers (sorted by longest uptime). Block-relay-only connections exist as a protection against eclipse attacks, by creating a path for block propagation that may be unknown to adversaries. Protect against inbound peer connection slot attacks from disconnecting such peers by attempting to protect up to 8 peers that are not relaying transactions but appear to be full-nodes, sorted by recency of last delivered block. Thanks to gmaxwell for suggesting these strategies.
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