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Support up to 3 parallel compact block txn fetchings

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A single outbound slot is required, so if the first two slots
are taken by inbound in-flights, the node will reject additional
unless they are coming from outbound.

This means in the case where a fast sybil peer is attempting to
stall out a node, a single high bandwidth outbound peer can
mitigate the attack.

Github-Pull: #27626
Rebased-From: 03423f8bd1
This commit is contained in:
Greg Sanders
2023-05-16 15:36:38 -04:00
committed by fanquake
parent d1a93f5d41
commit e66a5cbb56
4 changed files with 90 additions and 38 deletions
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2
src/net_processing.h
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@@ -22,6 +22,8 @@ static const bool DEFAULT_PEERBLOOMFILTERS = false;
static const bool DEFAULT_PEERBLOCKFILTERS = false;
/** Threshold for marking a node to be discouraged, e.g. disconnected and added to the discouragement filter. */
static const int DISCOURAGEMENT_THRESHOLD{100};
/** Maximum number of outstanding CMPCTBLOCK requests for the same block. */
static const unsigned int MAX_CMPCTBLOCKS_INFLIGHT_PER_BLOCK = 3;
struct CNodeStateStats {
int nSyncHeight = -1;