diff options
Diffstat (limited to 'src/net.h')
| -rw-r--r-- | src/net.h | 26 |
1 files changed, 26 insertions, 0 deletions
@@ -1283,6 +1283,32 @@ struct NodeEvictionCandidate bool m_is_local; }; +/** + * Select an inbound peer to evict after filtering out (protecting) peers having + * distinct, difficult-to-forge characteristics. The protection logic picks out + * fixed numbers of desirable peers per various criteria, followed by ratios of + * desirable or disadvantaged peers. If any eviction candidates remain, the + * selection logic chooses a peer to evict. + */ [[nodiscard]] std::optional<NodeId> SelectNodeToEvict(std::vector<NodeEvictionCandidate>&& vEvictionCandidates); +/** Protect desirable or disadvantaged inbound peers from eviction by ratio. + * + * This function protects half of the peers which have been connected the + * longest, to replicate the non-eviction implicit behavior and preclude attacks + * that start later. + * + * Half of these protected spots (1/4 of the total) are reserved for localhost + * peers, if any, sorted by longest uptime, even if they're not longest uptime + * overall. + * + * This helps protect onion peers, which tend to be otherwise disadvantaged + * under our eviction criteria for their higher min ping times relative to IPv4 + * and IPv6 peers, and favorise the diversity of peer connections. + * + * This function was extracted from SelectNodeToEvict() to be able to test the + * ratio-based protection logic deterministically. + */ +void ProtectEvictionCandidatesByRatio(std::vector<NodeEvictionCandidate>& vEvictionCandidates); + #endif // BITCOIN_NET_H |